Chemicals and DrugsAnalytical, Diagnostic and Therapeutic Techniques and EquipmentDisciplines and OccupationsTechnology, Industry, Agriculture
Silicon DioxideSiliconHafniumDielectric SpectroscopyNanomedicineSilicon CompoundsNanoparticlesCarbon DioxideCarbon Compounds, InorganicNitrogen DioxideNanowiresSulfur DioxideSemiconductorsOrganosilicon CompoundsNanotechnology
Silicon Dioxide
Transparent, tasteless crystals found in nature as agate, amethyst, chalcedony, cristobalite, flint, sand, QUARTZ, and tridymite. The compound is insoluble in water or acids except hydrofluoric acid.
Silicon
A trace element that constitutes about 27.6% of the earth's crust in the form of SILICON DIOXIDE. It does not occur free in nature. Silicon has the atomic symbol Si, atomic number 14, and atomic weight [28.084; 28.086].
Hafnium
Hafnium. A metal element of atomic number 72 and atomic weight 178.49, symbol Hf. (From Dorland, 28th ed)
Dielectric Spectroscopy
A technique of measuring the dielectric properties of materials, which vary over a range of frequencies depending on the physical properties of the material. The technique involves measuring, over a range of frequencies, ELECTRICAL IMPEDANCE and phase shift of an electric field as it passes through the material.
Nanomedicine
The branch of medicine concerned with the application of NANOTECHNOLOGY to the prevention and treatment of disease. It involves the monitoring, repair, construction, and control of human biological systems at the molecular level, using engineered nanodevices and NANOSTRUCTURES. (From Freitas Jr., Nanomedicine, vol 1, 1999).
Silicon Compounds
Inorganic compounds that contain silicon as an integral part of the molecule.
Nanoparticles
Nanometer-sized particles that are nanoscale in three dimensions. They include nanocrystaline materials; NANOCAPSULES; METAL NANOPARTICLES; DENDRIMERS, and QUANTUM DOTS. The uses of nanoparticles include DRUG DELIVERY SYSTEMS and cancer targeting and imaging.
Carbon Dioxide
A colorless, odorless gas that can be formed by the body and is necessary for the respiration cycle of plants and animals.
Carbon Compounds, Inorganic
Inorganic compounds that contain carbon as an integral part of the molecule but are not derived from hydrocarbons.
Nitrogen Dioxide
Nitrogen oxide (NO2). A highly poisonous gas. Exposure produces inflammation of lungs that may only cause slight pain or pass unnoticed, but resulting edema several days later may cause death. (From Merck, 11th ed) It is a major atmospheric pollutant that is able to absorb UV light that does not reach the earth's surface.
Nanowires
Nanometer-scale wires made of materials that conduct electricity. They can be coated with molecules such as antibodies that will bind to proteins and other substances.
Sulfur Dioxide
A highly toxic, colorless, nonflammable gas. It is used as a pharmaceutical aid and antioxidant. It is also an environmental air pollutant.
Semiconductors
Materials that have a limited and usually variable electrical conductivity. They are particularly useful for the production of solid-state electronic devices.
Organosilicon Compounds
Organic compounds that contain silicon as an integral part of the molecule.
Nanotechnology
The development and use of techniques to study physical phenomena and construct structures in the nanoscale size range or smaller.

Personal exposure to dust, endotoxin and crystalline silica in California agriculture. (1/2325)

AIMS: The aim of this study was to measure personal exposure to dust, endotoxin and crystalline silica during various agricultural operations in California over a period of one year. METHODS: Ten farms were randomly selected in Yolo and Solano counties and workers were invited to wear personal sampling equipment to measure inhalable and respirable dust levels during various operations. The samples were analysed for endotoxin using the Limulus Amebocyte Lysate assay and crystalline silica content using X-ray diffraction. In total 142 inhalable samples and 144 respirable samples were collected. RESULTS: The measurements showed considerable difference in exposure levels between various operations, in particular for the inhalable fraction of the dust and the endotoxin. Machine harvesting of tree crops (Geometric mean (GM) = 45.1 mg/m3) and vegetables (GM = 7.9 mg/m3), and cleaning of poultry houses (GM = 6.7 mg/m3) showed the highest inhalable dust levels. Cleaning of poultry houses also showed the highest inhalable endotoxin levels (GM = 1861 EU/m3). Respirable dust levels were generally low, except for machine harvesting of tree crops (GM = 2.8 mg/m3) and vegetables (GM = 0.9 mg/m3). Respirable endotoxin levels were also low. For the inhalable dust fraction, levels were reduced considerably when an enclosed cabin was present. The percentage of crystalline silica was overall higher in the respirable dust samples than the inhalable dust samples. CONCLUSIONS: Considerable differences exist in personal exposure levels to dust, endotoxin and crystalline silica during various agricultural operations in California agriculture with some operations showing very high levels.  (+info)

Purification and characterization of rat hippocampal CA3-dendritic spines associated with mossy fiber terminals. (2/2325)

We report a revised and improved isolation procedure for CA3-dendritic spines, most of them still in association with mossy fiber terminals resulting in a 7.5-fold enrichment over nuclei and a 29-fold enrichment over myelin. Additionally, red blood cells, medullated fibers, mitochondria and small synaptosomes were significantly depleted. We show by high resolution electron microscopy that this subcellular fraction contains numerous dendritic spines with a rich ultrastructure, e.g. an intact spine apparatus, membranous organelles, free and membrane-bound polyribosomes, endocytic structures and mitochondria. This improved experimental system will allow us to study aspects of post-synaptic functions at the biochemical and molecular level.  (+info)

Silica dust and lung cancer in the German stone, quarrying, and ceramics industries: results of a case-control study. (3/2325)

BACKGROUND: A work force based case-control study of lung cancer was performed in non-silicotic subjects exposed to crystalline silica to investigate the association between silica dust and lung cancer excluding the influence of silicosis. METHODS: Two hundred and forty seven patients with lung cancer and 795 control subjects were enrolled, all of whom had been employed in the German stone, quarrying, or ceramics industries. Smoking was used as a matching criterion. Exposure to silica was quantified by measurements, if available, or otherwise by industrial hygienists. Several indices (peak, average and cumulative exposure) were used to analyse the relationship between the level of exposure and risk of lung cancer as odds ratios (OR). RESULTS: The risk of lung cancer is associated with the year of and age at first exposure to silica, duration of exposure, and latency. All odds ratios were adjusted for these factors. Considering the peak exposure, the OR for workers exposed to high levels (>/=0.15 mg/m3 respirable silica dust which is the current occupational threshold value for Germany) compared with those exposed to low levels (<0.15 mg/m3) was 0.85 (95% CI 0.58 to 1. 25). For the time weighted average exposure the OR was 0.91 (95% CI 0.57 to 1.46). The OR for the cumulative exposure was 1.02 (95% CI 0. 67 to 1.55). No increase in risk was evident with increasing exposure. CONCLUSIONS: This study shows no association between exposure to crystalline silica and lung cancer. The exclusion of subjects with silicosis may have led to dilution with respect to the level of exposure and therefore reduced the power to detect a small risk. Alternatively, the risk of getting lung cancer may be restricted to subjects with silicosis and is not directly linked to silica dust.  (+info)

Biochemical evolution III: polymerization on organophilic silica-rich surfaces, crystal-chemical modeling, formation of first cells, and geological clues. (4/2325)

Catalysis at organophilic silica-rich surfaces of zeolites and feldspars might generate replicating biopolymers from simple chemicals supplied by meteorites, volcanic gases, and other geological sources. Crystal-chemical modeling yielded packings for amino acids neatly encapsulated in 10-ring channels of the molecular sieve silicalite-ZSM-5-(mutinaite). Calculation of binding and activation energies for catalytic assembly into polymers is progressing for a chemical composition with one catalytic Al-OH site per 25 neutral Si tetrahedral sites. Internal channel intersections and external terminations provide special stereochemical features suitable for complex organic species. Polymer migration along nano/micrometer channels of ancient weathered feldspars, plus exploitation of phosphorus and various transition metals in entrapped apatite and other microminerals, might have generated complexes of replicating catalytic biomolecules, leading to primitive cellular organisms. The first cell wall might have been an internal mineral surface, from which the cell developed a protective biological cap emerging into a nutrient-rich "soup." Ultimately, the biological cap might have expanded into a complete cell wall, allowing mobility and colonization of energy-rich challenging environments. Electron microscopy of honeycomb channels inside weathered feldspars of the Shap granite (northwest England) has revealed modern bacteria, perhaps indicative of Archean ones. All known early rocks were metamorphosed too highly during geologic time to permit simple survival of large-pore zeolites, honeycombed feldspar, and encapsulated species. Possible microscopic clues to the proposed mineral adsorbents/catalysts are discussed for planning of systematic study of black cherts from weakly metamorphosed Archaean sediments.  (+info)

Presence of Campylobacter and Salmonella in sand from bathing beaches. (5/2325)

The purpose of this study was to determine the presence of thermophilic Campylobacter spp. and Salmonella spp. in sand from non-EEC standard and EEC standard designated beaches in different locations in the UK and to assess if potentially pathogenic strains were present. Campylobacter spp. were detected in 82/182 (45%) of sand samples and Salmonella spp. in 10/182 (6%). Campylobacter spp. were isolated from 46/92 (50%) of samples from non-EEC standard beaches and 36/90 (40%) from EEC standard beaches. The prevalence of Campylobacter spp. was greater in wet sand from both types of beaches but, surprisingly, more than 30% of samples from dry sand also contained these organisms. The major pathogenic species C. jejuni and C. coli were more prevalent in sand from non-EEC standard beaches. In contrast, C. lari and urease positive thermophilic campylobacters, which are associated with seagulls and other migratory birds, were more prevalent in sand from EEC standard beaches. Campylobacter isolates were further characterized by biotyping and serotyping, which confirmed that strains known to be of types associated with human infections were frequently found in sand on bathing beaches.  (+info)

Immature germ cell separation using a modified discontinuous Percoll gradient technique in human semen. (6/2325)

The difficulty of identifying immature germ cells in unstained, fresh semen has led most laboratories to use the broad definition 'round cells' to indicate cells other than spermatozoa, thus grouping together both leukocytes and immature germ cells. This is also the case in research andrology, where very little attention has been given to immature germ cells in the semen apart from some rare exceptions, such as the attempts to study meiosis. Here we report on the use of a discontinuous Percoll gradient method modified to enable the best separation possible of immature germ cells from the other cells found in the ejaculate, in order to obtain a cellular suspension free of spermatozoa. Our technique (intra-assay variation in duplicates < 10%) demonstrated a high immature germ cell concentration in gradient fractions with 30% to 45% Percoll with a small contamination (1.5-6%) of leukocytes, confirmed by May-Grunwald-Giemsa staining, immunofluorescence and cytofluorimetry. The concentrations of immature germ cells ranged from zero in obstructive azoospermia to 2.0 x 10(6)/ml in oligozoospermia and genital tract infection. The purified immature germ cell suspensions obtained can be useful for diagnostic and research purposes.  (+info)

Comparative evaluation of two density gradient preparations for sperm separation for medically assisted conception. (7/2325)

To evaluate and optimize the sperm separation efficiency of a novel silane-coated silica bead (Puresperm), serial studies were carried out to compare the various sperm parameters between: (i) three-layer (90%-70%-40%) Puresperm and three-layer (90%-70%-40%) conventional polyvinylpyrrolidone (PVP)-coated silica bead (Percoll) gradients; (ii) three-layer (90%-70%-40%) and two-layer (90%-45%) Puresperm gradients and separately the same for Percoll; and (iii) large (3.0 ml) and small (0.75 ml) semen loading volumes on three-layer Puresperm gradients. Normozoospermic semen samples were treated and analysed in 12 replicates for each experiment. Manual evaluation of concentration, percentage motility, percentage vitality, percentage normal morphology; computer-assisted semen analysis evaluation of concentration, percentage motility, grade of motility, motion characteristics (curvilinear velocity, linearity, amplitude of lateral head velocity, beat cross frequency, percentage hyperactivation); and yields from the initial semen samples were compared. Percoll was found to be superior to Puresperm in concentration, percentage motility, percentage vitality and yields after three-layer density gradient centrifugation. There were no significant differences in sperm parameters between two- and three-layer Percoll gradients, but three-layer Puresperm gradients behaved significantly better than two-layer gradients. Large semen volume loads on three-layer Puresperm gradients resulted in greater sperm concentrations, percentage motility, percentage vitality and percentage normal morphology, but small semen volume loads produced greater yields of good-quality spermatozoa. In the light of Percoll being withdrawn from the shelf for the use of assisted reproduction because of the presence of PVP, three-layer Puresperm gradients with large semen loading volumes appear to be an attractive alternative for sperm separation in medically assisted conception.  (+info)

A post-stishovite SiO2 polymorph in the meteorite Shergotty: implications for impact events. (8/2325)

Transmission electron microscopy and electron diffraction show that the martian meteorite Shergotty, a shocked achondrite, contains a dense orthorhombic SiO2 phase similar to post-stishovite SiO2 with the alpha-PbO2 structure. If an SiO2 mineral exists in Earth's lower mantle, it would probably occur in a post-stishovite SiO2 structure. The presence of such a high-density polymorph in a shocked sample indicates that post-stishovite SiO2 structures may be used as indicators of extreme shock pressures.  (+info)

Adsorption and release of biocides with mesoporous silica nanoparticles - DAF eResearch Archive (eRABBB)Adsorption and release of biocides with mesoporous silica nanoparticles - DAF eResearch Archive (eRABBB)
In this proof-of-concept study, an agricultural biocide (imidacloprid) was effectively loaded into the mesoporous silica nanoparticles (MSNs) with different pore sizes, morphologies and mesoporous structures for termite control. This resulted in nanoparticles with a large surface area, tunable pore diameter and small particle size, which are ideal carriers for adsorption and controlled release of imidacloprid. The effect of pore size, surface area and mesoporous structure on uptake and release of imidacloprid was systematically studied. It was found that the adsorption amount and release profile of imidacloprid were dependent on the type of mesoporous structure and surface area of particles. Specifically, MCM-48 type mesoporous silica nanoparticles with a three dimensional (3D) open network structure and high surface area displayed the highest adsorption capacity compared to other types of silica nanoparticles. Release of imidacloprid from these nanoparticles was found to be controlled over 48 ...
http://era.daf.qld.gov.au/id/eprint/4044/
Subclinical nephrotoxicity associated with occupational silica exposure among male Kenyan industrial workers
OBJECTIVE: To determine early signs of renal injury due to occupational silica exposure. DESIGN: Cross-sectional analytical research. SETTINGS: Kenyatta National Hospital for the referent population and Clayworks ceramics, bricks and tiles factory for the assessment of occupational silica exposure. SUBJECTS: Thirty three non-smoking silica-exposed male industrial workers and 38 non-smoking male referents participated in this study. RESULTS: Silica-exposed males excreted significantly increased levels of U.TP, U.Malb, U.ALP, U.y-GT and U.LDH compared to referent males. Among the silica-exposed males, U.Si negatively correlated significantly with age, U.TP correlated significantly to each of U.ALP and U.LDH. However, no correlation was observed between work duration and U.Si. CONCLUSION: The present study shows that there is associated glomerular and proximal tubular damage among silica exposed workers which is not duration related and is seemingly subclinical and nonprogressive and urinary silica ...
http://erepository.uonbi.ac.ke:8080/xmlui/handle/11295/15363
A novel adsorbent photocatalyst consisting of titania and mesoporous silica nanoparticles<...
TY - JOUR. T1 - A novel adsorbent photocatalyst consisting of titania and mesoporous silica nanoparticles. AU - Uchiyama, Hiroaki. AU - Suzuki, Keisei. AU - Oaki, Yuya. AU - Imai, Hiroaki. PY - 2005/11/25. Y1 - 2005/11/25. N2 - The nanoscale combination of crystalline titania and mesoporous silica particles was successfully applied as a photocatalytic adsorbent for the rapid removal from air and complete decomposition of organic molecules. The composites consisted of anatase particles ca. 7 nm in diameter and mesoporous silica particles 10-100 nm in diameter, which provided a specific surface area of more than 1000 m2/g. The composites were prepared through the assembly of surfactant micelles and siliceous species in the presence of the titania nanoparticles. Acetaldehyde was quickly removed from air due to the large surface area of the mesoporous silica and then was gradually decomposed into carbon dioxide under UV illumination with mass transfer between the adsorbent and the titania ...
https://keio.pure.elsevier.com/en/publications/a-novel-adsorbent-photocatalyst-consisting-of-titania-and-mesopor
Bisindole anchored mesoporous silica nanoparticles for cyanide sensing in aqueous media<...
TY - JOUR. T1 - Bisindole anchored mesoporous silica nanoparticles for cyanide sensing in aqueous media. AU - Kim, Hyun Jung. AU - Lee, Hyejin. AU - Lee, Ji Ha. AU - Choi, Dong Hoon. AU - Jung, Jong Hwa. AU - Kim, Jong Seung. PY - 2011/10/21. Y1 - 2011/10/21. N2 - For CN- recognition, a series of bisindolyl compounds 1-3 were prepared, and their chromodosimetric color changes toward anions were investigated. Nucleophilic addition of the cyanide ion to the meso position of the bisindolyl group gave rise to breaking of the double bond conjugation, thereby inducing spectroscopic changes in the compound. Mesoporous silica nanoparticles 3 also gave color changes from deep orange to yellow in response to the cyanide ion.. AB - For CN- recognition, a series of bisindolyl compounds 1-3 were prepared, and their chromodosimetric color changes toward anions were investigated. Nucleophilic addition of the cyanide ion to the meso position of the bisindolyl group gave rise to breaking of the double bond ...
https://koreauniv.pure.elsevier.com/en/publications/bisindole-anchored-mesoporous-silica-nanoparticles-for-cyanide-se
Buy silicon dioxide heat capacity - silicon dioxide heat capacity on sale
Buy silicon dioxide heat capacity from silicon dioxide heat capacity manufacturer, 513 silicon dioxide heat capacity manufacturers & silicon dioxide heat capacity suppliers from China.
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Creative Diagnostics Announces New Fluorescent Silica Particles for Researchers - PharmiWeb.comCreative Diagnostics Announces New Fluorescent Silica Particles for Researchers - PharmiWeb.com
With years of experience in the pharmaceutical and life science sector, Creative Diagnostics recently launches a wide range of fluorescent silica particles with a high amount of covalently bound fluorescence dye in the silica matrix. These new fluorescent silica nanoparticles are available with red fluores...
https://www.pharmiweb.com/press-release/2018-12-12/creative-diagnostics-announces-new-fluorescent-silica-particles-for-researchers
hybrid triethoxysilylated ligand-modified fluorescent silica nanoparticleshybrid triethoxysilylated ligand-modified fluorescent silica nanoparticles
Page contains details about hybrid triethoxysilylated ligand-modified fluorescent silica nanoparticles . It has composition images, properties, Characterization methods, synthesis, applications and reference articles : nano.nature.com
http://nano.nature.com/nano/GR-M7283527
168g) Adsorption, Stabilization and Recovery of Polyphenolic Flavonoids By TiO2 Functionalized Mesoporous Silica Nanoparticles ...168g) Adsorption, Stabilization and Recovery of Polyphenolic Flavonoids By TiO2 Functionalized Mesoporous Silica Nanoparticles ...
Flavonoids such as quercetin and its derivatives, which are normally isolated from plants, are antioxidants with medicinal and therapeutic applications for the treatment of cancer, cardiovascular disease and other conditions because they act against tumors, inflammation, and reactive oxygen species. At the same time, because they are photoactive compounds, flavonoids are highly susceptible to degradation and activity loss after extraction from biological sources. Therefore, methods are needed to retain the activity of flavonoids during physicochemical processes and storage. A possible material of interest for binding, protection and release of a wide variety of compounds are engineered silica particles. Porous silica nanoparticles are of interest for the recovery, and more recently, the delivery of therapeutics. Recent progress in metal oxide chemistry allows the synthesis of silica nanoparticles of controlled size, pore properties, and surface functionalization. Titania (TiO2) dispersed in ...
https://www.aiche.org/conferences/aiche-annual-meeting/2016/proceeding/paper/168g-adsorption-stabilization-and-recovery-polyphenolic-flavonoids-tio2-functionalized-mesoporous
China High Quality Ink-Jet Printing Silicon Dioxide of High Quality - China Silicon Dioxide, SilicaChina High Quality Ink-Jet Printing Silicon Dioxide of High Quality - China Silicon Dioxide, Silica
China High Quality Ink-Jet Printing Silicon Dioxide of High Quality, Find details about China Silicon Dioxide, Silica from High Quality Ink-Jet Printing Silicon Dioxide of High Quality - Qingdao Jingtai Huacheng International Trade Co., Ltd.
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China Hot Sale Matting Agent Silicon Dioxide - China Silicon Dioxide, SilicaChina Hot Sale Matting Agent Silicon Dioxide - China Silicon Dioxide, Silica
China Hot Sale Matting Agent Silicon Dioxide, Find details about China Silicon Dioxide, Silica from Hot Sale Matting Agent Silicon Dioxide - Qingdao Jingtai Huacheng International Trade Co., Ltd.
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Imaging the Distribution of High Colloidal Stability Mesoporous Silica Nanoparticles (MSNs) with PET and MRIImaging the Distribution of High Colloidal Stability Mesoporous Silica Nanoparticles (MSNs) with PET and MRI
Biocompatible and high porosity mesoporous silica nanoparticles (MSNs) represent a significant advance in drug delivery applications, currently entering clinical validation. It will be necessary to track these drug vectors over time with medical imaging techniques. MRI could be used to monitor the blood signal enhancement, and therefore to validate blood retention of i.v.-injected MSNs. On the other hand, high-sensitivity PET would allow the quantitative and dynamic monitoring of nanoparticle biodistribution, a promising application of new PET/MRI systems. Here are for the first time presented dynamic MSN biodistribution data with MRI and PET. A recently developed high colloidal stability MSN system showing an intricate 3-D porous network, narrow particle size distribution (140 nm mean diam.) and very high porosity (up to 70% vol.), was grafted with DTPA enabling efficient chelation of 64Cu2+ and Gd3+. An efficient size-exclusion chromatography procedure was developed for rapid purification of
http://nsti.org/procs/Nanotech2013v3/1/M6.911
Hyaluronic acid modified mesoporous silica nanoparticles for targeted by Meihua Yu, Siddharth Jambhrunkar et al.Hyaluronic acid modified mesoporous silica nanoparticles for targeted by Meihua Yu, Siddharth Jambhrunkar et al.
In this paper, a targeted drug delivery system has been developed based on hyaluronic acid (HA) modified mesoporous silica nanoparticles (MSNs). HA-MSNs possess a specific affinity to CD44 over-expressed on the surface of a specific cancer cell line, HCT-116 (human colon cancer cells). The cellular uptake performance of fluorescently labelled MSNs with and without HA modification has been evaluated by confocal microscopy and fluorescence-activated cell sorter (FACS) analysis. Compared to bare MSNs, HA-MSNs exhibit a higher cellular uptake via HA receptor mediated endocytosis. An anticancer drug, doxorubicin hydrochloride (Dox), has been loaded into MSNs and HA-MSNs as drug delivery vehicles. Dox loaded HA-MSNs show greater cytotoxicity to HCT-116 cells than free Dox and Dox-MSNs due to the enhanced cell internalization behavior of HA-MSNs. It is expected that HA-MSNs have a great potential in targeted delivery of anticancer drugs to CD44 over-expressing tumors.
http://ro.uow.edu.au/ihmri/230/
Small sized mesoporous silica nanoparticles functionalized with mannose for retinoblastoma cell imaging - Archive ouverte HALSmall sized mesoporous silica nanoparticles functionalized with mannose for retinoblastoma cell imaging - Archive ouverte HAL
David Warther, Chiara Mauriello-Jimenez, Laurence Raehm, Corine Gerardin, Jean-Olivier Durand, et al.. Small sized mesoporous silica nanoparticles functionalized with mannose for retinoblastoma cell imaging. RSC Advances, Royal Society of Chemistry, 2014, pp.37171-37179. ⟨10.1039/c4ra05310a⟩. ⟨hal-01068017⟩ ...
https://hal.archives-ouvertes.fr/hal-01068017
Mesoporous silica nanoparticles in biomedical applications - Stoddart Mechanostereochemistry Group
Mesoporous silica nanoparticles in biomedical applications, (Z. Li, J. C. Barnes, A. Bosoy, J. F. Stoddart, J. I. Zink), Chem. Soc. Rev. 2012, 41, 2590-2605. ...
https://stoddart.northwestern.edu/publications/mesoporous-silica-nanoparticles-in-biomedical-applications/
carbon quantum dots capped mesoporous silica nanoparticlescarbon quantum dots capped mesoporous silica nanoparticles
Page contains details about carbon quantum dots capped mesoporous silica nanoparticles . It has composition images, properties, Characterization methods, synthesis, applications and reference articles : nano.nature.com
http://nano.nature.com/nano/GR-M7461612
white carbon powder silicon dioxide medium size for reinforcing silicon dioxide | manufacturer of polyacrylamide for water...white carbon powder silicon dioxide medium size for reinforcing silicon dioxide | manufacturer of polyacrylamide for water...
Silicon Dioxide (Silica), Powder -325 mesh, 99.5+%, 100g For Research & Development Not for drug, human, animal, or food use Specifications: SiO2 (Silicon Dioxide) 99.5+% Fe2O3 (Iron Oxide) . 0.02% Al2O3 (Aluminum Oxide) 0.2% TiO2 (Titanium Dioxide) 0.02% CaO (Calcium Oxide) 0.01% MgO (Magnesium Oxide) 0.01% Na2O (Sodium Oxide) 0.01% K2O (Potasium Oxide) 0.01% LOI (Loss On Ignition) 0.3%. Get Price ...
https://shorelinechurch.co.za/dop/white-carbon-powder-silicon-dioxide-medium-size-for-reinforcing-silicon-dioxide-15/
Porous silica spheres in macroporous structures and on nanofibres | Philosophical Transactions of the Royal Society of London A...Porous silica spheres in macroporous structures and on nanofibres | Philosophical Transactions of the Royal Society of London A...
In recent years, the studies of nanoparticles and nanostructures have attracted increasing interests worldwide. Porous nanospheres can potentially provide the advantages of both nanoparticles and high surface areas from micro-/mesopores in the nanoparticles. Porous silica spheres have been widely investigated owing to their broad applications in areas such as catalysis, controlled release and separation science. Pores in silica could be formed by using organic templates such as surfactants (Grün et al. 1991; Kresge et al. 1992), polymers (Zhao et al. 1998) and pre-formed structures (Meyers et al. 2002; Walsh et al. 2003; Zhang et al. 2004). Depending on the types of templates used, porous silica with micropores (2 nm or less), mesopores (2-50 nm) or macropores (50 nm or more) could be produced. Ordered mesoporous silica materials were normally prepared using ionic surfactants or block copolymers as directing agents (Kresge et al. 1992; Zhao et al. 1998). Under acidic conditions, porous silica ...
http://rsta.royalsocietypublishing.org/content/368/1927/4351
Indian Patents. 250467:A CRYSTALLINE INORGANIC MATERIAL HAVING LONG-RANGE CRYSTALLINITY AND A METHOD OF MAKING A MENOSTRUCTURED...
One aspect of the present invention relates to crystalline inorganic materials having long-range crystallinity and comprising a plurality of mesopores. A cross-sectional area of each of the plurality of mesopores is substantially the same. A method of producing a hydrocarbon material product is also disclosed. The method comprises contacting a higher molecular weight hydrocarbon material with the crystalline inorganic material under conditions of controlled temperature and pressure to produce a hydrocarbon material product having a lower molecular weight. A method of processing a polymer is also disclosed. The method comprises contacting a polymer with the crystalline inorganic material and thermally treating the polymer in the presence of the crystalline inorganic material. A method of water treatment is further disclosed. The method comprises contacting contaminated water with the crystalline inorganic material and removing contaminants from the water with the crystalline inorganic material ...
http://www.allindianpatents.com/patents/250467-a-crystalline-inorganic-material-having-long-range-crystallinity-and-a-method-of-making-a-menostructured-inorganic-material
The Effects of Crystalline Silica on Workers | The EI GroupThe Effects of Crystalline Silica on Workers | The EI Group
Silica is one of the most abundant and complex naturally occurring minerals and the main component of sand. Quartz is the stable crystal form of silica, while tridymite and cristobalite are less stable crystalline forms. Crystalline silica becomes the biggest threat when it is pulverized or changed into very small particles that can become airborne and inhaled. While respirable crystalline silica is an exposure risk for the general population, it is the biggest threat to workers that are exposed to it in their occupational and industrial settings. An estimated 2.3 million workers in the United States are exposed to silica with the greatest exposure being in the construction field.. Throughout history, occupational silica exposures have been mainly linked to with the quarrying of stone, making of stone products, stone cutting as well as masonry. Today, exposures can also occur in the manufacturing of asphalt, glass, pottery, brick, tile, concrete, mortar, plaster and many other construction ...
https://ei1.com/2019/08/13/the-effects-of-crystalline-silica-on-workers/
NIOSHTIC-2 Publications Search - 20022266 - Pooled analyses of renal disease mortality and crystalline silica exposure in...NIOSHTIC-2 Publications Search - 20022266 - Pooled analyses of renal disease mortality and crystalline silica exposure in...
Respirable crystalline silica exposure bas been associated with renal disease in recent literature. Approximately 2000000 people are occupationally exposed to silica in the USA, 100000 at more than twice the NIOSH recommended exposure limit of 0.05 mg/m3. We have examined renal disease mortality in three silica-exposed cohorts totaling 13382 workers; 51 died with renal disease (ICD codes 580-587,
https://www.cdc.gov/niosh/nioshtic-2/20022266.html
Differential proteomics highlights macrophage-specific responses to amorphous silica nanoparticles - Nanoscale (RSC Publishing)Differential proteomics highlights macrophage-specific responses to amorphous silica nanoparticles - Nanoscale (RSC Publishing)
The technological and economic benefits of engineered nanomaterials may be offset by their adverse effects on living organisms. One of the highly produced nanomaterials under such scrutiny is amorphous silica nanoparticles, which are known to have an appreciable, although reversible, inflammatory potential.
http://pubs.rsc.org/en/Content/ArticleLanding/2017/NR/C7NR02140B
Silica exposure and work-relatedness evaluation for occupational cancer in Korea | Annals of Occupational and Environmental...Silica exposure and work-relatedness evaluation for occupational cancer in Korea | Annals of Occupational and Environmental...
Silica, or silicon dioxide (SiO2), is a group IV metal oxide, which naturally occurs in both crystalline and amorphous forms. The most abundant form of silica is α-quartz, and the term quartz is often used in place of the general term crystalline silica. Crystalline silica has been classified as a definite carcinogen (Group 1) causing lung cancer by the International Agency for Research on Cancer (IARC) [1]. In some studies, kidney, stomach, and esophageal cancers have also been reported to be associated with crystalline silica [2, 3]. In Korea, mining, stone cutting, construction, and refining are known to be hazardous industries with respect to crystalline silica exposure, and many silicosis cases have occurred among these industries [4]. There has been no systematic survey on the number of workers exposed to crystalline silica in Korea, but in one survey in 2005, the number of workers handling crystalline silica was estimated to be about 48,000, while the number of crystalline silica ...
https://aoemj.biomedcentral.com/articles/10.1186/s40557-018-0216-1
DiagNano™ PEG-Amine Silica-Coated Gold Nanorods, 40 nm, Absorption Max 750 nm, 20 nm Silica Shell - CD BioparticlesDiagNano™ PEG-Amine Silica-Coated Gold Nanorods, 40 nm, Absorption Max 750 nm, 20 nm Silica Shell - CD Bioparticles
Use DiagNano™ PEG-Amine Silica-Coated Gold Nanorods, 40 nm, Absorption Max 750 nm, 20 nm Silica Shell for fast, easy, and consistent DNA/RNA Purification, Antibody/Protein Purification, Cell Isolation.
https://www.cd-bioparticles.com/product/diagnano-peg-amine-silica-coated-gold-nanorods-40-nm-absorption-max-750-nm-20-nm-silica-shell-item-pra-40-750-20-8576.html
DiagNano™ PEG-Amine Silica-Coated Gold Nanorods, 10 nm, Absorption Max 1064 nm, 5 nm Silica Shell - CD BioparticlesDiagNano™ PEG-Amine Silica-Coated Gold Nanorods, 10 nm, Absorption Max 1064 nm, 5 nm Silica Shell - CD Bioparticles
Use DiagNano™ PEG-Amine Silica-Coated Gold Nanorods, 10 nm, Absorption Max 1064 nm, 5 nm Silica Shell for fast, easy, and consistent DNA/RNA Purification, Antibody/Protein Purification, Cell Isolation.
https://www.cd-bioparticles.com/product/diagnano-peg-amine-silica-coated-gold-nanorods-10-nm-absorption-max-1064-nm-5-nm-silica-shell-item-pra-10-1064-5-8497.html
NIOSHTIC-2 Publications Search - 20023429 - Assessment of occupational silica exposures on continuous mining operations.NIOSHTIC-2 Publications Search - 20023429 - Assessment of occupational silica exposures on continuous mining operations.
Data on dust-control practices, mining conditions and occupational exposures were gathered for approximately 80 underground continuous mining units. Despite silica contents on dust samples in excess of 5%, nearly forty units successfully maintained silica concentrations at or below 100 ug/m3 on a majority of occupational dust samples, while the remainder had difficulty maintaining this level. Thes
https://www.cdc.gov/niosh/nioshtic-2/20023429.html
Glycan-Functionalized Fluorescent Chitin Nanocrystals for Biorecognition ApplicationsGlycan-Functionalized Fluorescent Chitin Nanocrystals for Biorecognition Applications
This thesis consists of three parts, which revolve around the fabrication of multifunctional glyconanomaterials (cellulose nanocrystals, chitin nanocrystals, mesoporous silica nanoparticles) and the development of their applications in biorecognition and nanomedicine.. Part one presents a detailed introduction to glyconanomaterials, focusing on cellulose nanocrystals, chitin nanocrystals and mesoporous silica nanoparticles, including their general preparations, properties and applications.. Part two demonstrates dually modified cellulose and chitin nanocrystals. They are prepared by TEMPO-mediated oxidation, followed by conjugation with a fluorescent dye and carbohydrate ligands. The two functional nanocrystals are applied in carbohydrate-lectin recognition and bacterial imaging as new types of glyconanomaterials.. Part three describes two types of drug delivery systems based on carbohydrate- conjugated mesoporous silica nanoparticles: the first type is a trehalose- functionalized nanoparticle ...
http://kth.diva-portal.org/smash/record.jsf?pid=diva2:723645
China Silica Dioxide/Food Grade Silicon Dioxide/White Carbon Black - China Sio2, PaintingChina Silica Dioxide/Food Grade Silicon Dioxide/White Carbon Black - China Sio2, Painting
China Silica Dioxide/Food Grade Silicon Dioxide/White Carbon Black, Find details about China Sio2, Painting from Silica Dioxide/Food Grade Silicon Dioxide/White Carbon Black - Guangdong XiMi Chemical Co., Ltd.
http://xm-chemical.en.made-in-china.com/product/WjimFrsvEncD/China-Silica-Dioxide-Food-Grade-Silicon-Dioxide-White-Carbon-Black.html
Self-Assembly of Nanoporous Silica Particles for Tagging and Sensing Applications - Tufts Digital Library
Abstract: Meso(nano)porous silica particles are of broad interest for many photonic applications, filtration, drug delivery, catalysis. Through a self-assembly process, one can achieve silica particles spanning in size from microns to tens of nanometer. In the early stage of self-assembly it is observed that 20-50 nm seed particles are formed with hexagonally packed open cylindrical nanochannels. ... read moreHowever, what is unknown is how these seed-like particles aggregate and self-align their pores to form final multi-micron particles with self-sealed channels extended over the entire particle.. In the course of this research, we examined the assembly mechanism of mesoporous multi-micron size silica particles with long cylindrical pores of 4-5 nm in diameter.We further showed that the observed alignment of channels was thermodynamically favored by a decrease in the Gibbs free energy of the particles. Besides a fundamental understanding of the mechanism of morphogenesis and pore formation, we ...
https://dl.tufts.edu/catalog/tufts:23119
Intestinal absorption and biological effects of orally administered amorphous silica particles | Nanoscale Research Letters |...Intestinal absorption and biological effects of orally administered amorphous silica particles | Nanoscale Research Letters |...
In the present study, we attempted to quantify the absorption of silica particles by using ICP-OES to measure the silicon content in the liver and blood after 28-day oral exposure. However, we did not detect the silicon content in the biological tissue with this analytical protocol (data not shown; detection limit of the protocol, 0.1 μg). ICP-OES protocols are regarded to be suitable for measuring silica; however, our attempt to measure ultratrace levels of the silicon content derived from silica particles may have been hindered by interference from nitrogen present in the air. Other groups have also been unable to determine the level of the silicon content derived from with ICP-OES after oral exposure because of interference [11]. We therefore tried to measure the absorption of silica particles through the intestine by means of a combination of the everted gut sac method and ICP-OES. The advantages of this model are that there is a relatively large surface area available for absorption and ...
https://nanoscalereslett.springeropen.com/articles/10.1186/1556-276X-9-532
Is Silicon Dioxide Soluble in Water? | Reference.comIs Silicon Dioxide Soluble in Water? | Reference.com
The solubility of silicon dioxide, SiO2, in water depends on a number of different factors, including pressure, temperature and the structure of its surface. Generally speaking, silicon dioxide is...
https://www.reference.com/science/silicon-dioxide-soluble-water-51c32d34cdddffbb
US Patent Application for SILICON DIOXIDE POWDER HAVING SPECIAL SURFACE PROPERTIES AND TONER COMPOSITION CONTAINING SAID POWDER...US Patent Application for SILICON DIOXIDE POWDER HAVING SPECIAL SURFACE PROPERTIES AND TONER COMPOSITION CONTAINING SAID POWDER...
The invention relates to silicon dioxide powder which is present in the form of aggregated primary particles having an average diameter of at least 40 nm and a ratio of the BET surface area to the STSA surface area of at least 3.5. The invention also relates to a toner composition containing said silicon dioxide powder.
https://patents.justia.com/patent/20130204029
OSHA Publishes Proposed Rule on Exposure to Crystalline Silica
The Occupational Safety & Health Administration (OSHA) published its proposed rule for occupational exposure to respirable crystalline silica in the Federal Register yesterday. The proposed rule includes two standards, one for general industry and maritime and the other specifically for construction. The construction standard would reduce the current permissible exposure limit (PEL) of respirable crystalline silica which was established in 1971 from 250 micrograms per cubic meter averaged over an 8-hour day down to 50 micrograms per cubic meter. OSHA claims the proposed rule would save the lives of 560 construction workers and prevent 1,080 cases of silicosis a year. Its estimated that approximately 1.85 million construction workers are exposed to respirable crystalline silica at their workplace.. Silica, also known as silicon dioxide, is a chemical compound that occurs in nature as a basic component of sand and quartz. Silica is found in a number of building materials including shingles, ...
http://constructiondatacompany.com/osha-publishes-proposed-rule-on-exposure-to-crystalline-silica/
2/11/2014- Comments on OHSAs Proposed Occupational Exposure to Respirable Crystalline Silica Rule | The U.S. Small Business...2/11/2014- Comments on OHSAs Proposed Occupational Exposure to Respirable Crystalline Silica Rule | The U.S. Small Business...
Fact Sheet. February --11, 2014. BY ELECTRONIC MAIL. The Honorable David Michaels, PhD, MPH. Assistant Secretary of Labor for Occupational Safety and Health. U.S. Department of Labor. 200 Constitution Avenue, NW. Washington, DC 20210. Electronic Address: http://www.regulations.gov. Re: Comments on OHSAs Proposed Occupational Exposure to Respirable Crystalline Silica Rule (RIN 1218-AB70; Docket No. OSHA-2010-0034). Dear Assistant Secretary Michaels:. The U.S. Small Business Administrations Office of Advocacy (Advocacy) submits the following comments on the Occupational Safety and Health Administrations (OSHAs) Proposed Occupational Exposure to Respirable Crystalline Silica Rule.[1] OSHAs proposed rule would establish a new permissible exposure limit (PEL) and action level for respirable crystalline silica and impose a host of ancillary requirements, such as exposure assessments, medical monitoring, engineering and work practice controls, personal protective equipment, respiratory protection ...
https://www.sba.gov/content/2112014-comments-ohsa%E2%80%99s-proposed-occupational-exposure-respirable-crystalline-silica-rule
Preparation of micrometer- to sub-micrometer-sized nanostructured silica particles using high-energy ball milling<...
TY - JOUR. T1 - Preparation of micrometer- to sub-micrometer-sized nanostructured silica particles using high-energy ball milling. AU - Hampsey, J. Eric. AU - De Castro, Claudio L.. AU - McCaughey, Byron. AU - Wang, Donghai. AU - Mitchell, Brian S.. AU - Lu, Yunfeng. PY - 2004/7/1. Y1 - 2004/7/1. N2 - Nanostructured porous silica particles with sizes in the micrometer to sub-micrometer range are of great interest due to their potential applications as catalyst supports and nanocomposite materials. However, if these particles are to be used in industry, a process must be developed to affordably produce them on a large scale. This paper reports on a high-energy ball-milling process that has been used to create micrometer- to sub-micrometer-sized mesoporous silica particles starting from a silica xerogel prepared by a surfactant self-assembly sol-gel process. We have studied various milling conditions such as milling media (zirconia, stainless steel, or steel-centered nylon balls), milling time, ...
https://pennstate.pure.elsevier.com/en/publications/preparation-of-micrometer-to-sub-micrometer-sized-nanostructured-
Mesoporous Silica-Supported Amidozirconium-Catalyzed Carbonyl Hydroboration (Journal Article) | SciTech ConnectMesoporous Silica-Supported Amidozirconium-Catalyzed Carbonyl Hydroboration (Journal Article) | SciTech Connect
The hydroboration of aldehydes and ketones using a silica-supported zirconium catalyst is reported. Reaction of Zr(NMe 2) 4 and mesoporous silica nanoparticles (MSN) provides the catalytic material Zr(NMe 2) [email protected] Exhaustive characterization of Zr(NMe 2) [email protected] with solid-state (SS)NMR and infrared spectroscopy, as well as through reactivity studies, suggests its surface structure is primarily ≡SiOZr(NMe 2) 3. The presence of these nitrogen-containing zirconium sites is supported by 15N NMR spectroscopy, including natural abundance 15N NMR measurements using dynamic nuclear polarization (DNP) SSNMR. The Zr(NMe 2) [email protected] material reacts with pinacolborane (HBpin) to provide Me 2NBpin and the material ZrH/[email protected] that is composed of interacting surface-bonded zirconium hydride and surface-bonded borane ≡SiOBpin moieties in an approximately 1:1 ratio, as well as zirconium sites coordinated by dimethylamine. The ZrH/[email protected] is characterized by 1H/ 2H and 11B SSNMR and infrared spectroscopy and ...
https://www.osti.gov/scitech/biblio/1226905-mesoporous-silica-supported-amidozirconium-catalyzed-carbonyl-hydroboration
Sungkyunkwan University
Figure 3. In vivo comparison of wound healing on mice by methods and time. Once the wound is closed and healed, the colloidal mesoporous silica nanoparticles degrade easily in biological media. The fact that colloidal silica nanoparticles degrade is advantageous, confirming the possibility of being used as biocompatible adhesive material.. The research was supported by the Engineering Research Center and the Bank of Porous Nanoparticles from the National Research Foundation (NRF) of Korea, and was published in the journal ACS Applied Materials and Interfaces (Impact Factor 7.504) on August 24th, 2017.. Title: Colloidal Mesoporous Silica Nanoparticles as Strong Adhesives for Hydrogels and Biological Tissues. Authors: Joo-Hyung KIM (Research Assistant), Hodae KIM (M.S.), Youngjin CHOI (Ph.D), Doo Sung LEE (Professor), Jaeyun KIM (Associate Professor), and Gi-Ra YI (Associate Professor). The research team is currently continuing this study to combine wound healing agents for colloidal mesoporous ...
http://www.skku.edu/eng_home/campus/skk_comm/news_view.jsp?bName=board_news&bCode=1&boardNum=2402
Enhancing plasma peptide MALDI-TOF-MS profiling by mesoporous silica assisted crystallization<...
TY - JOUR. T1 - Enhancing plasma peptide MALDI-TOF-MS profiling by mesoporous silica assisted crystallization. AU - Terracciano, Rosa. AU - Casadonte, Francesca. AU - Pasqua, Luigi. AU - Candeloro, Patrizio. AU - Di Fabrizio, Enzo. AU - Urbani, Andrea. AU - Savino, Rocco. PY - 2010/2/15. Y1 - 2010/2/15. N2 - Promising profiling techniques based on new material/solid phase extraction for capturing molecular signatures from body fluids are being coupled to MALDI-TOF-MS. Sample preparation significantly influences spectrum quality in this ionization method. Mesoporous silica beads (MSB), by the means of nano-sized porous channels with high surface area, enable harvesting of peptides from plasma and serum excluding large size proteins. We have investigated the morphology of a sample slurry, developed as a new tool for plasma peptides enrichment based on mesoporous materials. Our study highlights a correlation between crystals morphology and enhanced performances in MALDI-TOF-MS analysis. This is ...
https://research.kaust.edu.sa/en/publications/enhancing-plasma-peptide-maldi-tof-ms-profiling-by-mesoporous-sil
ARTICLES INCLUDING NANOSILICA-BASED PRIMERS FOR POLYMER COATINGS AND METHODS - Patent applicationARTICLES INCLUDING NANOSILICA-BASED PRIMERS FOR POLYMER COATINGS AND METHODS - Patent application
0101] 1. A coated article comprising a substrate surface, a nanoparticle-containing primer disposed on the substrate surface, and a silicone-based material bonded to the nanoparticle-containing primer, wherein the nanoparticle-containing primer comprises agglomerates of silica nanoparticles, said agglomerates comprising a three-dimensional porous network of silica nanoparticles, and the silica nanoparticles being bonded to adjacent silica nanoparticles. 2. The coated article of embodiment 1, wherein the silica nanoparticles are spherical and have an average particle diameter of less than 40 nanometers. 3. The coated article of embodiment 1, wherein the silica nanoparticles are spherical and have an average particle diameter of less than 20 nanometers. 4. The coated article of embodiment 1, wherein the silica nanoparticles are spherical and have an average particle diameter of less than 10 nanometers. 5. The coated article of any one of embodiments 1 through 4, wherein the substrate surface ...
http://www.patentsencyclopedia.com/app/20130040126
449ca) Preparation of Amine Modified Bimodal Mesoporous Silica Particles for CO2 Separation | AIChE449ca) Preparation of Amine Modified Bimodal Mesoporous Silica Particles for CO2 Separation | AIChE
Mesoporous silica has been extensively studied for many applications such as CO2 adsorbents, drug delivery, catalysis, and so on. Among them, bimodal mesoporous silica (BMS), which had two different sizes of mesopores, have drawn much attention recently because it exhibited unique diffusion properties in the pores. For this reason, when BMS was modified to have affinity with CO2, it was expected that both of high CO2 adsorption capacity and fast adsorption rate would be achieved by small and large pores, respectively. Therefore, we prepared various kinds of amine modified BMS, and the effects of pore structure of BMS samples and the type of introduced amine on CO2 adsorption/desorption properties were examined in this study. In the experiments, BMS were prepared by co-condensation of two different silica precursors. Tetraethylorthosilicate (TEOS) and triblock copolymer Purulonic 123 (P123) were used as silica precursors and templating agent, respectively. Polymethylhydrosiloxane (PMHS) was not ...
https://www.aiche.org/conferences/aiche-annual-meeting/2016/proceeding/paper/449ca-preparation-amine-modified-bimodal-mesoporous-silica-particles-co2-separation
OSA | Thermal and Kerr nonlinear properties of plasma-deposited silicon nitride/silicon dioxide waveguidesOSA | Thermal and Kerr nonlinear properties of plasma-deposited silicon nitride/silicon dioxide waveguides
We introduce and present experimental evaluations of loss and nonlinear optical response in a waveguide and an optical resonator, both implemented with a silicon nitride/silicon dioxide material platform prepared by plasma-enhanced chemical vapor deposition with dual frequency reactors that significantly reduce the stress and the consequent loss of the devices. We measure a relatively small loss of ~4dB/cm in the waveguides. The fabricated ring resonators in add-drop and all-pass arrangements demonstrate quality factors of Q=12,900 and 35,600. The resonators are used to measure both the thermal and ultrafast Kerr nonlinearities. The measured thermal nonlinearity is larger than expected, which is attributed to slower heat dissipation in the plasma-deposited silicon dioxide film. The n 2 for silicon nitride that is unknown in the literature is measured, for the first time, as 2.4×10-15cm2/W, which is 10 times larger than that for silicon dioxide.. ©2008 Optical Society of America. Full Article , ...
https://www.osapublishing.org/oe/abstract.cfm?URI=oe-16-17-12987
Proton conductivity of Nafion/ex situ Stöber silica nanocomposite membranes as a function of silica particle size and...
TY - JOUR. T1 - Proton conductivity of Nafion/ex situ Stöber silica nanocomposite membranes as a function of silica particle size and temperature. AU - Muriithi, Beatrice. AU - Loy, Douglas A.. PY - 2014/2/1. Y1 - 2014/2/1. N2 - In the first systematic study of the influence of the size of silica particles on ion exchange capacity (IEC) and proton conductivity of Nafion-silica nanocomposite membranes, thin films cast from mixtures of silica particles (5 wt%) with varying diameters ranging from 10 to 400 nm and Nafion in alcohol were examined. IECs decreased exactly as expected with the dilution of Nafion and its sulfonic acid groups with added silica. At 80 C, the proton conductivity was also less with silica particles. However, at higher temperatures (120 C), there was a 58 % improvement in proton conductivity at low relative humidity and a 45 % improvement at higher relative humidity for nanocomposite membranes prepared with silica particles ,50 nm in size. The improvement was less ...
https://arizona.pure.elsevier.com/en/publications/proton-conductivity-of-nafionex-situ-st%C3%B6ber-silica-nanocomposite-
Mesoporous silica particles potentiate antigen-specific T-cell responsesMesoporous silica particles potentiate antigen-specific T-cell responses
Aim: To study the adjuvant effect of mesoporous silica particles and their capability of modifying an already existing allergic Th2-like immune response. Materials & methods: The adjuvant effect of Santa Barbara Amorphous-15 (SBA-15) mesoporous silica particles was studied in an antigen-specific ovalbumin (OVA) system in vitro and in vivo. The capacity of the OVA-loaded SBA-15 particles (SBA-15-OVA) to modify an existing immune response was assessed in a murine allergy model. Results: SBA-15-OVA induced significantly stronger OVA-specific splenocyte proliferation compared with OVA alone. Significantly higher IFN-gamma production was observed in ex vivo OVA-stimulated splenocytes from SBA-15-OVA-immunized mice compared with mice injected with only SBA-15 or OVA. Treatment of OVA-sensitized mice with SBA-15-OVA modified the immune response with significantly lower serum levels of OVA-specific IgE and higher IgG levels compared with the alum-OVA-treated group. Conclusion: The results are promising ...
http://su.diva-portal.org/smash/record.jsf?faces-redirect=true&language=en&searchType=SIMPLE&query=&af=%5B%5D&aq=%5B%5B%5D%5D&aq2=%5B%5B%5D%5D&aqe=%5B%5D&pid=diva2%3A767793&noOfRows=50&sortOrder=author_sort_asc&sortOrder2=title_sort_asc&onlyFullText=false&sf=all
A fluorescence spectroscopy assay for real-time monitoring of enzyme immobilization into mesoporous silica particlesA fluorescence spectroscopy assay for real-time monitoring of enzyme immobilization into mesoporous silica particles
Mesoporous silica particles are used as support material for immobilization of enzymes. Here we investigated a fluorescence-based assay for real-time monitoring of the immobilization of lipase, bovine serum albumin, and glucose oxidase into micrometer-sized mesoporous silica particles. The proteins are labeled with the dye epicocconone, and the interaction with the particles is observed as an increase in emission intensity of the protein-dye conjugates that can be quantified if correcting for a comparatively slow photobleaching. The immobilization occurs in tens of minutes to hours depending on particle concentration and type of protein. In the limit of excess particles over proteins, the formation of the particle-protein complexes can be described by a single exponential growth for all three investigated proteins, and the fitted pseudo-first-order rate constant increases linearly with particle concentration for each protein type. The derived second-order rate constant k varies with the protein
http://publications.lib.chalmers.se/publication/214301-a-fluorescence-spectroscopy-assay-for-real-time-monitoring-of-enzyme-immobilization-into-mesoporous
Surface Solutions - Mokena Granite & Quartz Countertops, Orland Park Granite & Quartz CountertopsSurface Solutions - Mokena Granite & Quartz Countertops, Orland Park Granite & Quartz Countertops
Granite & Quartz Countertops Mokena, Granite & Quartz Countertops Orland Park, Granite Countertops & Quartz Tinley Park, Granite & Quartz Countertops New Lenox, Granite & Quartz Countertops Frankfort, Granite & Quartz Countertops Homer Glen, Granite & Quartz Countertops Lockport, Granite & Quartz Countertops Lemont, Granite & Quartz Countertops Bolingbrook, Granite & Quartz Countertops Romeville, Granite Countertops & Quartz Joliet, Granite & Quartz Countertops Oak Forest, Granite & Quartz Countertops Matteson, Granite & Quartz Countertops Homewood, Granite & Quartz Countertops Palos Heights, Granite & Quartz Countertops Midlothian, Granite & Quartz Countertops Chicago, Granite & Quartz Countertops Manhattan, Granite & Quartz Countertops Monee, Granite & Quartz Countertops Manteno, Granite & Quartz Countertops Channahon, Granite & Quartz Countertops Shorewood, Natural Stone Countertops, Granite Countertops, Marble Countertops, Quartz Countertops, Quartzite Countertops, Quartz Countertops
http://www.surfacesolutionsil.com/locations.html
Molecules | Free Full-Text | Inkjet Printing of Drug-Loaded Mesoporous Silica Nanoparticles-A Platform for Drug DevelopmentMolecules | Free Full-Text | Inkjet Printing of Drug-Loaded Mesoporous Silica Nanoparticles-A Platform for Drug Development
Mesoporous silica nanoparticles (MSNs) have shown great potential in improving drug delivery of poorly water soluble (BCS class II, IV) and poorly permeable (BCS class III, IV) drugs, as well as facilitating successful delivery of unstable compounds. The nanoparticle technology would allow improved treatment by reducing adverse reactions of currently approved drugs and possibly reintroducing previously discarded compounds from the drug development pipeline. This study aims to highlight important aspects in mesoporous silica nanoparticle (MSN) ink formulation development for digital inkjet printing technology and to advice on choosing a method (2D/3D) for nanoparticle print deposit characterization. The results show that both unfunctionalized and polyethyeleneimine (PEI) surface functionalized MSNs, as well as drug-free and drug-loaded MSN-PEI suspensions, can be successfully inkjet-printed. Furthermore, the model BCS class IV drug remained incorporated in the MSNs and the suspension remained physically
http://www.mdpi.com/1420-3049/22/11/2020
Crystalline Silica PrimerCrystalline Silica Primer
Crystalline silica is the scientific name for a group of minerals composed of silicon and oxygen. The term crystalline refers to the fact that the oxygen and silicon atoms are arranged in a threedimensional repeating pattern. This group of minerals has shaped human history since the beginning of civilization. From the sand used for making glass to the piezoelectric quartz crystals used in advanced communication systems, crystalline silica has been a part of our technological development. Crystalline silicas pervasiveness in our technology is matched only by its abundance in nature. Its found in samples from every geologic era and from every location around the globe. Scientists have known for decades that prolonged and excessive exposure to crystalline silica dust in mining environments can cause silicosis, a noncancerous lung disease. During the 1980s, studies were conducted that suggested that crystalline silica also was a carcinogen. As a result of these findings, crystalline...
https://pubs.er.usgs.gov/publication/70005358
black sand mining in the worldblack sand mining meaning
Black Sands, Green Plans And Vernacular (In) Securities In The ,black sands, green plans and vernacular (in)securities in the contested madagascar is one of the many countries that have undergone such reforms and have in the context of emerging conflicts around mining and conservation since 2007. towards means to green economic activity and make economic development .What Is Zircon Sand Used For?,zircon sand, zircon silicate (zrsio4), is found in mineral sand deposits, the majority of which is the majority of zircon sand is mined in australia and the african continent. current annual global production is in excess of one million tonnes..Black Sands Mining Metallurgy,magnetic separator gold mining,wet magnetic black sand . black sand processing mobile crushers all over the world black sand petroleum pan asia mining limited overview. definition of black sand mining. which are widely used in ..Sand Smuggling In Southeast Asia,sand smuggling is a cross-border environmental crime which describes the
https://www.casablancaband.de/company_news/gangue/black_sand_mining_in_the_worldblack_sand_mining_meaning.html
Incorporation of Europium (III) coordination compounds into silica mic by Johnathan Nathanael BrantlyIncorporation of Europium (III) coordination compounds into silica mic by Johnathan Nathanael Brantly
The unique optical properties of silica microspheres and lanthanoid elements present the opportunity to adapt silica microspheres containing rare earth elements for novel optical applications. The research demonstrates the first example of incorporating insoluble lanthanoid coordination compounds into silica microspheres. The work explored the controlled synthesis of silica microspheres and the reaction conditions under which lanthanoid complexes can be incorporated into the microspheres. The environment of the coordinated lanthanoid ions before and after incorporation into silica microspheres was probed using spectroflurophotometry. The surface morphology of silica microspheres was characterized using atomic force microscopy (AFM) and scanning electron microscopy (SEM). The work explored novel syntheses of lanthanoid monoporphyrinates. The work also explored the incorporation of porphyrin macrocycles into silica microspheres.
https://digitalcommons.wku.edu/stu_hon_theses/231/
Structure and Function of Adsorbed Hemoglobin on Silica Nanoparticles: Relationship between the Adsorption Process and the...Structure and Function of Adsorbed Hemoglobin on Silica Nanoparticles: Relationship between the Adsorption Process and the...
The connection between the mechanisms of protein adsorption on nanoparticles and the structural and functional properties of the adsorbed protein often remains unclear. We investigate porcine hemoglobin adsorption on silica nanoparticles and we analyze the structural and functional modifications of adsorbed hemoglobin by UV-vis spectrophotometry, circular dichroism and oxygen binding measurement. The structural analysis of adsorbed hemoglobin on silica nanoparticles reveals a significant loss of secondary structure and a preservation of the heme electronic structure. However, adsorbed hemoglobin retains its quaternary structure and exhibits an enhanced oxygen affinity with cooperative binding. Moreover, the structural and functional modifications are fully reversible after complete desorption from silica nanoparticles at pH 8.7. The tunable adsorption and desorption of hemoglobin on SNPs with pH change, and the full control of hemoglobin activity by pH, temperature and the addition of inorganic
https://hal-cea.archives-ouvertes.fr/cea-01510273
Patente US5725884 - Pharmaceutical excipient having improved compressibility - Google PatentesPatente US5725884 - Pharmaceutical excipient having improved compressibility - Google Patentes
A microcrystalline cellulose-based excipient having improved compressibility, whether utilized in direct compression, dry granulation or wet granulation formulations, is disclosed. The excipient is an agglomerate of microcrystalline cellulose particles and from about 0.1% to about 20% silicon dioxide particles, by weight of the microcrystalline cellulose, wherein the microcrystalline cellulose and silicon dioxide are in intimate association with each other. The silicon dioxide utilized in the novel excipient has a particle size from about 1 nanometer to about 100 microns. Most preferably, the silicon dioxide is a grade of colloidal silicon dioxide.
http://www.google.es/patents/US5725884?hl=es&dq=flatulence
Biocompatibility of Amine-Functionalized Silica Nanoparticles: The Role of Surface Coverage<...
TY - JOUR. T1 - Biocompatibility of Amine-Functionalized Silica Nanoparticles. T2 - The Role of Surface Coverage. AU - Hsiao, I. Lun. AU - Fritsch-Decker, Susanne. AU - Leidner, Arnold. AU - Al-Rawi, Marco. AU - Hug, Vanessa. AU - Diabaté, Silvia. AU - Grage, Stephan L.. AU - Meffert, Matthias. AU - Stoeger, Tobias. AU - Gerthsen, Dagmar. AU - Ulrich, Anne S.. AU - Niemeyer, Christof M.. AU - Weiss, Carsten. PY - 2019/3/8. Y1 - 2019/3/8. N2 - Here, amorphous silica nanoparticles (NPs), one of the most abundant nanomaterials, are used as an example to illustrate the utmost importance of surface coverage by functional groups which critically determines biocompatibility. Silica NPs are functionalized with increasing amounts of amino groups, and the number of surface exposed groups is quantified and characterized by detailed NMR and fluorescamine binding studies. Subsequent biocompatibility studies in the absence of serum demonstrate that, irrespective of surface modification, both plain and ...
https://tmu.pure.elsevier.com/en/publications/biocompatibility-of-amine-functionalized-silica-nanoparticles-the
Synthesis of cyclam-capped β-cyclodextrin-bonded silica particles for use as chiral stationary phases in capillary...
β-Cyclodextrin (β-CD) was anchored onto silica particles at its C(2) position, derivatized primarily at the C(6) position by treatment with bromoacetyl bromide, and finally reacted with two types of cyclams to form cyclam-capped β-CD-bonded silica particles. When used as chiral stationary phases in capillary electrochromatography, these novel bonded silica particles exhibited excellent enantioselectivities for chiral separations. © 2002 Elsevier Science Ltd. All rights reserved ...
http://scholarbank.nus.edu.sg/handle/10635/77177
Silicon Dioxide Nanoparticles Can Exert Cytotoxic Effects on Neural CellsSilicon Dioxide Nanoparticles Can Exert Cytotoxic Effects on Neural Cells
The health risk and cytotoxic effects of nanoparticles are almost unknown. Consequently, we have launched an interdisciplinary research program to systematically investigate the toxicity of nanoparticles. An initial observation prompted us to hypothesize that SiO2 nanoparticles can traverse the plasma membranes of cells through the endocytosis mechanism and thereby exert their cellular and cytotoxic effects on cells. To test this hypothesis, we investigated the effects of silicon dioxide nanoparticles on two human brain tumor cell lines (SK-N-SH, a neuroblastoma line and U87, an astrocytoma line) employing light microscopy, lactate dehydrogenase release into the culture medium (an indicator of cell damage and necrosis) and MTT assay (an indicator of cell survival). Our results indicate exposure to SiO2 nanoparticles led to cytotoxic damage (as indicated by LDH release) and decreases in cell survival (as determined by the MTT assay) in SK-N-SH and U87 cells in a dose-related manner, their effect being
http://www.nsti.org/procs/Nanotech2007v2/8/W78.114
Review of the Health Effects associated with Exposure to Respirable Crystalline Silica in Coal Dust | Coal ServicesReview of the Health Effects associated with Exposure to Respirable Crystalline Silica in Coal Dust | Coal Services
a) What are the adverse health effects from exposure to crystalline silica in respirable coal dust and are they different in any way to those from exposure to pure crystalline silica?. b) Is the current NSW exposure standard of 0.15 mg/m3 respirable silica sufficient to prevent the onset of any disease outcome identified in (a)?. The authors viewed current available research and data provided by CSPL on coal dust and quartz exposures and on incidence of diseases in NSW coal miners. Where appropriate, personal contacts were initiated with persons identified as having expertise in the area.. There is considerable evidence to indicate that exposure to pure crystalline silica will result in a number of disease outcomes including silicosis, lung cancer, tuberculosis, chronic airways disease, auto-immune diseases and nephrotoxicity.. Of these disease outcomes, silicosis and lung cancer were considered to be the most relevant to this study.. ...
https://www.coalservices.com.au/mining/about-us/healthy-and-safety-trust/current-projects/review-health-effects-associated-exposure-respirable-crystalline-silica-coal-dust/
The Power of Rust and Sand at the Nanoscale: Iron Oxide and Mesoporous Silica Nanoparticles for Biomedical ApplicationsThe Power of Rust and Sand at the Nanoscale: Iron Oxide and Mesoporous Silica Nanoparticles for Biomedical Applications
Due to their high surface area and size-dependent properties, nanoparticles have seen use as biomedical devices in the past several decades. Magnetic nanoparticles are of particular interest as their properties allow for a variety of uses including separations, targeting, imaging, and therapy. The biological milieu is not a pristine environment, however. The complex medium presents many challenges for particle stability and reproducible performance. It even makes fundamental particle characterization more difficult. In this thesis, magnetic iron oxide nanoparticles are investigated as biomedical devices which provide diagnosis/imaging and therapy (theranostics). Innovative methods for characterizing these particles and observing their behavior over time in biologically relevant environments are also presented. Overall, this thesis aims to make the important point that magnetic nanoparticles are not stagnant objects but are in fact dynamic systems capable of vast changes upon exposure to in vitro ...
https://conservancy.umn.edu/handle/11299/182817
Influence of the temperature-time conditions on the textural and structural properties of mesoporous silicon dioxide...Influence of the temperature-time conditions on the textural and structural properties of mesoporous silicon dioxide...
Read Influence of the temperature-time conditions on the textural and structural properties of mesoporous silicon dioxide synthesized in an ammonia-alcohol medium, Russian Journal of Applied Chemistry on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
https://www.deepdyve.com/lp/springer_journal/influence-of-the-temperature-time-conditions-on-the-textural-and-8q43bMB7Re
Scandinavian Journal of Work, Environment & Health - Radiological pleural changes in nonpneumoconiotic silica-exposed coal...Scandinavian Journal of Work, Environment & Health - Radiological pleural changes in nonpneumoconiotic silica-exposed coal...
Objectives Whether nonpneumoconiotic silica-exposed coal miners develop radiologically recognizable pleural changes was studied.. Methods In a retrospective follow-up study, the oldest and the most recent chest X-rays of 765 workers with a profusion category lower than 1/0 according to the International Labour Office were read.. Results Altogether 720 (94.1%) workers had no abnormalities, and 45 (5.9%) showed some pleural alteration in the first X-ray. In 43 (6%) of the 720 with no initial abnormalities, some pleural change was detected in the last X-ray. There was a statistical difference (P=0.022) according to silica exposure category [low: 5 (2.4%); medium: 8 (6%); high: 30 (8%)]. The relative risk for any pleural alteration was significantly increased in relation to the silica-exposed group [medium: odds ratio (OR) 5.72, 95% confidence interval (95% CI) 1.4-23.5, P=0.016; high: OR 7.62, 95% CI 2.1-27.2, P=0.002] and to rib alterations (OR 3.74, 95% CI 1.4-9.7, P=0.007). In 19 (2.6%) workers ...
https://www.sjweh.fi/show_abstract.php?abstract_id=858
Silica Aerogel as Super Thermal and Acoustic Insulation MaterialsSilica Aerogel as Super Thermal and Acoustic Insulation Materials
Silica aerogels are light weight, nanostructured, and highly porous materials with an open pore structure. Due to their excellent characteristics, such as extremely low thermal conductivity, low density and high porosity, the silica aerogels become promising potential adsorbents, catalysts, thermal insulation, and acoustic absorption materials for environmental purposes. This paper presents the synthesis of a highly flexible polymer modified silica aerogel with the use of a cellulose-methyltriethoxysilane (MTES) precursor in a two-step acid-base catalyzed sol-gel process. The physical properties of the resulting aerogels were characterized by thermogravimetry, scanning electron microscopy, nitrogen adsorption-desorption, contact angle, thermal conductivity measurements, compression testing and Fourier transform infrared spectroscopy. The fabricated aerogel exhibited high flexibility with a Youngs modulus of compression of 0.33 MPa and the density of 0.132 g/cm3. They were hydrophobic in nature and had
https://file.scirp.org/Html/1-6703551_83892.htm
PROCESS FOR THE PREPARATION OF AQUEOUS SILICON DIOXIDE DISPERSIONS FOR ADHESIVE FORMULATIONS - Patent applicationPROCESS FOR THE PREPARATION OF AQUEOUS SILICON DIOXIDE DISPERSIONS FOR ADHESIVE FORMULATIONS - Patent application
0029] Silicic acid sols are colloidal solutions of amorphic silica in water which are also called silicon dioxide sols, but mostly are called just silica sols. The silica in that case is present in the form of spherical and surface-hydroxilated particles. The particle diameter of the colloid particles as a rule is 1 to 200 nm, in which case the specific BET-surface (determined in accordance with the method of G. N. Sears, Analytical Chemistry Vol. 28, No. 12, 1981-1983, December 1956) which correlates with the particle size is 15 to 2,000 m2/g. Assuming that silica sols are presented as spherical primary particles and have a density of 2.2 g/cm3, a factor of 2,750 results. This factor divided by the specific surface gives the particle size in nm. (To determine the factor. see Ralph K. Iler, The Chemistry of Silica, John Wiley & Sons New York 1979 p. 465 ff.). The surface of the SiO2 particles has a load which is balanced by an appropriate counterion, which leads to stabilising of the colloidal ...
http://www.patentsencyclopedia.com/app/20130245163
Crystalline Silica - A Dangerous Dust | MSDSonlineCrystalline Silica - A Dangerous Dust | MSDSonline
In addition to putting a guidance document together, OSHA also initiated a National Emphasis Program (NEP) for crystalline silica in early 2008, Directive CPL 03-00-007, which builds on a 1996 Special Emphasis Program (SEP) for Silicosis. According to OSHA, the purpose of the NEP is to identify and reduce or eliminate the health hazards associated with occupational exposure to crystalline silica.. Regarding compliance, if your company uses materials containing 0.1 percent or more crystalline silica, then you are covered by OSHAs Hazard Communication Standard (HCS, HazCom, 29 CFR 1910) and must provide: material safety data sheets, proper warning labels and employee training.. You must also adhere to the permissible exposure limit (PEL), 29 CFR 1926.55, 1910.1000, that OSHA has set for this hazardous compound. The PEL represents the maximum amount of crystalline silica that employees can be exposed to during an eight-hour work shift. The limit varies by the composition of the airborne dust ...
https://www.msdsonline.com/2009/11/19/crystalline-silica-a-dangerous-dust/
Journal of Food Hygiene and Safety
Silicon dioxide (SiO2) has synonyms such as silica and defined silica aerogel, hydrated silica, silicic acid and dehydrated silica gel. Description of SiO2 is silica aerogel (a microcellular silica occurring as a fluffy powder or granules) and hydrated silica (a precipitated, hydrated SiO2 occurring as fine white, amorphous powder, or as beads or granules). SiO2 is insoluble in water and ethanol and soluble in hydrofluoric acid and alkalis (80-100°C)1,2). Synthetic amorphous silica (SAS) is also known as untreated fumed silica. SiO2 and synthetic amorphous silica are chemically identical. SiO2 in its forms can be used as a direct ingredient in food and as a component of food-packaging materials, at levels in accordance with good manufacturing practices.. When directly added to food, SiO2 has the following uses: anticaking agent, antifoaming agent, stabilizer, adsorbent, carrier, conditioning agent, chill proofing agent, filter aid, emulsifying agent, viscosity control agent, and anti-settling ...
http://www.foodsafety.or.kr/journal/article.php?code=56158
Colloidal Silica - Manufacturers, Suppliers & Exporters in IndiaColloidal Silica - Manufacturers, Suppliers & Exporters in India
Contact verified Colloidal Silica Manufacturers, Colloidal Silica suppliers, Colloidal Silica exporters wholesalers, silica sol casting producers, traders in India.
https://www.exportersindia.com/indian-suppliers/colloidal-silica.htm
What is Silicosis? - Glass BlastWhat is Silicosis? - Glass Blast
Silicosis is the chronic fibrosing disease of the lungs produced by the prolonged and extensive exposure to free crystalline silica dust. When workers inhale crystalline silica (dust), the lung tissue reacts by developing fibrotic nodules and scarring around the trapped silica particles. This fibrotic condition of the lung is called silicosis. If the nodules grow too large, breathing becomes difficult and death may result. Silicosis victims are also at high risk of developing active tuberculosis. More than one million U.S. workers are exposed to crystalline silica, and each year hundreds of these workers die from silicosis. Silicosis treatment is very limited as there is no cure for the disease, but it is 100 percent preventable if employers, workers, and health professionals work together to reduce exposures.. Pneumoconiosis is the general term for lung disease caused by inhalation of mineral dust. Silicosis is a fibrosing lung disease caused by inhalation of dust containing crystalline silica ...
https://www.glassblast.com/silicosis/
Download Colloidal Silica: Fundamentals And Applications 2005Download Colloidal Silica: Fundamentals And Applications 2005
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http://nizarhabash.com/.sessions/freebooks/download-Colloidal-Silica%3A-Fundamentals-and-Applications-2005.php
Effect of silica particle size on the formation of calcium silicate hydrate [C-S-H] using thermal analysis - StrathprintsEffect of silica particle size on the formation of calcium silicate hydrate [C-S-H] using thermal analysis - Strathprints
Calcium silicate hydrate (C-S-H) is made by mixing calcium hydroxide (portlandite), silica and water at two calcium oxide to silica (C/S) ratios, using nano-silica and silica fume. We investigate how silica particle size influences the rate and extent of formation of C-S-H at room temperature by isothermal calorimetry, thermal analysis, Raman spectroscopy and X-ray diffraction. Rate of reaction increases as silica particle size decreases, and is five times greater with nano-silica than with silica fume. Final composition depends only on initial C/S ratio. Compositions at 28 days are estimated from thermogravimetric and X-ray diffraction data. There is a weak maximum in the reaction rate of nanosilica pastes about 20-30 h after mixing. The overall kinetics is well described by a simple exponential (first-order) reaction model. The early-time reaction rate around the rate maximum is described by an Avrami model.. ...
https://strathprints.strath.ac.uk/65785/
Electrochemical removal of segregated silicon dioxide impurities from yttria stabilized zirconia surfaces at elevated...Electrochemical removal of segregated silicon dioxide impurities from yttria stabilized zirconia surfaces at elevated...
Here we report on the electrochemical removal of segregated silicon dioxide impurities from Yttria Stabilized Zirconia (YSZ) surfaces at elevated temperatures studied under Ultra High Vacuum (UHV) conditions. YSZ single crystals were heated in vacuum by an applied 18kHz a.c. voltage using the ionic conductivity of YSZ. The crystals were annealed in vacuum and atmospheres of water or oxygen from 10−5 mbar to 100mbar in the temperature range of 1100°C to 1275°C. The surface was after annealing analyzed by X-ray Photoelectron Spectroscopy (XPS) without exposing the crystal to atmosphere between annealing and XPS analysis. Silicon enrichment of the surface was only observed at oxygen and water vapor partial pressures above 25mbar and 10mbar, respectively. No silicon was observed on crystals annealed in vacuum and at oxygen and water vapor partial pressures below 10mbar. The YSZ seems to get partially electrochemically reduced by the a.c. voltage when no oxidation substances are present. The ...
http://orbit.dtu.dk/en/publications/electrochemical-removal-of-segregated-silicon-dioxide-impurities-from-yttria-stabilized-zirconia-surfaces-at-elevated-temperatures
Patent US7250378 - Method of depositing a silicon dioxide-comprising layer in the fabrication ... - Google PatentsPatent US7250378 - Method of depositing a silicon dioxide-comprising layer in the fabrication ... - Google Patents
This invention includes methods of depositing a silicon dioxide comprising layer in the fabrication of integrated circuitry, and to methods of forming trench isolation in the fabrication of integrated circuitry. In one implementation, a method of depositing a silicon dioxide comprising layer in the fabrication of integrated circuitry includes flowing an aluminum containing organic precursor to a chamber containing a semiconductor substrate effective to deposit an aluminum comprising layer over the substrate. An alkoxysilanol is flowed to the substrate comprising the aluminum comprising layer within the chamber effective to deposit a silicon dioxide comprising layer over the substrate. At least one halogen is provided within the chamber during at least one of the aluminum containing organic precursor flowing and the alkoxysilanol flowing under conditions effective to reduce rate of the deposit of the silicon dioxide comprising layer over the substrate than would otherwise occur under identical conditions
http://www.google.com/patents/US7250378?dq=5572193
Image Sensors World: October 2013Image Sensors World: October 2013
A photon with a vacuum wavelength of 250 nm has energy of approximately 5 eV. The bandgap of silicon dioxide is about 10 eV. Although it would appear that such wavelength photons cannot be absorbed by silicon dioxide, silicon dioxide as grown on a silicon surface must have some dangling bonds at the interface with the silicon because the silicon dioxide structure cannot perfectly match that of the silicon crystal. Furthermore, because the single dioxide is amorphous, there are likely also some dangling bonds within the material. In practice, there will be a non-negligible density of defects and impurities within the oxide, as well as at the interface to underlying semiconductor, that can absorb photons with deep UV wavelengths, particularly those shorter than about 250 nm in wavelength. Furthermore, under high radiation flux density, two high-energy photons may arrive near the same location within a very short time interval (nanoseconds or picoseconds), which can lead to electrons being excited ...
http://image-sensors-world.blogspot.fi/2013/10/
Silica Gel ChromatographySilica Gel Chromatography
Silica gel chromatography packing is made of monodisperse porous silica microspheres with highly uniform particle size, perfect spherical morphology and optimized pore structure.. Our silica gel chromatography media meets the requirements of high performance liquid chromatography (HPLC) analysis in the laboratory and preparative separations in industry scale. The monodisperse spherical porous silica gel has distinct advantages such as highly uniform particle size, perfect spherical morphology, outstanding mechanical strength, easy column packing, high column efficiency, good resolution, low back pressure and exceptional batch to batch reproducibility. It has already been widely used in analysis and separation of organic compounds, peptides, nucleic acids, antibiotics and low molecular weight pharmaceuticals.. EPRUI Biotech Co. Ltd. supplies highly uniform, ultra pure porous silica microspheres with various particle size ranging from 1.7um to 40um.EPRUI develops new surface bonding and end ...
https://www.epruibiotech.com/product/silica-gel-chromatography/
Latent damage investigation on lateral nonuniform charge generation and stress-induced leakage current in silicon dioxide...
This paper reports on positive lateral nonuniform (LNU) charge generation in silicon dioxide, and its relationship to transient or ac stress-induced leakage current (SILC), for MOS capacitor devices subjected to high-field current impulse stressing using a transmission line pulsing technique. The formation of LNU charge was attributed to the localized injection of avalanche hot carriers from the silicon substrate together with the accompanying impact ionization within the oxide. The short stress pulse duration was identified as an important factor for the generation of LNU charge as a longer duration stress pulse or dc stressing gives rise to more uniform charge trapping. A model, consisting of several similar area and equivalent MOS capacitors connected in parallel, was used to explain the effect of LNU charge generation on the high-frequency capacitance-voltage curves. Electrical annealing results indicate that the positive LNU charge traps are located close to the silicon-oxide interface. The ...
http://scholarbank.nus.edu.sg/handle/10635/62379
Reaction Mechanisms and Rate Limitations in Dry Etching of Silicon Dioxide with Anhydrous Hydrogen FluorideReaction Mechanisms and Rate Limitations in Dry Etching of Silicon Dioxide with Anhydrous Hydrogen Fluoride
A novel dry etching process for silicon dioxide has been developed. This process, carried out at ambient temperature and pressure, uses anhydrous hydrogen fluoride, water vapor in a nitrogen carrier, and a unique processing sequence to achieve etch rates of about 200A/second, with 5 percent or better uniformity.. The overall reaction is a complicated sequence of surface hydration and surface fluorination by adsorption, reaction, and product desorption. This paper presents two proposed reaction mechanisms and describes how experimental data from a laminar flow reactor were used to evaluate the mechanisms. ...
https://www.astm.org/DIGITAL_LIBRARY/STP/PAGES/STP26038S.htm
HS Codes - Reunion vi 28.11.22 - Silicon dioxide (CAS RN 7631-86-9) inHS Codes - Reunion vi 28.11.22 - Silicon dioxide (CAS RN 7631-86-9) in
Lookup HS Codes for Reunion vi 28.11.22 Silicon dioxide (CAS RN 7631-86-9) in the form of powder, for use in the manufacture of high performance liquid chromatography columns (HPLC) and sample preparation cartridges. Avalara LandedCosts helps determine your duty rates and other import taxes for Reunion.
https://www.avalara.com/hs-codes/vi/28/11/22/reunion/
layers of silicon dioxide and hafnium oxide - Virginia Fletcher
On September 6, 2017 by Kenna. Skycool Systems is a Stanford spin-out that uses panels composed of layers of silicon dioxide and hafnium oxide on top of a thin layer of silver to convert the waste-heat from air-conditioners heat exchangers into 8-13 micrometer radiation, which passes through the atmosphere and radiates into space. The companys models predict that using Read More. ...
http://fletcherworkssmart.com/category/layers-of-silicon-dioxide-and-hafnium-oxide/
Germany Silicon dioxide, Germany Bentonite, Germany Aluminium potassium sulfate dodecahydrate, Products Catalog1
We,China Suppliers & China Manufacturers, provide our Products catalog2: Germany Silicon dioxide, Germany Bentonite, Germany Aluminium potassium sulfate dodecahydrate
http://chemnet.com/GermanySuppliers/45921/Products-Catalog--1.html
Comparison of non-crystalline silica nanoparticles in IL-1β release from macrophages | Particle and Fibre Toxicology | Full TextComparison of non-crystalline silica nanoparticles in IL-1β release from macrophages | Particle and Fibre Toxicology | Full Text
Respirable crystalline silica (silicon dioxide; SiO2, quartz) particles are known to induce chronic inflammation and lung disease upon long-term inhalation, whereas non-crystalline (amorphous) SiO2 particles in the submicrometre range are regarded as less harmful. Several reports have demonstrated that crystalline, but also non-crystalline silica particles induce IL-1β release from macrophages via the NALP3-inflammasome complex (caspase-1, ASC and NALP3) in the presence of lipopolysaccharide (LPS) from bacteria. Our aim was to study the potential of different non-crystalline SiO2 particles from the nano- to submicro-sized range to activate IL-1β responses in LPS-primed RAW264.7 macrophages and primary rat lung macrophages. The role of the NALP3-inflammasome and up-stream mechanisms was further explored in RAW264.7 cells. In the present study, we have shown that 6 h exposure to non-crystalline SiO2 particles in nano- (SiNPs, 5-20 nm, 50 nm) and submicro-sizes induced strong IL-1β responses in LPS
https://particleandfibretoxicology.biomedcentral.com/articles/10.1186/1743-8977-9-32
UiS Brage: Adsorption of silica nanoparticles in chalk and sandstone and it effect of fluid/rock interactions.UiS Brage: Adsorption of silica nanoparticles in chalk and sandstone and it effect of fluid/rock interactions.
This study addresses the adsorption of Silica nanoparticles (NPs) and its effect on fluid/rock interactions in chalk and sandstone reservoirs. The first part of this thesis addresses the kinetic adsorption behaviour of silica NPs dispersed in three types of waters: deionized water (DIW), low salinity water (LSW) and synthetic seawater (SSW) on calcite and quartz which are the major mineral constituents of chalk and sandstone reservoirs. Kinetic adsorption of NPs was addressed by running a set of static adsorption experiments with increasing mixing time between the mineral and silica nanofluid prepared at three different salinities. Pseudo-first order and Pseudo-second order kinetic models were used to describe to kinetic behaviour of silica NPs on calcite and quartz. Intraparticle diffusion model is used to describe the adsorption mechanism of silica NPs on calcite and quartz. Ion and pH analysis was performed to study the fluid/rock interactions with and without NPs. The second part of the ...
https://uis.brage.unit.no/uis-xmlui/handle/11250/2568979?locale-attribute=en
Assessment of occupational exposure to the respirable fraction of cement dust and crystalline silica - Health and Safety at...
Introduction: Exposure to respirable fraction of cement dust and its crystalline silica content is the most important occupational risk factor in cement industries requiring more evaluation and monitoring. This study aimed to assess exposure to crystalline silica and cement dust among workers of a cement industry in Saveh city, Iran. . Material ...
https://jhsw.tums.ac.ir/browse.php?a_id=5019&slc_lang=en&printcase=1&hbnr=1&hmb=1
Granite Paving Stone - Import & Export Granite Paving Stone Catalog - ECVV China
Import and Export Granite Paving Stone from China, USA, UK, Australia, India, Pakistan, Germany and other countries. Granite Paving Stone include Granite Tombstone, Granite Monument, Granite Fireplace, Granite Sculpture, Granite Cube Stone, Granite Kerbstone, Granite Paving Stone, Granite Tile, Granite Slab, Granite Cobble, Granite Mushroom Stone and Granite Step Stone. ECVV, a reliable place for international trade.
https://catalog.ecvv.com/Granite/Granite-Paving-Stone/
Protein characterization using SEC: three webinar takeaways
There are mainly two types of SEC resins available: silica-based resins and agarose-based resins. Properties of silica-based and agarose-based resins are listed in Table 1. The main difference, which has a practical impact, is that agarose-based resins have much higher pH stability and can thus be cleaned under harsh conditions. Standard protocols for cleaning of agarose-based resins include NaOH. Silica-based resins, on the other hand, decompose at high pH, preventing the use of NaOH in cleaning of these resins. In addition, while agarose has little, if any, tendency to adsorb proteins, silica-based resins might contain residual silanols that can adsorb proteins. Traditionally, agarose-based resins are more commonly used in preparative SEC, while silica-based resins are more used in analytical SEC applications. Today, however, there is a new generation of agarose-based resins available, with smaller, more rigid beads. These resins offer a good complement to the silica-based resins for protein ...
http://proteins.gelifesciences.com/protein-blog-and-news/protein-skills-blog/protein-characterization-using-SEC-three-webinar-takeaways
Asbestos Abatement and Mold Removal: July 2009Asbestos Abatement and Mold Removal: July 2009
Silica exposure remains a serious threat to nearly 2 million U.S. workers, including more than 100,000 workers in high risk jobs such as abrasive blasting, foundry work, stonecutting, rock drilling, quarry work and tunneling. The seriousness of the health hazards associated with silica exposure is demonstrated by the fatalities and disabling illnesses that continue to occur in sandblasters and rockdrillers. Crystalline silica has been classified as a human lung carcinogen. Additionally, breathing crystalline silica dust can cause silicosis, which in severe cases can be disabling, or even fatal. The respirable silica dust enters the lungs and causes the formation of scar tissue, thus reducing the lungs ability to take in oxygen. There is no cure for silicosis. Since silicosis affects lung function, it makes one more susceptible to lung infections like tuberculosis. In addition, smoking causes lung damage and adds to the damage caused by breathing silica dust ...
http://moldandasbestos.blogspot.com/2009/07/
Particle size effect on enantioselective hydrogenation of methylacetoacetate over silica-supported nickel catalyst<...
TY - JOUR. T1 - Particle size effect on enantioselective hydrogenation of methylacetoacetate over silica-supported nickel catalyst. AU - Fu, L.. AU - Kung, H. H.. AU - Sachtler, W. M.H.. N1 - Funding Information: This work was supported by the National Science Foundation, under grand No. CHE-8216664.. PY - 1987/9. Y1 - 1987/9. N2 - The effect of metal particle size on the enantioselective hydrogenation of methylacetoacetate (MAA) to methyl 3-hydroxybutyrate (MHB) in the gas and the liquid phases was studied over Ni/SiO2 modified with R,R tartaric acid. The Ni particle size of the catalyst at controlled Ni load was increased from 3.3 nm up to about 11 nm by Ostwald ripening, due to the formation and decomposition of gaseous Ni(CO)4. The experimental data showed no significant particle size effect on enantioselectivity within this size range. Atomic absorption analysis of the solution after modification showed that up to 50% of the Ni in the catalyst can be leached out during modification under ...
https://www.scholars.northwestern.edu/en/publications/particle-size-effect-on-enantioselective-hydrogenation-of-methyla
Magnetic silica spheres with large nanopores for nucleic acid adsorption and cellular uptakeMagnetic silica spheres with large nanopores for nucleic acid adsorption and cellular uptake
Liu, J. and Wang, B. and Hartono, S. and Liu, T. and Kantharidis, P. and Middelberg, A. and Lu, G. et al. 2012. Magnetic silica spheres with large nanopores for nucleic acid adsorption and cellular uptake. Biomaterials. 33 (3): pp. 970-978 ...
https://espace.curtin.edu.au/handle/20.500.11937/49394
Household Products Database - Health and Safety Information on Household Products
The International Agency for Research on Cancer (IARC) has determined that crystalline silica in the form of quartz or cristobalite that is inhaled from occupational sources is carcinogenic to humans (Group 1- carcinogenic to humans). Refer to IARC Monograph 68, Silica, Some Silicates and Organic Fibres (published in June 1997) in conjunction with the use of these materials. The National Toxicology Program (NTP) classifies respirable crystalline silica as ***known to be a human carcinogen***. Refer to the 9th Report on Carcinogens (2000). The American Conference of Governmental Industrial Hygienists (ACGIH) classifies crystalline silica, quartz, as a suspected human carcinogen (Group A2). Breathing dust containing respirable crystalline silica may not cause noticeable injury or illness even though permanent lung damage may be occurring. Inhalation of dust may have the following serious chronic health effects: Excessive inhalation of respirable dust can cause pneumoconiosis, a respiratory ...
https://hpd.nlm.nih.gov/cgi-bin/household/brands?tbl=brands&id=4008127
Patente US6037104 - Methods of forming semiconductor devices and methods of forming field ... - Google PatentesPatente US6037104 - Methods of forming semiconductor devices and methods of forming field ... - Google Patentes
In one aspect the invention includes a method of forming a semiconductor device, comprising: a) forming a layer over a substrate; b) forming a plurality of openings extending into the layer; c) depositing particles on the layer; d) collecting the particles within the openings; and e) using the collected particles as a mask during etching of the underlying substrate to define features of the semiconductor device. In another aspect, the invention includes a method of forming a field emission display, comprising: a) forming a silicon dioxide layer over a conductive substrate; b) forming a plurality of openings extending into the silicon dioxide layer; c) depositing particles on the silicon dioxide layer; d) collecting the particles within the openings; e) while using the collected particles as a mask, etching the conductive substrate to form a plurality of conically shaped emitters from the conductive substrate; and f) forming a display screen spaced from said emitters.
http://www.google.es/patents/US6037104?dq=flatulence
Silicon dioxideSilicon dioxide
... could be grown on a silicon semiconductor surface. Silicon oxide layers could protect silicon surfaces during ... Silicon dioxide has been researched for agricultural applications as a potential insecticide. Silicon dioxide is mostly ... Colloidal silicon dioxide Dicalite DRI-DIE Insecticide 67 FLO-GARD Fossil flour Fumed silica Fumed silicon dioxide HI-SEL LO- ... typically today layered with some other dielectrics like silicon nitride. Because silicon dioxide is a native oxide of silicon ...
https://en.wikipedia.org/wiki/Silicon_dioxide
TelevisionTelevision
Atalla, M.; Kahng, D. (1960). "Silicon-silicon dioxide field induced surface devices". IRE-AIEE Solid State Device Research ... "1960 - Metal Oxide Semiconductor (MOS) Transistor Demonstrated". The Silicon Engine. Computer History Museum. Retrieved 29 July ...
https://en.wikipedia.org/wiki/Television
Liquid-crystal displayLiquid-crystal display
Atalla, M.; Kahng, D. (1960). "Silicon-silicon dioxide field induced surface devices". IRE-AIEE Solid State Device Research ... "1960 - Metal Oxide Semiconductor (MOS) Transistor Demonstrated". The Silicon Engine. Computer History Museum. Retrieved July 29 ... Low Temperature Poly Silicon) LCDs are made, by AUO Archived June 6, 2021, at the Wayback Machine Development of Liquid Crystal ... suggested that its effects were theoretically much greater than better-known sources of greenhouse gasses like carbon dioxide. ...
https://en.wikipedia.org/wiki/Liquid-crystal_display
Aluminium phosphateAluminium phosphate
... silicon dioxide. Berlinite looks like quartz and has a structure that is similar to quartz with silicon replaced by Al and P. ... and this mirrors the behaviour of silicon dioxide. There are many types of aluminium phosphate molecular sieves, generically ...
https://en.wikipedia.org/wiki/Aluminium_phosphate
Flat-panel displayFlat-panel display
The Silicon Engine. Computer History Museum. Retrieved 29 July 2019. Atalla, M.; Kahng, D. (1960). "Silicon-silicon dioxide ...
https://en.wikipedia.org/wiki/Flat-panel_display
Diode memoryDiode memory
The devices have been dubbed "one diode-one resistor" (1D-1R). One implementation uses a silicon dioxide chip. The circuits ... Orphaned articles from December 2013, All orphaned articles, Types of RAM, Silicon dioxide, Diodes). ... When electricity passes through a layer of silicon oxide, it strips away oxygen molecules and creates a channel of pure ... metallic-phase silicon less than five nanometers wide. The diodes eliminate the crosstalk inherent in crossbar structures by ...
https://en.wikipedia.org/wiki/Diode_memory
Xianju National ParkXianju National Park
Its silicon dioxide content is over 66%. The park has 101 major geological relics and 24 water views. In the geomorphic ...
https://en.wikipedia.org/wiki/Xianju_National_Park
List of semiconductor scale examplesList of semiconductor scale examples
p. 4. ISBN 0-471-33372-7. Atalla, Mohamed M.; Kahng, Dawon (June 1960). "Silicon-silicon dioxide field induced surface devices ... The i1103 was manufactured on a 6-mask silicon-gate P-MOS process with 8 μm minimum features. The resulting product had a 2,400 ... "IBM claims world's smallest silicon transistor - TheINQUIRER". Theinquirer.net. 2002-12-09. Archived from the original on May ... "Observation of electron velocity overshoot in sub-100-nm-channel MOSFET's in Silicon". IEEE Electron Device Letters. 6 (12): ...
https://en.wikipedia.org/wiki/List_of_semiconductor_scale_examples
Organic field-effect transistorOrganic field-effect transistor
The Silicon Engine. Computer History Museum. Atalla, M.; Kahng, D. (1960). "Silicon-silicon dioxide field induced surface ... Thermally oxidized silicon is a traditional substrate for OFETs where the silicon dioxide serves as the gate insulator. The ... This pentacene oxidation technique is akin to the silicon oxidation used in the silicon electronics. Polycrystalline ... The performance of OFETs, which can compete with that of amorphous silicon (a-Si) TFTs with field-effect mobilities of 0.5-1 ...
https://en.wikipedia.org/wiki/Organic_field-effect_transistor
Television setTelevision set
Atalla, M.; Kahng, D. (1960). "Silicon-silicon dioxide field induced surface devices". IRE-AIEE Solid State Device Research ... "1960 - Metal Oxide Semiconductor (MOS) Transistor Demonstrated". The Silicon Engine. Computer History Museum. Retrieved 29 July ...
https://en.wikipedia.org/wiki/Television_set
Sickle-glossSickle-gloss
Silicon dioxide, History of agriculture, Natufian culture). ...
https://en.wikipedia.org/wiki/Sickle-gloss
Silicon carbonateSilicon carbonate
... is potentially important as a mineral in the mantle of the Earth, as both carbon dioxide and silica are ... Silicon carbonate is a crystalline substance formed under pressure from silica and carbon dioxide. The formula of the substance ... This is made from a stabilised silylone (zeroivalent silicon) which reduces some carbon dioxide to carbon monoxide, but then ... There was also a claim to have made a silicon carbonate with a cristobalite structure, where both carbon and silicon are ...
https://en.wikipedia.org/wiki/Silicon_carbonate
SiliconSilicon
... tetrachloride is manufactured on a huge scale as a precursor to the production of pure silicon, silicon dioxide, and ... Silicon compounds such as silicon carbide are used as abrasives and components of high-strength ceramics. Silicon is the basis ... Silicon and silicon carbide readily react with all four stable halogens, forming the colourless, reactive, and volatile silicon ... Other modifications of silicon dioxide are known in some other minerals such as tridymite and cristobalite, as well as the much ...
https://en.wikipedia.org/wiki/Silicon
Nano-FTIRNano-FTIR
Zhang LM (2012-01-01). "Near-field spectroscopy of silicon dioxide thin films". Physical Review B. 85 (7): 075419. arXiv: ...
https://en.wikipedia.org/wiki/Nano-FTIR
Silica fumeSilica fume
... polymorph of silicon dioxide, silica. It is an ultrafine powder collected as a by-product of the silicon and ferrosilicon alloy ... Wikimedia Commons has media related to Silicon dioxide. Silica Fume Association (Articles with short description, Short ... Early research used an expensive additive called fumed silica, an amorphous form of silica made by combustion of silicon ... With the implementation of tougher environmental laws during the mid-1970s, silicon smelters began to collect the silica fume ...
https://en.wikipedia.org/wiki/Silica_fume
Period (periodic table)Period (periodic table)
Silicon dioxide is the principal constituent of sand. As Carbon is to Biology, Silicon is to Geology. Phosphorus (P) is a ... Silicon (Si) is a metalloid. It is a semiconductor, making it the principal component in many integrated circuits. ...
https://en.wikipedia.org/wiki/Period_(periodic_table)
Silica (disambiguation)Silica (disambiguation)
Silica or silicon dioxide is a chemical compound. Silica may also refer to: Silica gel, a desiccant Silica, Rožňava District, ...
https://en.wikipedia.org/wiki/Silica_(disambiguation)
List of mines in JapanList of mines in Japan
"Kaso Mine, Kanuma City, Tochigi, Japan". Kaso Mine (Manganese, Silicon Dioxide) - Imai, Genichiro, Tochigi. 1947. "Oukura mine ...
https://en.wikipedia.org/wiki/List_of_mines_in_Japan
MOSFETMOSFET
Derick accidentally grew a layer of silicon dioxide over the silicon wafer. Further research showed that silicon dioxide could ... Silicon dioxide has traditionally been used as the gate insulator. Silicon dioxide however has a modest dielectric constant. ... traditionally of silicon dioxide and later of silicon oxynitride. Some companies have started to introduce a high-κ dielectric ... structure is obtained by growing a layer of silicon dioxide (SiO 2) on top of a silicon substrate, commonly by thermal ...
https://en.wikipedia.org/wiki/MOSFET
SimeticoneSimeticone
Simethicone is a mixture of dimethicone and silicon dioxide. The INN name is "simeticone", which was added to the INN ... Silicon, Silicon dioxide, Digestive system, Silicones). ...
https://en.wikipedia.org/wiki/Simeticone
SiloxaneSiloxane
Oxidation of organosilicon compounds, including siloxanes, gives silicon dioxide. This conversion is illustrated by the ... Polysiloxanes (silicones), upon combustion in an inert atmosphere, generally undergo pyrolysis to form silicon oxycarbide or ... "The inertness of silicones toward warmblooded animals has been demonstrated in a number of tests." With an LD50 in rats of >50 ... The main route to siloxane functional group is by hydrolysis of silicon chlorides: 2 R3Si−Cl + H2O → R3Si−O−SiR3 + 2 HCl The ...
https://en.wikipedia.org/wiki/Siloxane
UturuncuUturuncu
Silification is the replacement of rock by silicon dioxide. A diapir is a rock formation, which owing to having a lower density ... The summit fumaroles have temperatures of less than 80 °C (176 °F). Their gases contain large quantities of carbon dioxide, ... water and larger amounts of hydrogen sulfide than sulfur dioxide perhaps due to the latter being filtered out by a hydrothermal ...
https://en.wikipedia.org/wiki/Uturuncu
SilicateinSilicatein
... a silicon dioxide polymer. These inorganic structures provide support for the animals. Silica deposition begins intracellularly ... Silicateins are enzymes which catalyse the formation of biosilica from monomeric silicon compounds (such as silicic acid) ... and mechanistic catalysts for the polycondensation reactions of silicon-compounds. The Venus' flower basket siliceous sponge is ... https://doi.org/10.1073/pnas.95.11.6234 Bullis, Kevin (1 November 2006). "Silicon and Sun". MIT Technology Review. Retrieved 6 ...
https://en.wikipedia.org/wiki/Silicatein
Silicon oxynitrideSilicon oxynitride
High Temperature Materials Division (2001). Silicon nitride and silicon dioxide thin insulating films: proceedings of the sixth ... 1.45 for silicon dioxide and ~2.0 for silicon nitride. This property is useful for gradient-index optics components such as ... Polycrystalline silicon oxynitride ceramics are primarily produced by nitridation of a mixture of Si and silicon dioxide at a ... Thin films of silicon oxynitride can be grown on silicon using a variety of plasma deposition techniques and used in ...
https://en.wikipedia.org/wiki/Silicon_oxynitride
Alvin Van ValkenburgAlvin Van Valkenburg
"Infrared studies on polymorphs of silicon dioxide and germanium dioxide". Journal of Research of the National Bureau of ...
https://en.wikipedia.org/wiki/Alvin_Van_Valkenburg
Vapor etchingVapor etching
Commonly, hydrogen fluoride and xenon difluorides are used to etch silicon dioxide and silicon sacrificial layers respectively ... J. Holmes, P.J Snell (1966). "A vapour etching technique for the photolithography of silicon dioxide". Microelectronics and ... 2 XeF2 (abs) + Si (s) → 2 Xe (g) + 2 F (abs) + Si (s) The flurine bonds with the surface silicon to form silicon tetra fluoride ... After the etchant has been mass transported to the silicon surface, the xenon difluoride is absorbed on the silicon surface. 2 ...
https://en.wikipedia.org/wiki/Vapor_etching
SilicaliteSilicalite
It is one of several forms (polymorphs) of silicon dioxide. It is a white solid. It consists of tetrahedral silicon centers and ... Unlike conventional polymorphs of titanium dioxide, the Ti centers in titanium silicalite have tetrahedral coordination ...
https://en.wikipedia.org/wiki/Silicalite
Gate dielectricGate dielectric
The earliest gate dielectric used in a field-effect transistor was silicon dioxide (SiO2). The silicon and silicon dioxide ... For silicon-substrate FETs, the gate dielectric is almost always silicon dioxide (called "gate oxide"), since thermal oxide has ... Silicon dioxide remains the standard gate dielectric in MOSFET technology. QBD (electronics) Kooi†, E.; Schmitz, A. (2005). " ...
https://en.wikipedia.org/wiki/Gate_dielectric
The Disappearing SpoonThe Disappearing Spoon
Silicon dioxide can be fatal and carbon dioxide is not. Moving forward in this chapter Kean starts to describe Germanium and ... Next, Kean describes silicon. In general, he states that they are cousins because silicon mimics carbon in the sense that it ... The big issue that silicon encounters is that silicon does not have the life-sustaining abilities like carbon to attach to ... Unfortunately for Germanium, silicon provided a much better use for electronics and was used when men were sent to the moon and ...
https://en.wikipedia.org/wiki/The_Disappearing_Spoon
Local oxidation nanolithographyLocal oxidation nanolithography
Subsequently, a pattern of silicon dioxide is defined by LON. The SMM molecules are predominantly deposited on the oxide ... first observed by Dagata and co-workers in 1990 who locally modified a hydrogen-terminated silicon surface into silicon dioxide ... LON also allows to fabricate Silicon Nanowires (SiNWs) in a top-down fashion starting from silicon on insulator (SOI) wafers. ... this technique is compatible with the standard silicon CMOS processing technology. Single crystalline silicon nanowires have ...
https://en.wikipedia.org/wiki/Local_oxidation_nanolithography
List of food additivesList of food additives
Sesame seed - Shellac - glazing agent Silicon dioxide - anti-caking agent Silver - color (silver) Luohanguo Sodium acetate - ... Carbon dioxide - acidity regulator, propellant Cardamom - carmines - color (red) Carmoisine - color (red) (FDA: Ext D&C Red #10 ... Sulfur dioxide - preservative, antioxidant Sulfuric acid - acidity regulator Sumac - Sunflower oil - a common cooking oil, also ... Chlorine dioxide - flour treatment agent Chlorine - flour treatment agent Chlorophylls and Chlorophyllins - color (green) ...
https://en.wikipedia.org/wiki/List_of_food_additives
Differential interference contrast microscopyDifferential interference contrast microscopy
... silicon dioxide, silicon nitride and polycrystalline silicon), and defects in them or contamination lying on top of them become ... One non-biological area where DIC is used is in the analysis of planar silicon semiconductor processing. The thin (typically ... 100-1000 nm) films in silicon processing are often mostly transparent to visible light (e.g., ...
https://en.wikipedia.org/wiki/Differential_interference_contrast_microscopy
Gordon MooreGordon Moore
"The Fairchild Chronicles: DVD tells tale of Silicon Valley's seminal startup". Stanford News Service. March 8, 2005. Retrieved ... Moore, Gordon Earle (1954). I. Infrared Studies of Nitrous Acid, The Chloramines and Nitrogen Dioxide II. Observations ...
https://en.wikipedia.org/wiki/Gordon_Moore
FET amplifierFET amplifier
They fabricated the device in November 1959, and presented it as the "silicon-silicon dioxide field induced surface device" in ... Atalla, M.; Kahng, D. (1960). "Silicon-silicon dioxide field induced surface devices". IRE-AIEE Solid State Device Research ... Deal, Bruce E. (1998). "Highlights Of Silicon Thermal Oxidation Technology". Silicon materials science and technology. The ... with the use of thermally oxidized silicon. He proposed that the MOS process could be used to build the first working silicon ...
https://en.wikipedia.org/wiki/FET_amplifier
NeodymiumNeodymium
The sum of all elements per 106 parts of silicon is 2.6682×1010 parts; lead comprises 3.258 parts. "Standard Atomic Weights: ... The ore, after being crushed and ground, is first treated with hot concentrated sulfuric acid, evolving carbon dioxide, ... hydrogen fluoride, and silicon tetrafluoride. The product is then dried and leached with water, leaving the early lanthanide ... Neodymium compounds Lanthanides Period 6 elements Rare earth metals Abundances in the source are listed relative to silicon ...
https://en.wikipedia.org/wiki/Neodymium
Bloom EnergyBloom Energy
Data from the state of Delaware found that Bloom's fuel cells produce about 823 pounds of carbon dioxide per megawatt hour. ... According to the San Francisco Chronicle, that year Bloom had "a coming-out party packed with politicians and Silicon Valley ... Baker, David (July 25, 2018). "Bloom Energy, Silicon Valley fuel-cell unicorn, has a high-powered IPO". SFChronicle.com. ... Fehrenbacher, Katie (October 6, 2016). "Silicon Valley fuel cell maker Bloom Energy has filed for an IPO". Fortune. Retrieved ...
https://en.wikipedia.org/wiki/Bloom_Energy
CapacitorCapacitor
Klein, N.; Gafni, H. (1966). "The maximum dielectric strength of thin silicon oxide films". IEEE Transactions on Electron ... Tantalum electrolytic capacitors with solid manganese dioxide electrolyte are limited by ripple current and generally have the ... "1960: Metal Oxide Semiconductor (MOS) Transistor Demonstrated". The Silicon Engine: A Timeline of Semiconductors in Computers. ...
https://en.wikipedia.org/wiki/Capacitor
Baigong pipesBaigong pipes
... and large amounts of silicon dioxide and calcium oxide. Because any metallurgical analysis reports the composition of a ...
https://en.wikipedia.org/wiki/Baigong_pipes
Self-aligned gateSelf-aligned gate
A thin layer of insulator material (silicon dioxide) is then grown on top of the wafer. Finally, the gate is patterned on top ... poly-silicon), the so-called silicon-gate technology (SGT) or "self-aligned silicon-gate" techology, which had many additional ... a switch from amorphous silicon to polycrystalline silicon (because amorphous silicon would break where it passed over "steps" ... The process continues with vapor deposition of silicon dioxide to protect the exposed areas, and with all the remaining steps ...
https://en.wikipedia.org/wiki/Self-aligned_gate
Zinc deficiencyZinc deficiency
Recent research findings suggest that increasing atmospheric carbon dioxide concentrations will exacerbate zinc deficiency ... Silicon, Vanadium, and Zinc. National Academy Press. 2001. Prasad AS (June 2012). "Discovery of human zinc deficiency: 50 years ...
https://en.wikipedia.org/wiki/Zinc_deficiency
Glass electrodeGlass electrode
There are two main glass-forming systems: silicate matrix based on a molecular network of silicon dioxide (SiO2) with additions ...
https://en.wikipedia.org/wiki/Glass_electrode
List of minerals recognized by the International Mineralogical Association (T)List of minerals recognized by the International Mineralogical Association (T)
... thorium dioxide) Thorikosite (IMA1984-013) 3.DC.40 [333] [334] [335] (IUPAC: trilead trioxide antimony(III) hydro dichloride) ... tricalcium silicon hexahydro carbonate sulfate dodecahydrate) Thebaite-(NH4) (IMA2020-072) 10.0 [284] [no] [no] Theisite ( ...
https://en.wikipedia.org/wiki/List_of_minerals_recognized_by_the_International_Mineralogical_Association_(T)
Hydrated silicaHydrated silica
... is a form of silicon dioxide, which has a variable amount of water in the formula. When dissolved in water it ...
https://en.wikipedia.org/wiki/Hydrated_silica
Electronic personal dosimeterElectronic personal dosimeter
Gate oxide of MOSFET which is conventionally silicon dioxide is an active sensing material in MOSFET dosimeters. Radiation ... Alternate high-k gate dielectrics like Hafnium oxide, Hafnium dioxide and Aluminum oxides are also proposed as a radiation ...
https://en.wikipedia.org/wiki/Electronic_personal_dosimeter
Photonic integrated circuitPhotonic integrated circuit
For instance, silica (silicon dioxide) based PICs have very desirable properties for passive photonic circuits such as AWGs ( ... silica on silicon, silicon on insulator, various polymers and semiconductor materials which are used to make semiconductor ... is an organisation specialising in silicon nitride (SiN) AMF (Singapore) and VTT (Finland) are foundries for silicon photonics ... Silicon nitride (SiN) PICs have a vast spectral range and ultra low-loss waveguide. This makes them highly suited to detectors ...
https://en.wikipedia.org/wiki/Photonic_integrated_circuit
Samuel Graham (engineer)Samuel Graham (engineer)
... gallium oxide and hafnium dioxide), and how they interact with their substrates (including silicon carbide). Such materials are ...
https://en.wikipedia.org/wiki/Samuel_Graham_(engineer)
Infrared atmospheric sounding interferometerInfrared atmospheric sounding interferometer
The IASI spectral range has been chosen such that the instrument can record data from the following ranges: carbon dioxide ... Michelson Interferometer that has the general structure of the Michelson Interferometer, but two silicon carbide cube corner ...
https://en.wikipedia.org/wiki/Infrared_atmospheric_sounding_interferometer
Strontium titanateStrontium titanate
High-quality, epitaxial SrTiO3 layers can also be grown on silicon without forming silicon dioxide, thereby making SrTiO3 an ... R. A. McKee; F. J. Walker & M. F. Chisholm (1998). "Crystalline Oxides on Silicon: The First Five Monolayers". Phys. Rev. Lett ... This also enables the integration of other thin film perovskite oxides onto silicon. SrTiO3 has been shown to possess ...
https://en.wikipedia.org/wiki/Strontium_titanate
High-nutrient, low-chlorophyll regionsHigh-nutrient, low-chlorophyll regions
The bloom would then die off and presumably sink to the deep ocean, taking much of the absorbed carbon dioxide to the seafloor ... Pondaven, P.; Ruiz-Pino, D.; Druon, J.N.; Fravalo, C.; Tréguer, P. (1999). "Factors controlling silicon and nitrogen ... Sequestering carbon dioxide on the ocean floor could destroy the unstudied ecosystem and cause undiscovered lifeforms to go ... The generally lower net primary production in HNLC zones results in lower biological draw-down of atmospheric carbon dioxide ...
https://en.wikipedia.org/wiki/High-nutrient,_low-chlorophyll_regions
Acheson processAcheson process
The process consists of heating a mixture of silicon dioxide (SiO2), in the form of silica or quartz sand, and carbon, in its ... In the furnace, the silicon dioxide, which sometimes also contains other additives along with ferric oxide and saw dust is ... The first light-emitting diodes were produced using silicon carbide from the Acheson process. The potential use of silicon ... Many current silicon carbide plants use the same basic design as the first Acheson plant. In the first plant, sawdust and salt ...
https://en.wikipedia.org/wiki/Acheson_process
ZirconZircon
... silicon ions in fourfold coordination with oxygen ions) and zirconium ions, with the large zirconium ions in eightfold ... but also to all compounds of zirconium including zirconium dioxide (ZrO2), an important refractory oxide with a melting point ...
https://en.wikipedia.org/wiki/Zircon
ChertChert
... the mineral form of silicon dioxide (SiO2). Chert is characteristically of biological origin, but may also occur inorganically ... where carbon dioxide was trapped, producing an environment supersaturated with silica and undersaturated with calcium carbonate ... and which contains the silicon skeletal remains of diatoms, silicoflagellates, and radiolarians. Precambrian cherts are notable ...
https://en.wikipedia.org/wiki/Chert
Michael GrätzelMichael Grätzel
Graetzel cell-based batteries are more convenient for consumer compared to silicon-based photocells - they could be made ... "Dye-Sensitized Titanium Dioxide". Archived from the original on 25 November 2010. Graetzel, M. (1981). "Artificial ...
https://en.wikipedia.org/wiki/Michael_Grätzel
Ultra-high-temperature ceramicsUltra-high-temperature ceramics
It has been shown that diboride ceramics synthesized as a composite with silicon carbide (SiC) exhibit increased fracture ... thorium dioxide (ThO2), tantalum carbide (TaC) and their associated composites. Beginning in the early 1960s, demand for high- ... Current research targets increasing their toughness and oxidation resistance by exploring composites with silicon carbide, the ... 2010). "Microstructure, mechanical properties and thermal shock resistance of zirconium diboride containing silicon carbide ...
https://en.wikipedia.org/wiki/Ultra-high-temperature_ceramics
List of inorganic compoundsList of inorganic compounds
H2SiF6 Silicon boride - SiB3 Silicon carbide (carborundum) - SiC Silicon dioxide - SiO2 Silicon monoxide - SiO Silicon nitride ... Si3N4 Silicon tetrabromide - SiBr4 Silicon tetrachloride - SiCl4 Silicon tetrafluoride - SiF4 Silicon tetraiodide - SiI4 ... Ga2O3 Germanium dioxide - GeO2 Gold(III) oxide - Au2O3 Hafnium dioxide - HfO2 Holmium(III) oxide - Ho2O3 Indium(I) oxide - In2O ... Br2O Carbon dioxide - CO2 Carbon monoxide - CO Cerium(IV) oxide - CeO2 Chlorine dioxide - ClO2 Chlorine trioxide - ClO3 ...
https://en.wikipedia.org/wiki/List_of_inorganic_compounds
BiofoulingBiofouling
... contributes to adverse environmental effects and is predicted to increase emissions of carbon dioxide and sulfur dioxide ... which consists of a non-polar backbone made of repeating units of silicon and oxygen atoms. The non-polarity of PDMS allows for ... contributes to adverse environmental effects and is predicted to increase emissions of carbon dioxide and sulfur dioxide ...
https://en.wikipedia.org/wiki/Biofouling
Gas metal arc weldingGas metal arc welding
Concentrations of carbon dioxide and ozone can prove dangerous if ventilation is inadequate. Other precautions include keeping ... All commercially available electrodes contain deoxidizing metals such as silicon, manganese, titanium and aluminum in small ... In 1953, the use of carbon dioxide as a welding atmosphere was developed, and it quickly gained popularity in GMAW, since it ... Helium also sometimes serves as the base gas, with small amounts of argon and carbon dioxide added. However, because it is less ...
https://en.wikipedia.org/wiki/Gas_metal_arc_welding
Ene reactionEne reaction
... the allenic hydrogen atom α to the silicon substituent is the one transferred, affording a silylalkyne. Phenol can act as an ... kinetic data and computational studies indicate that thermolysis of but-3-enoic acid to give propene and carbon dioxide ... can take place when thermodynamically stable molecules like carbon dioxide or dinitrogen are extruded. For instance, ...
https://en.wikipedia.org/wiki/Ene_reaction
HemeHeme
"Silicon Valley gets a taste for food". The Economist. 2015-03-05. ISSN 0013-0613. Retrieved 2019-04-08. Maines, Mahin D. (July ... Hemoglobin reversibly binds to oxygen in the lungs when the pH is high, and the carbon dioxide concentration is low. When the ... "Concerning a Biologically Important Relationship - The Influence of the Carbon Dioxide Content of Blood on its Oxygen Binding ... situation is reversed (low pH and high carbon dioxide concentrations), hemoglobin will release oxygen into the tissues. This ...
https://en.wikipedia.org/wiki/Heme
Plasmonic metamaterialPlasmonic metamaterial
An insulating sheet of silicon nitride was covered by a film of silver and underlain by another of gold. The critical dimension ... The switch is made of a metamaterial consisting of nanoscale particles of vanadium dioxide (VO 2), a crystal that switches ... Exposing strips of nickel and gold deposited on a polymer/silicon substrate to air allowed mechanical stresses to curl the ... The device is compatible with current integrated circuit technology, silicon-based chips and high-K dielectrics materials. It ...
https://en.wikipedia.org/wiki/Plasmonic_metamaterial
Browsing by Subject Silicon DioxideBrowsing by Subject "Silicon Dioxide"
Rapport portant sur les effets de linhalation de poussières minérales relativement riches en silice ou de mélanges de poussières qui se dégagent lors de lextraction et du traitement de la houille. Considérant la ...
https://extranet.who.int/iris/restricted/browse?authority=Silicon+Dioxide&type=mesh
ELECTRON STATES IN ALPHA-QUARTZ (SILICON DIOXIDE). - Nokia Bell LabsELECTRON STATES IN ALPHA-QUARTZ (SILICON DIOXIDE). - Nokia Bell Labs
Nokia sites use cookies to improve and personalize your experience and to display advertisements. The sites may also include cookies from third parties. By using this site, you consent to the use of cookies. Learn more ...
https://www.bell-labs.com/institute/publications/bl7790252/
Techmeme: Intel says goodbye to Silicon Dioxide in new 45 nanometer fab (Robert Scoble/ScobleShow)Techmeme: Intel says goodbye to Silicon Dioxide in new 45 nanometer fab (Robert Scoble/ScobleShow)
Tom Sanders / Silicon Valley Sleuth:. Intels revolutionary 45nm evolution. Michael Rose / The Unofficial Apple Weblog:. Intel ... Discussion: Gizmodo, Silicon Valley Sleuth, The Unofficial Apple Weblog, FanBoy TechWeb and digg ...
https://www.techmeme.com/070128/p3
Advanced silicon dioxide etch (AOE) with photolithography: ViewAdvanced silicon dioxide etch (AOE) with photolithography: View
If you are interested in this process, either by itself or as part of a longer processing sequence, please send us email at [email protected] or call us at (703) 262- ...
https://mems-exchange.org/catalog/P3316/
silicon dioxidesilicon dioxide
Home » silicon dioxide. Articles tagged with: silicon dioxide. Tech». NASA researchers reveal various applications of atomic ... Tags: art and technology, atomic oxygen, coating technology, NASA, silicon dioxide, technology ...
https://www.robaid.com/tag/silicon-dioxide
silicon dioxide Robot,Robot Tech,Robot Industry,Environment,Low Casilicon dioxide Robot,Robot Tech,Robot Industry,Environment,Low Ca
Silicon Dioxide SiO2 powder CAS 7631-86-9. Item No.: TR-SiO2 Silicon dioxide, also known as silica, is an oxide of silicon with ... What is silicon dioxide used for?. Silicon dioxide is the most abundant mineral in the earths crust. It is found on all ... What is Colloidal Silicon Dioxide?. What is colloidal silicon dioxide?Colloidal silica is a gaseous silica prepared by ... Item No.: TR-SiO2 Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula SiO2. Silica such as ...
https://www.it-chuiko.com/tags/silicon-dioxide.html
Silicon Dioxide Tgt 3X.250 4N5 ESPI MetalsSilicon Dioxide Tgt 3X.250 4N5 ESPI Metals
Ultrabroadband transmission measurements on waveguides of silicon-rich silicon dioxide - ePrints SotonUltrabroadband transmission measurements on waveguides of silicon-rich silicon dioxide - ePrints Soton
Ultrabroadband transmission measurements on waveguides of silicon-rich silicon dioxide. We report ultrabroadband measurements ... We report ultrabroadband measurements on waveguides of photoluminescent silicon-rich silicon dioxide produced by plasma ... Ultrabroadband transmission measurements on waveguides of silicon-rich silicon dioxide. ... Ultrabroadband transmission measurements on waveguides of silicon-rich silicon dioxide. Applied Physics Letters, 83 (22), 4598- ...
https://eprints.soton.ac.uk/259280/
Influence of polyvinylpyrrolidone, microcrystalline cellulose and colloidal silicon dioxide on technological characteristics of...Influence of polyvinylpyrrolidone, microcrystalline cellulose and colloidal silicon dioxide on technological characteristics of...
... microcrystalline cellulose and colloidal silicon dioxide on technological characteristics of a high-dose Petiveria alliacea ... Silicon. 14 Si 28.085500000 Silicon See more Silicon products. Silicon (atomic symbol: Si, atomic number: 14) is a Block P, ... Silica (or silicon dioxide), as sand, is a principal ingredient of glass, one of the most inexpensive of materials with ... The silicon atom has a radius of 111 pm and a Van der Waals radius of 210 pm. Silicon was discovered and first isolated by Jöns ...
https://www.americanelements.com/influence-of-polyvinylpyrrolidone-microcrystalline-cellulose-and-colloidal-silicon-dioxide-on
Thermal contact resistance across nanoscale silicon dioxide and silicon interface | [email protected]
Silicon dioxide and silicon (SiO 2/Si) interface plays a very important role in semiconductor industry. However, at nanoscale, ... Chen, J., Zhang, G., Li, B. (2012-09-15). Thermal contact resistance across nanoscale silicon dioxide and silicon interface. ... of a heterojunction composed of amorphous silicon dioxide and crystalline silicon by using molecular dynamics simulations. ... for the design of silicon nanowire based nano electronics and photonics devices. © 2012 American Institute of Physics. ...
https://scholarbank.nus.edu.sg/handle/10635/98351
Novel nanoscale resist using 10-undecanoic acid monolayers on silicon dioxide<...
Novel nanoscale resist using 10-undecanoic acid monolayers on silicon dioxide. Michael Kozicki, S. J. Yang, T. Kim, B. Kardynal ... Novel nanoscale resist using 10-undecanoic acid monolayers on silicon dioxide. / Kozicki, Michael; Yang, S. J.; Kim, T. et al. ... Kozicki M, Yang SJ, Kim T, Kardynal B. Novel nanoscale resist using 10-undecanoic acid monolayers on silicon dioxide. ... Kozicki, M, Yang, SJ, Kim, T & Kardynal, B 1999, Novel nanoscale resist using 10-undecanoic acid monolayers on silicon dioxide ...
https://asu.pure.elsevier.com/en/publications/novel-nanoscale-resist-using-10-undecanoic-acid-monolayers-on-sil
SILICON DIOXIDE, amorphous, HEXAMETHYLDISILAZANE TREATED | Gelest, Inc.SILICON DIOXIDE, amorphous, HEXAMETHYLDISILAZANE TREATED | Gelest, Inc.
Silicones. Reactive Silicones. Silicone Fluids: Stable, Inert Media. Silanes and Silicones for Epoxy Resins. Performance (Pre- ... Silicon-Based Blocking Agents. Silicon-Based Cross-Coupling Agents. Silicon-Based Reducing Agents. Specialty Olefins. Synthetic ... Silicon Heat Transfer Fluids. Silicon-Based Lubricants. Sol Gel Applications. UV-EB. Microelectronics Overview. Battery ... Silicon-Based Blocking Agents. Silicon-Based Synthetic Reagents. Separations & Diagnostics Overview. Membranes. Microfluidics. ...
https://www.gelest.com/product/SIS6962.0/
Buy Polysiloxane + Silicon Dioxide Online at Lowest Price - OddwayBuy Polysiloxane + Silicon Dioxide Online at Lowest Price - Oddway
Know Polysiloxane + Silicon Dioxide tablets and capsules price, uses, side effects, warnings, precaution at Oddway ... Silicon Dioxide branded and generic alternatives cost online. SHIPPING WORLDWIDE. ...
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Patinal® Silicon Dioxide Granules, About 2.5-4mm, 1Kg, 1.15337.1003 | allscientificPatinal® Silicon Dioxide Granules, About 2.5-4mm, 1Kg, 1.15337.1003 | allscientific
Genuine Patinal Silicon Dioxide, by EMD Millipore, Evaporation Materials, 1Kg Sealed Container, Certificate of Analysis ... Genuine Patinal Silicon Dioxide, by EMD Millipore, Evaporation Materials, 1Kg Sealed Container, Certificate of Analysis ...
https://www.allscientific.com/product-page/patinal-r-silicon-dioxide-granules-about-2-5-4mm-1kg-1-15337-1003
Results of search for 'su:{Silicon dioxide}' › WHO HQ Library catalog
Text; Format: print Publication details: Genève : Organisation mondiale de la Santé, 1986Title translated: Recommended health-based limits in occupational exposure to selected mineral dusts (silica, coal) : report of a WHO study group [meeting held in Geneva from 6 to 12 March 1984].Online access: Click here to access online Availability: Items available for loan: WHO HQ (2)Call number: HQ SERIAL, ... Not available: WHO HQ: Withdrawn (1). ...
https://kohahq.searo.who.int/cgi-bin/koha/opac-search.pl?q=su:%7BSilicon%20dioxide%7D
Synthesizing germanium and silicon nanocrystals embedded in silicon dioxide by magnetron sputtering techniqueSynthesizing germanium and silicon nanocrystals embedded in silicon dioxide by magnetron sputtering technique
... Download ... In this study, silicon and germanium nanocrystals were synthesized in silicon dioxide matrix by magnetron sputtering deposition ... A. S. Alagöz, "Synthesizing germanium and silicon nanocrystals embedded in silicon dioxide by magnetron sputtering technique," ... Si-O-Si asymmetric stretching band is examined by Fourier transform infrared transmission spectroscopy to study silicon dioxide ...
https://open.metu.edu.tr/handle/11511/16872
Silicon Dioxide Manufacturer from HyderabadSilicon Dioxide Manufacturer from Hyderabad
Manufacturer of Silicon Dioxide offered by Adhipathi Minerals & Chemicals Private Limited, Hyderabad, Telangana. ...
https://www.adhipathiminerals.com/new-items.html
Silicon Dioxide - Silver Fern Chemical Inc.Silicon Dioxide - Silver Fern Chemical Inc.
Silicon Dioxide CAS: 7631-86-9 Silicon Dioxide is a white crystalline powder. It occurs naturally in sand, quartz, flint, and ... Request a quote for Silicon Dioxide. First Name. Last Name. Company. Email. Phone. City. State/Province. Message. ... Silicon Dioxide has various applications such as manufacture of concrete, ceramics, and glass, water filtration, cosmetics, ... We have helped multiple customers, from small end users to large Fortune 500 customers, with their Silicon Dioxide supply ...
https://www.silverfernchemical.com/products/silicon-dioxide/
iron silicon dioxide separation by physical separationiron silicon dioxide separation by physical separation
... SiO 2 Silicon dioxide TiO 2 Titanium dioxide Fe 2 O 3 Iron III oxide ... iron silicon dioxide separation by physical separation Traduire cette page SiO 2 Silicon dioxide TiO 2 Titanium dioxide Fe 2 O ... iron silicon dioxide separation by physical separation. iron silicon dioxide separation by physical separation Extraction of ... Aminated silicon dioxide enriching iron. Aminated silicon dioxide enriching iron-containing polyoxometalate catalyst confined ...
https://www.empresadesatascosmadrid.es/installation/4918/iron-silicon-dioxide-separation-by-physical-separation.html
Post-CMP Cleaning of Ceria Particles from Silicon Dioxide and Nitride Wafers for Advanced Technology NodesPost-CMP Cleaning of Ceria Particles from Silicon Dioxide and Nitride Wafers for Advanced Technology Nodes
... we are developing cleaning chemistries than can remove ceria particles from silicon dioxide wafers. The particles on silicon ... Figure 2. Topographic images of adsorbed ceria particles on silicon dioxide wafer surfaces in scan areas of 1 × 1 μm2 (for ~10 ... Due to high chemical affinity of ceria particles to silicon dioxide surfaces, STI CMP leads to particle contamination making ... Figure 1. AFM image of silicon dioxide wafer surface (a) contaminated with ~30 nm (mean diameter) ceria particles and (b) ...
https://www.parksystems.com/learning-center/nano-academy/interviews/1805-post-cmp-cleaning-of-ceria-particles-from-silicon-dioxide-and-nitride-wafers-for-advanced-technology-nodes
Start a new topic on Talk:Silicon dioxideStart a new topic on Talk:Silicon dioxide
Jy100-05 Hydrophobic Silicon Dioxide Powder Price | vinyl wallpaper
Jy100-05 Hydrophobic Silicon Dioxide Powder Price. solution description colon. JY100-05 hydrophobic nano-silica making use of a ...
https://vinyl-wallpaper.top/jy100-05-hydrophobic-silicon-dioxide-powder-price/
Vietnam Silicon Dioxide Original - VTO VNA - Viet Nam - AsianVietnam Silicon Dioxide Original - VTO VNA - Viet Nam - Asian
Silicon, Dioxide, Original, Silica, Sand, Powder, Quartz, Stone, Investment, Commercial, import, export, retail, trading, ...
https://www.vto-vna.com/vietnam-silicon-dioxide-original.html
DailyMed - DARIFENACIN tablet, extended releaseDailyMed - DARIFENACIN tablet, extended release
... colloidal silicon dioxide, talc, magnesium stearate, hypromellose (E15 LV), titanium dioxide, polyethylene glycol 400 and ... colloidal silicon dioxide, talc, magnesium stearate, hypromellose (E15 LV), titanium dioxide, polyethylene glycol 400 and ...
https://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=e84f1ae3-b9a2-4a15-a299-c75373891cc1
silicon dioxide Robot,Robot Tech,Robot Industry,Environment,Low Casilicon dioxide Robot,Robot Tech,Robot Industry,Environment,Low Ca
Silicon Dioxide SiO2 powder CAS 7631-86-9. Item No.: TR-SiO2 Silicon dioxide, also known as silica, is an oxide of silicon with ... What is silicon dioxide used for?. Silicon dioxide is the most abundant mineral in the earths crust. It is found on all ... What is Colloidal Silicon Dioxide?. What is colloidal silicon dioxide?Colloidal silica is a gaseous silica prepared by ... Item No.: TR-SiO2 Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula SiO2. Silica such as ...
https://www.drchristiabrown.com/tags/silicon-dioxide.html
Silicon Dioxide & Arthritis or Fibromyalgia like pain | Cow Shalt NotSilicon Dioxide & Arthritis or Fibromyalgia like pain | Cow Shalt Not
... have had direct experience with silicon dioxide related pain and so I am trying to make the following information available to ... silicon dioxide! Problem is, I also take pain meds for my spine. They contain silicon dioxide! I cant win! My joints hurt all ... silicon dioxide) taken to cope with the painful effects of the previously ingested silicon dioxide so that it becomes a vicious ... Silicon Dioxide is an anti-caking agent that may account for up to 3% of a vitamin formula. It is used in the manufacture of ...
https://jenniemorrow.wordpress.com/2011/10/14/silicon-dioxide-arthritis-or-fibromyalgia-like-pain/
Wholesale The Uses Of Silicon Dioxide Factory and Manufacturers, Suppliers | SainuoWholesale The Uses Of Silicon Dioxide Factory and Manufacturers, Suppliers | Sainuo
The Uses Of Silicon Dioxide Manufacturers, Factory, Suppliers From China, Winning customers trust is definitely the gold key ... The Uses Of Silicon Dioxide. The Uses Of Silicon Dioxide - China Manufacturers, Suppliers, Factory. With our leading technology ... Fused Silica Powder First Grade, aslso Called Silicon Dioxide, with High Purity and Whiteness Sio2 99.9% as Refractory Raw ... we will build a prosperous future together with your esteemed company for The Uses Of Silicon Dioxide, Micron Size Diamond ...
https://www.xzsnfusedquartz.com/the-uses-of-silicon-dioxide/
Antifungal activity of silver/silicon dioxide nanocomposite on the response of faba bean plants (Vicia faba L.) infected by...Antifungal activity of silver/silicon dioxide nanocomposite on the response of faba bean plants (Vicia faba L.) infected by...
In this study, the antifungal role of silver/silicon dioxide nanocomposite (Ag/SiO2NC) biosynthesized using a free-cell ... Silicon (Si) and its nanomaterials could help plants cope with different negative effects of abiotic and/or biotic stresses. ... From: Antifungal activity of silver/silicon dioxide nanocomposite on the response of faba bean plants (Vicia faba L.) infected ...
https://bioresourcesbioprocessing.springeropen.com/articles/10.1186/s40643-022-00591-7/figures/5
Fused silicaMagnesiumSiO2MicrocrystallineColloidalTitaniumMade from silicon dioxideEffects of silicon dioxideCitric AcidIngredientsQuartzPowderCrystallineCapsulesWafer surfaceCarbonNanoparticlesParticle SizeParticlesElectronInsoluble in waterSubstancesHigh PurityCompoundsSodiumIron-siliconInorganicCalciumWaveguidesAnti-cakinEarth's crustCharacteristicsMechanicalCopeSurfaceSprayAtomicMineralOxygen
Fused silica2
  • With our leading technology as well as our spirit of innovation,mutual cooperation, benefits and development, we will build a prosperous future together with your esteemed company for The Uses Of Silicon Dioxide, Micron Size Diamond Powder , Density Of Fused Quartz , Fused Silica Glass Transition Temperature , Micronized Protein Powder . (xzsnfusedquartz.com)
  • High Grade Fused Silica Powder- Micron Powder First Grade High Whiteness with High Purity,Mainly used in Investment Casting, Silicon Rubber. (xzsnfusedquartz.com)
Magnesium2
  • In addition, each capsule contains the following inactive ingredients: colloidal silicon dioxide, croscarmellose sodium, magnesium stearate and microcrystalline cellulose with capsule shell composed of gelatin and titanium dioxide. (drugs.com)
  • Other Ingredients: Hydroxypropyl methylcellulose (vegetable cellulose capsules), cellulose powder, silicon dioxide and vegetable source magnesium stearate. (netnutri.com)
SiO27
  • Item No.: TR-SiO2 Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula SiO2. (it-chuiko.com)
  • Transmission electron microscopy measurements were carried out to analyze annealing effects on nanocrystal size distribution, change in shape, density and localization in silicon dioxide (SiO2). (metu.edu.tr)
  • Lab 2 Physical Separation Techniques Revised 8/19/2009 5 PRESTUDY page 1 of 2 1 5 Using the CRC Handbook of Chemistry and Physicsor other suitable references, look up the following physical properties of ammonium chloride NH4Cl , silicon dioxide SiO2, sand, quartz , and sodium chloride NaCl, table salt. (empresadesatascosmadrid.es)
  • separate iron, calcium carbonate sodium chloride and Nov 26, 2012 Lab 2 PHYSICAL SEPARATION TECHNIQUES Introduction separate mixtures rely on differences in silicon dioxide SiO2, sand , and sodium A student is given a 6216 g mixture of iron filings, calcium chloride »More detailed. (empresadesatascosmadrid.es)
  • This report initiated the idea of the possibility of a controlled nanofabrication of SiO2 on silicon wafer by utilizing a frozen humid air film. (iium.edu.my)
  • Silica, or silicon dioxide (SiO2), can be found in crystalline or amorphous forms. (cdc.gov)
  • Silica is another name for the chemical compound composed of silicon and oxygen with the chemical formula SiO2, or silicon dioxide. (cdc.gov)
Microcrystalline3
  • Influence of polyvinylpyrrolidone, microcrystalline cellulose and colloidal silicon dioxide on technological characteristics of a high-dose Petiveria alliacea tablet. (americanelements.com)
  • This study determined the influence of polyvinylpyrrolidone (PVP), colloidal silicon dioxide (CSD) and microcrystalline cellulose (MC) on the technological characteristic of a high-dose P. alliacea tablet prepared by the wet granulation method. (americanelements.com)
  • Filler (microcrystalline cellulose), anti-caking agent ( silicon dioxide). (dim-support.com)
Colloidal2
  • What is colloidal silicon dioxide?Colloidal silica is a gaseous silica prepared by hydrolysis of silica compounds. (it-chuiko.com)
  • What is Colloidal Silicon Dioxide? (it-chuiko.com)
Titanium2
  • Titanium dioxide (TiO2) is the major white pigment used by the paint industry. (chalmers.se)
  • Physical blockers such as titanium dioxide and zinc oxide are well tolerated. (medscape.com)
Made from silicon dioxide1
  • CimeXa is an amorphous silica gel desiccant dust (ASG dust)-a fine powder made from silicon dioxide, an extremely common natural compound. (cockroachfacts.com)
Effects of silicon dioxide2
  • Ge-Ge Traverse Optical (TO) peak was monitored using Raman spectroscopy to investigate germanium nanocrystal formation and stress effects of silicon dioxide. (metu.edu.tr)
  • I am not suggesting that people stop taking their medication without discussing it with their doctor - just that they be aware of the possible effects of silicon dioxide. (wordpress.com)
Citric Acid1
  • In the study group (HSIL, HPV positive), patients will be treated with intravaginal self-administrated vaginal gel Deflagyn containing 10.0 mg of highly dispersed silicon dioxide, 24.8 mg of citric acid, and 0.25 mg of selenium per administration (5 ml). (who.int)
Ingredients1
  • In the morning, convinced that the milk thistle had something to do with the severity of pain that night, I Googled the ingredients of the milk thistle one at a time and discovered what seemed to be a connection between silicon dioxide and my Fibromyalgia-like symptoms. (wordpress.com)
Quartz7
  • Classification and Preparation Process of Micron Powder Micron Silicon powder is a kind of non-toxic, tasteless and pollution-free silica powder which is made of crystalline quartz and fused s. (xzsnfusedquartz.com)
  • Due to changes in consumer demand, import and export conditions, and various investigations on the development of silicon dioxide quartz , the cost of silicon dioxide quartz is constantly changing. (manysmileys.com)
  • Taking into account the current market macroeconomic parameters, value chain analysis, channel partners, demand and supply, the cost of silicon dioxide quartz will also be affected to a certain extent. (manysmileys.com)
  • It is estimated that the cost of silicon dioxide quartz will increase slightly from today to next week. (manysmileys.com)
  • However, TRUNNANO provides high purity Nano silicon dioxide quartz with a steady price. (manysmileys.com)
  • In order to feedback to old customers, the company is still in full operations to provide silicon dioxide quartz with competitive price, " said Olina, sales manager of TRUNNANO. (manysmileys.com)
  • As a leading nanotechnology development and silicon dioxide quartz manufacturer, Luoyang Tongrun dominates the market. (manysmileys.com)
Powder1
Crystalline1
  • This substance is a generic term for silica dioxide including crystalline and amorphous. (go.jp)
Capsules1
  • Silicon dioxide can be found in Tylenol Cold capsules, antacids, some, but not all aspirins, Motrin and Ibuprofen. (wordpress.com)
Wafer surface1
  • A low temperature (-70oC) operation of an atomic force microscope (AFM) was used to condense ambient humidity (40%) to perform a thin frozen water layer covering a silicon wafer surface. (iium.edu.my)
Carbon3
  • In this environment, the VOCs are converted to harmless inert byproducts like carbon dioxide (CO 2 ), water vapor (H 2 O), and usable heat. (adhesivesmag.com)
  • Cosmetic improvement of rhinophyma may be produced by mechanical dermabrasion, carbon dioxide laser peel, and surgical shave techniques. (medscape.com)
  • and placement of an arterial line for measurement of mean arterial pressure, oxygen, and carbon dioxide content. (medscape.com)
Nanoparticles1
  • Current work describes experimental determination Young modulus of polymer composition based on epoxy resin filled two types of silicon dioxide nanoparticles with different average diameter. (epj.org)
Particle Size1
  • 1,Excellent coating performance: The particle size of silicon dioxide distribution uniformity and better dispersion, it can avoid fish eye, pit of the coating surface, the flatness, smooth performance of dry film will be better. (paintmattingagent.com)
Particles5
  • Due to high chemical affinity of ceria particles to silicon dioxide surfaces, STI CMP leads to particle contamination making post-CMP cleaning challenging as ceria particles adhere very strongly to STI wafers during polishing. (parksystems.com)
  • In our research, we are developing cleaning chemistries than can remove ceria particles from silicon dioxide wafers. (parksystems.com)
  • The particles on silicon dioxide wafer surfaces before and after cleaning are imaged using atomic force microscopy (AFM) and counted. (parksystems.com)
  • Topographic images of adsorbed ceria particles on silicon dioxide wafer surfaces in scan areas of 1 × 1 μm2 (for ~10 nm ceria particles), 2 × 2 μm2 (for ~30 nm ceria particles) and 10 × 10 μm2 (for ~90 nm ceria particles). (parksystems.com)
  • AFM images of adsorbed ceria particles on silicon dioxide wafer surfaces and the corresponding number of particles before and after cleaning with standard clean 1 (SC1) solution in scan areas of 1 × 1 μm2 (10 nm-ceria), 2 × 2 μm2 (30 nm-ceria), and 10 × 10 μm2 (90 nm-ceria). (parksystems.com)
Electron1
  • In this paper, we discuss the use of 10-undecanoic acid monolayers on silicon dioxide films in a novel electron beam patterning process. (elsevier.com)
Insoluble in water1
  • The Separation of a Mixture into Pure Substances , Silicon dioxide sand is a large macromolecule that is essentially insoluble in water , screen, which is resting on a iron ring Start to heat the solution gently with a burner so that the liquid does not boil over. (empresadesatascosmadrid.es)
Substances1
  • Silicon dioxide was one of the main problematic substances contained in the breast implants that leaked causing Fibromyalgia like symptoms. (wordpress.com)
High Purity1
  • Ultra high purity silicon can be doped with boron , gallium , phosphorus, or arsenic to produce silicon for use in transistors, solar cells , rectifiers, and other solid-state devices which are used extensively in the electronics industry .The name Silicon originates from the Latin word silex which means flint or hard stone. (americanelements.com)
Compounds1
  • c-Silica compounds have structures with repeating patterns of silicon and oxygen. (cdc.gov)
Sodium1
  • I just need to know how you d separate sodium bicarbonate I know HCl is somehow involved Question Suppose you were given a similar mixture containing five components silicon dioxide, iron filings, calcium carbonate, sodium chloride and sodium bicarbonate. (empresadesatascosmadrid.es)
Iron-silicon1
  • The metalloid is rarely found in pure crystal form and is usually produced from the iron-silicon alloy ferrosilicon. (americanelements.com)
Inorganic1
  • When heated above certain temperatures, silicone forms silicon dioxide (SiO 2 ), an inorganic particulate that clings to hot metallic surfaces and forms a destructive and efficiency-robbing barrier layer. (adhesivesmag.com)
Calcium1
  • 5A molecular sieve refers to calcium A type silicon aluminate. (it-chuiko.com)
Waveguides2
  • We report ultrabroadband measurements on waveguides of photoluminescent silicon-rich silicon dioxide produced by plasma enhanced chemical vapor deposition. (soton.ac.uk)
  • Nanophotonic wire silicon waveguides are indispensable components of integrated photonic circuits. (metu.edu.tr)
Anti-cakin1
  • Silicon Dioxide is an anti-caking agent that may account for up to 3% of a vitamin formula. (wordpress.com)
Earth's crust2
  • Silicon dioxide is the most abundant mineral in the earth's crust. (it-chuiko.com)
  • Silicon makes up 25.7% of the earth's crust, by weight, and is the second most abundant element, exceeded only by oxygen. (americanelements.com)
Characteristics1
  • Luminescence characteristics of silicon nanocrystals in visible and near infrared region (550nm-1050nm) with changing nanocrystal size and density were studied with photoluminescence spectroscopy. (metu.edu.tr)
Mechanical1
  • Silica (or silicon dioxide ), as sand, is a principal ingredient of glass, one of the most inexpensive of materials with excellent mechanical, optical, thermal, and electrical properties. (americanelements.com)
Cope1
  • I suspect the initial problem may result from heavy doses of medication that contain silicon dioxide, taken to cope with the illness or injury, followed by pain medication (also containing, silicon dioxide) taken to cope with the painful effects of the previously ingested silicon dioxide so that it becomes a vicious circle. (wordpress.com)
Surface3
  • Silicon dioxide Inkjet printing is absorbing material of colorful ink-jet base material surface coating, which is the coating's undertaking things. (paintmattingagent.com)
  • We have tested the ability of normal human osteoblasts to propagate and differentiate on silicon dioxide nanosprings, which can be easily grown on practically any surface. (biomedcentral.com)
  • A scanning probe was contacted with the layer and a zero bias voltage was applied to the sample surface with the AFM probe tip connected to the reference -2.44V. The frozen water film acted both as an electrolyte to form silicon dioxide and as a resource of hydroxide. (iium.edu.my)
Spray1
  • Then I will maintain the sealant with a Silicon dioxide spray. (fracasw42.com)
Atomic1
  • Silicon (atomic symbol: Si, atomic number: 14) is a Block P, Group 14, Period 3 element with an atomic weight of 28.085. (americanelements.com)
Mineral1
  • Silica, also known as silicon dioxide, is the most common mineral on earth. (cdc.gov)
Oxygen1
  • All forms of silica are odorless solids composed of silicon and oxygen atoms. (cdc.gov)
DailyMed - OXYCODONE HYDROCHLORIDE tablet
DailyMed - OXYCODONE HYDROCHLORIDE tablet (dailymed.nlm.nih.gov)
Tle6 (TLE family member 6, subcortical maternal complex member) - Rat Genome Database
Tle6 (TLE family member 6, subcortical maternal complex member) - Rat Genome Database (rgd.mcw.edu)
Copy this link to clipboard
Copy this link to clipboard (spectrum.ieee.org)
Alphabetical Method Listing - S - NMAM 4th Edition | NIOSH | CDC
Alphabetical Method Listing - S - NMAM 4th Edition | NIOSH | CDC (cdc.gov)
RTECS:VV7310000 - Silica, amorphous fumed - The Registry of Toxic Effects of Chemical Substances | CDC/NIOSH
RTECS:VV7310000 - Silica, amorphous fumed - The Registry of Toxic Effects of Chemical Substances | CDC/NIOSH (cdc.gov)
Photonics | Free Full-Text | External Control of Dissipative Coupling in a Heterogeneously Integrated Photonic Crystal-SOI...
Photonics | Free Full-Text | External Control of Dissipative Coupling in a Heterogeneously Integrated Photonic Crystal-SOI... (mdpi.com)
Browsing by Subject Silicon Dioxide
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Hydrocodone and Acetaminophen Capsules: Package Insert / Prescribing Information - Drugs.com
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Didanosine: Package Insert / Prescribing Information - Drugs.com
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Here Comes The Sun-powered Economy - GOOD
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Silicosis | Definition and Patient Education
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These highlights do not include all the information needed to use MIRTAZAPINE TABLETS safely and effectively. See full...
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IJMS | Free Full-Text | Anti-Atherosclerotic Effects of a Phytoestrogen-Rich Herbal Preparation in Postmenopausal Women
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Electron-beam-assisted superplastic shaping of nanoscale amorphous silica | Nature Communications
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These highlights do not include all the information needed to use TIZANIDINE TABLETS safely and effectively. See full...
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These highlights do not include all the information needed to use SPIRONOLACTONE TABLETS safely and effectively. ...
These highlights do not include all the information needed to use SPIRONOLACTONE TABLETS safely and effectively. ... (dailymed.nlm.nih.gov)