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 ...
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 ...
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 ...
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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...
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
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 ...
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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
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.
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
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 ...
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 ...
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,
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.
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 ...
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 ...
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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 ...
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 ...
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...
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.
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, ...
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 ...
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 ...
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 ...
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 ...
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 ...
Use DiagNano™ PEG-Amine Silica-Coated Gold Nanoparticles, 1000 nm, Silica Shell 30 nm for fast, easy, and consistent DNA/RNA Purification, Antibody/Protein Purification, Cell Isolation.
Crystalline silica may act as an immune adjuvant to increase inflammation and antibody production, and findings of occupational cohort studies suggest that silica exposure may be a risk factor for systemic lupus erythematosus (SLE). We undertook this population-based study to examine the association between occupational silica exposure and SLE in the southeastern US. SLE patients (n = 265; diagnos
Comparing Heat-treated Silica Particle with Silica Particles for the Ability to Induce Superoxide Release from Rat Alveolar Macrophages Abstract.
TY - JOUR. T1 - Development of an affinity silica monolith containing α1-acid glycoprotein for chiral separations. AU - Mallik, Rangan. AU - Xuan, Hai. AU - Hage, David S.. PY - 2007/5/18. Y1 - 2007/5/18. N2 - An affinity monolith based on silica and containing immobilized α1-acid glycoprotein (AGP) was developed and evaluated in terms of its binding, efficiency and selectivity in chiral separations. The results were compared with data obtained for the same protein when used as a chiral stationary phase with HPLC-grade silica particles or monoliths based on a copolymer of glycidyl methacrylate (GMA) and ethylene dimethacrylate (EDMA). The surface coverage of AGP in the silica monolith was 18% higher than that obtained with silica particles and 61% higher than that measured for a GMA/EDMA monolith. The higher surface area of the silica monolith gave materials that contained 1.5- to 3.6-times more immobilized protein per unit volume when compared to silica particles or a GMA/EDMA monolith. The ...
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 nanosilica 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 nanosilica 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 are 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.. ...
HIGHLIGHT Nature: A Warburgh shakeup, Nature Chemical Biology: Nat Chem Biol. 2011 Dec 15;8(1):20.. Mamaeva, V., Rosenholm, J.M., Tabe Bate-Eya, L., Bergman, L., Peuhu,E., Duchanoy, A., Fortelius, L.E., Landor, S., Toivola, D.M Lindén, M., and Sahlgren, C. Mesoporous silica nanoparticles as drug delivery systems for targeted inhibition of Notch signaling in cancer. Molecular Therapy 19:1538-46, 2011. Jessica M. Rosenholm, Cecilia Sahlgren#, Mika Linden#. Multifunctional mesoporous silica nanoparticles for combined therapeutic, diagnostic and targeted action in cancer treatment Current Drug Targets 12:1166-86, 2011. Pallari, H.M., Lindqvist, J., Torvaldson, E., Ferraris, S.E., He, T., Sahlgren, C., and Eriksson, J.E. Nestin as a regulator of Cdk5 in differentiating myoblasts. Molecular Biology of the Cell. 22, 1539-49, 2011. Jessica M. Rosenholm, Cecilia Sahlgren#, Mika Linden#. Towards intelligent, targeted drug delivery systems using mesoporous silicananoparticles - Opportunities & Challenges ...
Supply monodisperse silica SiO2 microspheres with uniform particle size:porous monodisperse silicon dioxide microspheres,nonporous monodisperse silica microspheres...
Catalytically active amorphous silicas are prepared by dehydrating a silica hydrogel or precipitate prepared from an acidified aqueous silicate solution containing an amine of pKa above 10 or a cation containing either a nitrogen or phosphorus atom bonded to four carbon atoms. The resultant amorphous silica is catalytically active for, among other chemical reactions, the isomerization of ortho-xylene and the cracking of hydrocarbons.
D. A. Guilhot, G. D. Emmerson, C. B. E. Gawith, S. P. Watts, D. P. Shepherd, R. B. Williams, and P. G. R. Smith, "Single-mode direct-ultraviolet-written channel waveguide laser in neodymium-doped silica on silicon," Opt. Lett. 29, 947-949 (2004 ...
The chemical formula for silicon dioxide, also called silica, is SiO2. Silicon and oxygen are two of the most abundant elements in the Earths crust, with silica composing 59 percent. When exposed to...
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Beside IGCC, efficient storage and transportation of CO2 and other gases require pressurize conditions. CO2 and other gases adsorption on solid sorbents at high pressure and various temperatures are extremely important as long as the environmental purification via gas capture and separation and gas transpiration are concern. The main objective of the present research was to investigate the effect of amine impregnation on the CO2, methane and nitrogen adsorption capacity of mesoporous silica (SBA-15). Ordered mesoporous silica (SBA-15) was prepared and modified with ammonium hydroxide solution to introduce NH2 functional groups within the pores of materials to produce modified SBA-15 (MSBA-15). The newly prepared materials were characterized with X-ray diffraction analysis, thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) analysis were performed to measure pore volume as well as the surface area ...
A sensitive electrochemical approach for the detection of thrombin was designed by using densely packed hierarchical dendritic gold microstructures (HDGMs) with secondary and tertiary branches as matrices, and thionine-functionalized mesoporous silica nanospheres as signal tags. To prepare the signal tags, the positively charged thionine (as an indicator) was initially adsorbed onto the mesoporous silica nanoparticles (MSNs). Then [AuCl(4)](-) ions were in situ reduced on the thionine-modified MSNs by ascorbic acid to construct nanogold-decorated MSNs (GMSNs). The formed GMSNs were employed as label of the aminated aptamers. The assay was carried out in PBS, pH 7.4 with a sandwich-type assay mode by using the assembled thionine in the GMSNs as indicators. Compared with the pure silica nanoparticles, mesoporous silica could provide a larger surface for the immobilization of biomolecules and improve the sensitivity of the aptasensor. Under optimal conditions, the electrochemical aptasensors exhibited a
The properties of sets of atoms effectively control the modern world. For example, the atoms you see above form a small piece of silicon dioxide or SiO2. This model contains around 180 atoms and at its longest dimension is approximately 1.5 nanometers, or 1.5x10-9m, long.. Although this is a very small number of atoms, and a very small distance from one end of the group to the other, this size range is important to todays electronic devices. 1.5 nanometers marks the practical minimum limit to the thickness of SiO2 that can be used as an insulator in a component on an electronic chip. If you make the layer of SiO2 any smaller than this, too much current will flow through the supposedly insulating layer, and the device will overheat. So, SiO2 based insulators have a practical limit to their minimum dimensions.. The minimum dimensions of components on a chip determine the number of components on the chip. The more component that can be squeezed onto a chip, the more powerful the CPU, and the more ...
Internalization and fate of silica nanoparticles in C2C12 skeletal muscle cells: evidence of a beneficial effect on myoblast fusion Sylvie Poussard,1,2 Marion Decossas,1,2 Olivier Le Bihan,1,2 Stéphane Mornet,3 Grégoire Naudin,1,2 Olivier Lambert1,2 1Institute of Chemistry and Biology of Membranes and Nanoobjects, University of Bordeaux, UMR5248, Pessac, France; 2Institute of Chemistry and Biology of Membranes and Nanoobjects, Centre National de la Recherche Scientifique, Institute of Chemistry and Biology of Membranes and Nanoobjects, UMR5248, Pessac, France; 3ICMCB, Institut de Chimie de la Matière Condensée de Bordeaux, CNRS UPR9048, Université de Bordeaux, Pessac, France Abstract: The use of silica nanoparticles for their cellular uptake capability opens up new fields in biomedical research. Among the toxicological effects associated with their internalization, silica nanoparticles induce apoptosis that has been recently reported as a biochemical cue
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Inorganic-organic nanostructured hybrid membranes based on polyethersulfone (PES)-polyvinylpyrrolidone (PVP) were prepared with mesoporous silica materials. All the hybrid membranes showed the similar phosphoric acid (PA) uptake. However, the proton conductivity of the PA-PES-PVP membrane was significantly increased after the addition of the inorganic fillers, especially for the amino-functionalized hollow mesoporous silica (NH2-HMS). The cell performance test also confirmed the superiority of the PES-PVP membranes with the inorganic fillers. The highest peak power density at 180 oC reached up to 480 mW cm-2 for the NH2-HMS based composite membrane fuel cell, which is 92.7 % higher than that of the PA-PES-PVP membrane fuel cell at the identical condition. The outstanding performance of the inorganic-organic hybrid membranes might be due to the facilitated proton transportation in the ordered mesoporous channels, and the great water retention of the inorganic fillers ...
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This report is a comprehensive research of silicon dioxide market in Argentina. The report starts with giving brief country profile for Argentina, including
This market research report examines the foreign trade of Poland and its perspectives on the global market for silicon dioxide. The report will
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