Silicon
Carbon Compounds, Inorganic
Silicon Dioxide
Nanowires
Semiconductors
Nanotechnology
Porosity
Transistors, Electronic
Germanium
Silicic Acid
Electronics
Silanes
Surface Properties
Biosensing Techniques
Nanostructures
Molecular Structure
Micro-Electrical-Mechanical Systems
Microtechnology
Manufacturing technology for making microscopic devices in the micrometer range (typically 1-100 micrometers), such as integrated circuits or MEMS. The process usually involves replication and parallel fabrication of hundreds or millions of identical structures using various thin film deposition techniques and carried out in environmentally-controlled clean rooms.
Silicones
Microscopy, Electron, Scanning
Microscopy in which the object is examined directly by an electron beam scanning the specimen point-by-point. The image is constructed by detecting the products of specimen interactions that are projected above the plane of the sample, such as backscattered electrons. Although SCANNING TRANSMISSION ELECTRON MICROSCOPY also scans the specimen point by point with the electron beam, the image is constructed by detecting the electrons, or their interaction products that are transmitted through the sample plane, so that is a form of TRANSMISSION ELECTRON MICROSCOPY.
Sulfur Compounds
Hafnium
Diatoms
Volatile Organic Compounds
Equipment Failure Analysis
Nanopores
Lab-On-A-Chip Devices
Microdevices that combine microfluidics technology with electrical and/or mechanical functions for analyzing very small fluid volumes. They consist of microchannels etched into substrates made of silicon, glass, or polymer using processes similar to photolithography. The test fluids in the channels can then interact with different elements such as electrodes, photodetectors, chemical sensors, pumps, and valves.
Optical Devices
Comb and Wattles
Lewis Bases
Solvents
Stereoisomerism
Rubber
A high-molecular-weight polymeric elastomer derived from the milk juice (LATEX) of HEVEA brasiliensis and other trees and plants. It is a substance that can be stretched at room temperature to at least twice its original length and after releasing the stress, retract rapidly, and recover its original dimensions fully.
Silicone Elastomers
Polymers of silicone that are formed by crosslinking and treatment with amorphous silica to increase strength. They have properties similar to vulcanized natural rubber, in that they stretch under tension, retract rapidly, and fully recover to their original dimensions upon release. They are used in the encapsulation of surgical membranes and implants.
Silicone Oils
Legislation, Pharmacy
Palladium
Alkenes
Polyvinyl Alcohol
Gas, Natural
A combustible, gaseous mixture of low-molecular weight PARAFFIN hydrocarbons, generated below the surface of the earth. It contains mostly METHANE and ETHANE with small amounts of PROPANE; BUTANES; and higher hydrocarbons, and sometimes NITROGEN; CARBON DIOXIDE; HYDROGEN SULFIDE; and HELIUM. (from McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
Polymers
Tissue Conditioning (Dental)
Thermoanaerobacter
Influence of fibre length, dissolution and biopersistence on the production of mesothelioma in the rat peritoneal cavity. (1/180)
A range of respirable man-made mineral fibres were tested for evidence of carcinogenicity by injection into the peritoneal cavity of male SPF Wistar rats; and differences in carcinogenicity were related to the dimensions and biopersistence of the injected fibres. The fibres tested included an amosite asbestos, a silicon carbide whisker, a special purpose glass microfibre, and a range of other man-made vitreous fibres (MMVFs) and refractory ceramic fibres (RCFs) from the TIMA fibre repository. The injected dose of each was designed as the estimated mass required to contain 10(9) fibres > 5 microns in length, as determined by optical microscopy. The numbers of long fibres (> 15 microns) contained in these doses ranged across fibres from 0.1 x 10(9) to 0.8 x 10(9) fibres; the number of long fibres thinner than 0.95 micron ranged from 0.015 x 10(9) to 0.4 x 10(9). The treatment groups contained between 18 and 24 animals. Animals were killed when they showed signs of debilitation. At autopsy, the diagnosis of mesothelioma was usually obvious macroscopically. Otherwise, histological examination of peritoneal organs was used to search for early tumour development. Judged by median survival time, four of the fibre types, in the doses administered, presented higher mesothelioma activity than amosite asbestos. The other fibres tested were less carcinogenic than the amosite. Only a ceramic material derived by extreme heating to simulate the effect of furnace or oven conditions, produced no mesotheliomas. Attempts were made, using regression models, to relate these differences to fibre dimensions and to measures of durability from separate experiments. The results pointed principally to a link with the injected numbers of fibres > 20 microns in length and with biopersistence in the rat lung of fibres longer than 5 microns. Improved quantification of the relative importance of fibre dimensions and biopersistence indices requires experimentation with a range of doses. (+info)Depletion of glutathione and ascorbate in lung lining fluid by respirable fibres. (2/180)
OBJECTIVE: The use of synthetic vitreous fibres has increased along with a decline in the utilisation of asbestos. There remains concern that these synthetic fibres pose a health risk to workers because of the generation of respirable fibres which can enter the lung and cause adverse health effects. An improved understanding of the mechanism of fibre pathogenicity should allow more rational short-term testing regimes for new fibres as they are developed. We hypothesised that carcinogenic fibres have greater free radical activity compared with non-carcinogenic fibres and that they contribute to disease by causing oxidative stress in the lung. We examined a panel of respirable fibres, designated as being carcinogenic or non-carcinogenic based on previous animal studies for ability to deplete antioxidants from lung lining fluid. METHODS: On the basis of inhalation studies, a panel of fibres was divided into three carcinogenic fibres-amosite asbestos, silicon carbide, and refractory ceramic fibre 1 (RCF1) and three non-carcinogenic fibres-man-made vitreous fibre 10 (a glass fibre MMVF10), Code 100/475 glass fibre, and refractory ceramic fibre 4 (RCF4). We measured the levels of glutathione (GSH) and ascorbate, two antioxidants present in lung lining fluid (LLF) after fibre treatment. All of the experiments were carried out at equal fibre number. RESULTS: Fibres had the ability to deplete both GSH and ascorbate from both LLF and pure solutions, an effect which was fibre number dependent. The greatest depletion of antioxidants was observed with the two non-carcinogenic glass fibres, and this effect was observed when A549 lung epithelial cells were treated with fibres. CONCLUSIONS: Our results show that antioxidant depletion in cell free solution and lung lining fluid solely is not a simple indicator of the ability of fibres to cause lung pathology and that other biological events in the lung are involved. (+info)Magnetometric evaluation for the effects of silicon carbide whiskers on alveolar macrophages. (3/180)
Alveolar macrophages are thought to play an important role in fibrogenesis in the lungs caused by various types of exposure to dust. In this experiment, we evaluated the effect of silicon carbide whiskers (SiC) on alveolar macrophages mainly by unique magnetometry and also by established methods such as lactate dehydrogenase (LDH) activity, apoptosis measurement and morphological observations. Alveolar macrophages obtained from Syrian golden hamsters by bronchoalveolar lavages were exposed in vitro to Fe3O4 for 18 hours as an indicator for magnetometry and SiC for experiments. A rapid decrease of the remanent magnetic field, so called "relaxation", was observed after cessation of an external magnetic field in macrophages phagocytizing Fe3O4 alone, while relaxation was delayed in those concurrently exposed to SiC. Release of LDH from SiC-exposed macrophages into the medium was not significantly higher than the controls, but it increased dose-dependently. Apoptosis was recognized in macrophages exposed to 60 micrograms/ml of SiC by the DNA ladder detection method and morphological observations. Electron microscopic examination revealed irregular forms of nuclei and organellas in macrophages exposed to SiC. Magnetometry, LDH release and electron microscopic observation indicated mild cytotoxicity of SiC to alveolar macrophages. (+info)Origin of nanomechanical cantilever motion generated from biomolecular interactions. (4/180)
Generation of nanomechanical cantilever motion from biomolecular interactions can have wide applications, ranging from high-throughput biomolecular detection to bioactuation. Although it has been suggested that such motion is caused by changes in surface stress of a cantilever beam, the origin of the surface-stress change has so far not been elucidated. By using DNA hybridization experiments, we show that the origin of motion lies in the interplay between changes in configurational entropy and intermolecular energetics induced by specific biomolecular interactions. By controlling entropy change during DNA hybridization, the direction of cantilever motion can be manipulated. These thermodynamic principles were also used to explain the origin of motion generated from protein-ligand binding. (+info)Neutron reflection from a dimyristoylphosphatidylcholine monolayer adsorbed on a hydrophobised silicon support. (5/180)
Neutron specular reflection has been used to study the structure of a monolayer of dimyristoylphosphatidylcholine (DMPC) deposited using the Langmuir-Blodgett technique onto a silicon oxide substrate. A self-assembled monolayer of octadecyltrichlorosilane with a deuterated alkyl chain (d-OTS) had been previously bonded onto this silicon oxide substrate which rendered it hydrophobic. In the system under study, the alkyl chains of the phospholipid were found to penetrate extensively into the d-OTS layer with the mixed chain region (d-OTS and DMPC) having a total thickness of 30.5 A. This mixed region was divided into two halves for analysis; the 'lower half' (nearest to the substrate surface) was found to comprise anchored d-OTS chains mixed with the lipid chains in the volume ratio approx. 0.60:0.35. The corresponding volume ratio in the 'upper half' of this region was determined to be approx. 0.50:0.40. The thicknesses of these regions were found to be 17.9 A (incorporating approx. 6% solvent) and 12.6 A (incorporating approx. 9% solvent) for the lower and upper halves respectively. The DMPC head groups were found to be confined to the most external layer (furthest away from the silicon substrate). This layer was found to have a thickness of 9.4 A and included a small fraction of the lipid alkyl chains with approx. 47% solvent. (+info)Short term effect of silicon carbide whisker to the rat lung. (6/180)
We studied the short-term effect of silicon carbide whisker (SiCW) in vivo by instillation and inhalation to the rat lung. SiCW was instilled low dose (2 mg/0.5 ml saline) or high dose (10 mg/ 0.5 ml) intratracheally into the lungs of 25 rats. SiCW was also inhaled to another 25 rats at the average concentration of 10.4 mg/m3 for 1 month. In instillation study, the lung had focal alveolitis with the destruction of alveolar wall especially at 3 days after the instillation, and the lesion remained as an aggregated foci of SiCW at 6 months. The 'inflammation-score' of the instilled group by point counting method of the specimen correspondingly decreased gradually. In inhalation group, a minimum inflammatory change was observed. Collagen deposition in the aggregated foci of SiCW with accumulated alveolar macrophages and neutrophils was not progressive during the observed period. These findings suggest that SiCW may cause a minor effect to the rat lung in 6 months after exposure. (+info)Cancer incidence among workers in the Norwegian silicon carbide industry. (7/180)
The presence of silicon carbide (SiC) fibers in the SiC smelter work environment has suggested a possible cancer hazard. The authors studied cancer incidence among 2,620 men employed for more than 6 months in three Norwegian SiC smelters. Follow-up from 1953 to 1996 revealed an overall excess risk of lung cancer (standardized incidence ratio = 1.9, 95% confidence interval (CI): 1.5, 2.3) and an elevated risk of stomach cancer (standardized incidence ratio = 1.5, 95% CI: 1.1, 2.0). Both standardized incidence ratio and Poisson regression analyses showed that lung cancer risk increased according to cumulative exposure to total dust, SiC fibers, SiC particles, and crystalline silica. The standardized incidence ratio for the upper SiC fiber exposure category was 3.5 (95% CI: 2.1, 5.6) when exposure was lagged by 20 years, while the Poisson regression analysis showed a rate ratio of 4.4 (95% CI: 2.1, 9.0). Smoking did not seem to be an important confounder. The excess risk of lung cancer may be explained by exposure to SiC fibers, but a strong correlation between the different exposures made it difficult to distinguish between them. (+info)Silicon-based biosensors for rapid detection of protein or nucleic acid targets. (8/180)
BACKGROUND: We developed a silicon-based biosensor that generates visual, qualitative results or quantitative results for the detection of protein or nucleic acid targets in a multiplex format. METHODS: Capture probes were immobilized either passively or covalently on the optically coated surface of the biosensor. Intermolecular interactions of the immobilized capture probe with specific target molecules were transduced into a molecular thin film. Thin films were generated by enzyme-catalyzed deposition in the vicinity of the surface-bound target. The increased thickness on the surface changed the apparent color of the biosensor by altering the interference pattern of reflected light. RESULTS: Cytokine detection was achieved in a 40-min multiplex assay. Detection limits were 4 ng/L for interleukin (IL)-6, 31 ng/L for IL1-beta, and 437 ng/L for interferon-gamma. In multianalyte experiments, cytokines were specifically detected with signal-to-noise ratios ranging from 15 to 80. With a modified optical surface, specificity was also demonstrated in a nucleic acid array with unambiguous discrimination of single-base changes in a 15-min assay. For homozygous wild-type and homozygous mutant samples, signal-to-noise ratios of approximately 100 were observed. Heterozygous samples yielded approximately equivalent signals for wild-type and mutant capture probes. CONCLUSIONS: The thin-film biosensor allows rapid, sensitive, and specific detection of protein or nucleic acid targets in an array format with results read visually or quantified with a charge-coupled device camera. This biosensor is suited for multianalyte detection in clinical diagnostic assays. (+info)
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SilicaSurrounding a ceAtomsChemistryPhosphorusSynthesisDioxideSemiconductorSulfurBondsPotting CompoundMethylOXIDESLapping CompoundHydrogenCarbonylOrganosilicon compoundReactionSilicateBORONReagentsCarbide Grease MixOlefinsCyclicChlorineSiClSilicone Rubber CompoundReactionsNitrogenFunctionalized surfacesOxideCloverSubstancesEncapsulantsPolymericSubstratesProductsSiloxanesElementalAbrasiveCentersTetrachlorideRubberChemical CompoundSolventsSilicatesEpoxyOrganometallicMaterialFerrosiliconThermalMolecularGreaseElectron
Silica23
- In one embodiment, the silicon compounds are attached to the surface of a substrate comprising silica, such as a glass substrate, to provide a functionalized surface on the substrate, to which molecules, including polypeptides and nucleic acids, may be attached. (google.co.uk)
- In one embodiment, after covalent attachment of a functionalized silicon compound to the surface of a solid silica substrate to form a functionalized coating on the substrate, an array of nucleic acids may be covalently attached to the substrate. (google.co.uk)
- Evonik Industries and Jiangsu Zhongneng Polysilicon Technology Development Co. Ltd., a wholly owned subsidiary of GCL-Poly Energy Holdings Limited, have signed a letter of intent to establish a joint venture for the production of fumed silica and ultra-pure silicon tetrachloride in China. (coatingsworld.com)
- Silicon tetrachloride is a byproduct of PCS production, and the joint venture will purchase this to produce AEROSIL fumed silica and Siridion STC HP ultra-pure silicon tetrachloride. (coatingsworld.com)
- By making the planned investment we are aiming to further strengthen our market position for fumed silica and ultra-pure silicon tetrachloride and to promote growth, particularly in the attractive Chinese market,' said Klaus Engel, CEO of Evonik Industries. (coatingsworld.com)
- This cooperation can combine Evonik's advanced technologies of producing silica and ultra-pure silicon tetrachloride with Jiangsu Zhongneng's leading technologies of silicon material production. (coatingsworld.com)
- However, despite its abundance, terrestrial life only uses silicon as silicic acid and silica (see Appendix A ). There are no known examples of life using any other type of silicon chemistry. (mdpi.com)
- It is used to produce high purity silicon and silica for commercial applications. (wikipedia.org)
- In rare occurrences, the silicon dioxide in silica is converted to silicon tetrachloride when the contaminated brine is electrolyzed . (wikipedia.org)
- Silicon tetrachloride can also be hydrolysed to fumed silica . (wikipedia.org)
- Silicon dioxide , also known as silica , silicic acid or silicic acid anydride is an oxide of silicon with the chemical formula Si O 2 , most commonly found in nature as quartz and in various living organisms. (wikipedia.org)
- Silica is one of the most complex and most abundant families of materials, existing as a compound of several minerals and as synthetic product. (wikipedia.org)
- Several science fiction stories feature silicon-based life-forms--sentient crystals, gruesome golden grains of sand and even a creature whose spoor or scat was bricks of silica left behind. (scientificamerican.com)
- silicon oxidizes to the solid silicon dioxide, called silica. (scientificamerican.com)
- Silica, or sand is a solid because silicon likes oxygen all too well, and the silicon dioxide forms a lattice in which one silicon atom is surrounded by four oxygen atoms. (scientificamerican.com)
- Several compounds such as silica, asbestos, silicone or, nanoparticles are built from tetrahedral units with silicon as the central atom. (hindawi.com)
- 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)
- The term "silica" denotes the compound silicon dioxide, SiO 2 . (encyclopedia.com)
- In this reaction, silica and a carbon source (generally wood) are heated together at extremely high temperatures to yield silicon in its elemental form. (encyclopedia.com)
- Silica is another name for the chemical compound composed of silicon and oxygen with the chemical formula SiO2, or silicon dioxide. (cdc.gov)
- Silica compounds can be divided into two groups, crystalline (or c-silica) and amorphous silica (a-silica or non-crystalline silica). (cdc.gov)
- c-Silica compounds have structures with repeating patterns of silicon and oxygen. (cdc.gov)
- All forms of silica are odorless solids composed of silicon and oxygen atoms. (cdc.gov)
Surrounding a ce1
- In the majority of silicates , the silicon atom shows tetrahedral coordination , with four oxygen atoms surrounding a central Si atom. (wikipedia.org)
Atoms11
- The researchers first grow a thin layer of the material using molecular beam epitaxy, a process widely used in the semiconductor industry in which evaporated atoms of indium, gallium and arsenic react with each other within a vacuum to form a single-crystal compound. (cellular-news.com)
- The scarcity of silicon-sulfur compounds in the reaction products is undoubtedly due to the instability of these compounds and to the affinity of SiF2 for atoms other than sulfur. (rice.edu)
- After 70 years of unsuccessful attempts, several stable disilene-compounds with double bonds between silicon atoms-have now been made. (sciencemag.org)
- A series of compounds containing up to six silicon atoms in the chain can be separated from the mixture using fractional distillation . (wikipedia.org)
- To prepare compounds which have three silicon atoms bonded to one nitrogen atom has been difiicult and known methods require harsh conditions. (google.com)
- Abstract We calculated the structural, elastic, and electronic properties of alkali metal Na atoms doped type-I silicon-clathrate compound (Na 8 Si 46 ) under pressure using first-principles methods. (iphy.ac.cn)
- The calculated total and partial electron densities of states of Na 8 Si 46 indicate a weak interaction between the encapsulated Na atoms and the silicon framework. (iphy.ac.cn)
- Each has a so-called valence of four--meaning that individual atoms make four bonds with other elements in forming chemical compounds. (scientificamerican.com)
- At present it is preferred to employ polysiloxanyl acrylate and methacrylate esters which have a straight or branched siloxane chain containing two to four silicon atoms having methyl or phenyl substituents and one to three ethylene groups connecting the. (google.ca)
- 6. Formation of ( h -Benzene) or ( h -Cyclohexa-1 ,3 -diene) Compounds of Chromium, Tungsten and Rhenium from Cyclohexane and the Metal atoms. (columbia.edu)
- In the case of dichlorodimethylsilane, two chlorine atoms are available, so that a reaction with excess water produces a linear chain of ether-like linkages between silicon atoms. (wikipedia.org)
Chemistry24
- The chemistry of organic silicon compounds S Patai (general ed) Updates on the SiliconЦHeteroatom Bond D A Armitage (ed) Wiley Chichester 1991 540 pages 90. (docme.ru)
- The observation by the author that there have been 300 references to silicon-nitrogen chemistry over the past three years in the RSC Specialist Reports on Organometallic Chemistry shows that there was a definite need for these chapters, if a relatively comprehensive coverage of modern organosilicon chemistry were to be achieved within the series. (docme.ru)
- In addition to the two chapters on the reactions of silicon-nitrogen compounds, the 'Update' volume contains five other chapters on silicon-heteroatom chemistry, previously published in the main volume. (docme.ru)
- The very long lists of references in these appendices is an indication of the enormous and growing general interest in silicon chemistry. (docme.ru)
- The 'Update' volume together with the two main volumes are of value not only to the silicon specialist but to all organic and organometallic chemists and an essential purchase for all academic libraries with a chemistry collection. (docme.ru)
- A W P JARVIE Aston University, UK Chemistry and Technology of Silicon and Tin Proceedings of the First Asian Network for Analytical and Inorganic Chemistry International Conference on Silicon and Tin V G Kumar Das, S W Ng and M Gielen (eds) Oxford University Press, Oxford, 1992 611 pages. (docme.ru)
- f80.00 ISBN 0 19 855580 6 In October 1989, the 1st International Chemical Conference on Silicon and Tin, which was organized by the Asian Network for Analyticd and Inorganic Chemistry (ANAIC), was held at the Institute of Advanced Studies, University of Malaya in Kuala Lumpur. (docme.ru)
- The silicon-silicon double bond resembles in many ways the well-known carbon-carbon double bond of organic chemistry. (sciencemag.org)
- Despite more than one hundred years of work on organosilicon chemistry, the basis for the plausibility of silicon-based life has never been systematically addressed nor objectively reviewed. (mdpi.com)
- We assess whether or not silicon chemistry meets the requirements for chemical diversity and reactivity as compared to carbon. (mdpi.com)
- In no environment is a life based primarily around silicon chemistry a plausible option. (mdpi.com)
- When people speak of "silicon-based life", they are usually referring to the diverse organosilicon chemistry, and specifically chemistry in which carbon in organic molecules is replaced by silicon. (mdpi.com)
- So why is life's use of silicon so restricted, and could a wider silicon chemistry be used in other biochemistries? (mdpi.com)
- Cluster compounds, a new aspect of inorganic chemistry. (google.com)
- His scientific expertise spans from semiconductor physics and chemistry to surface defect science and silicon processes for photovoltaic uses. (wiley.com)
- Silicon can grow into a number of lifelike structures, but its chemistry makes it unlikely that it could be the basis for alien life-forms. (scientificamerican.com)
- and silicon chemistry is not stable in aqueous, or watery, environments. (bigthink.com)
- Under certain conditions, silicon-based chemistry might be more favorable for life than carbon-based. (bigthink.com)
- Silicon chemistry would also be much more amenable to life in oceans of cold elements that we don't usually associate with life , such as liquid nitrogen, methane, ethane, neon, and argon. (bigthink.com)
- It's also capable of dissolving organic compounds like water, and, unlike water, it can also dissolve some metallic ones, opening up the possibility for some more interesting chemistry to be used in living things. (bigthink.com)
- However, little of the chemistry of silicon can be inferred from carbon, one of its closest neighbors. (encyclopedia.com)
- French chemist Charles Friedel and U.S. chemist James Mason Crafts are credited for not only making the first compound that contained a silicon-carbon bond, but also determining the molecular weight of silicon during their years of research in this area of chemistry. (encyclopedia.com)
- However, his strategy to name silicon-containing materials based on a nomenclature system derived from organic chemistry was lost when the silicon analog to a ketone could not be isolated. (encyclopedia.com)
- Rochow, E. "An Introduction to the Chemistry of the Silicones. (wikipedia.org)
Phosphorus4
- Compounds containing phosphorus. (elsevier.com)
- x", "y" and "z" represent the mole fractions of silicon, aluminum and phosphorus respectively, present as tetrahedral units, said mole fractions being such that they are within the pentagonal compositional area defined by points A, B, C, D and E of the ternary diagram which is FIG. 1. (google.es)
- 2. The process of claim 1 wherein the silicoaluminophosphate has mole fractions of silicon, aluminum and phosphorus within the pentagonal compositional area defined by points a, b, c, d and e of the ternary diagram which is FIG. 2. (google.es)
- 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)
Synthesis6
- The new compounds are potential Cp-transfer reagents for the synthesis of other cyclopentadienyl complexes. (uni-bielefeld.de)
- On the skin, it is suggested that silicon is important for optimal collagen synthesis and activation of hydroxylating enzymes, improving skin strength and elasticity. (scielo.br)
- It is the ribonucleotide of hypoxanthine and is the first compound formed during the synthesis of purine in organisms. (britannica.com)
- American Elements customers use high purity silicon dioxide in the production optical glasses, LED and fiber optics, solar panels, semiconductor diffusion barriers and fillers, thermal spray coatings, and the synthesis of ultra high purity silicon metal via Czochralski crystal growth or evaporation. (americanelements.com)
- Methyltrichlorosilane results from the direct process of chloromethane with elemental silicon in the presence of a copper catalyst, usually at a temperature of at least 250 °C. 2 CH3Cl + Si → (CH3)4−nSiCln + other products While this reaction is the standard in industrial silicone production and is nearly identical to the first direct synthesis of methyltrichlorosilane, the overall process is inefficient with respect to methyltrichlorosilane. (wikipedia.org)
- doi:10.1002/14356007.a24_021 Rochow, E. The Direct Synthesis of Organosilicon Compounds. (wikipedia.org)
Dioxide5
- Silicon tetrachloride is prepared by the chlorination of various silicon compounds such as ferrosilicon , silicon carbide , or mixtures of silicon dioxide and carbon. (wikipedia.org)
- Uptake of amorphous silicon dioxide, in high doses, leads to non-permanent short-term inflammation, where all effects heal. (wikipedia.org)
- American Elements manufactures high purity (5N, 99.999%) silicon dioxide powder (also referred to as High grade quartz or HPG) in solar, electronics, optical, and semiconductor grades suitable for exacting requirements of emerging technologies. (americanelements.com)
- Minimizing impurities in American Elements silicon dioxide powder make it suitable for use as a reference standard for XRD and impurity testing. (americanelements.com)
- Chlorosilanes react with water to produce hydrogen chloride, giving siloxanes and eventually silicon dioxide. (wikipedia.org)
Semiconductor8
- Although many of the techniques applied by the team are already used in silicon fabrication, they have only rarely been used to make compound semiconductor transistors. (cellular-news.com)
- But when you are talking about integrating billions of tiny transistors onto a chip, then we need to completely reformulate the fabrication technology of compound semiconductor transistors to look much more like that of silicon transistors,' del Alamo says. (cellular-news.com)
- While low purity, cheap silicon carbide powder is widely used in as abrasive and cutting tool components, products with high purity could be applied in areas such as semiconductor industries. (geebeefoto.nl)
- The produced polysilicon is used as wafers in large amounts by the photovoltaic industry for conventional solar cells made of crystalline silicon and also by the semiconductor industry. (wikipedia.org)
- Build compound semiconductor devices on silicon substrates. (semiconductor-today.com)
- Regarding the first challenge, to grow working devices Intel first grows a buffer layer to absorb most of the lattice mismatch between the compound semiconductor and the silicon (which produces the defects that degrade device performance). (semiconductor-today.com)
- The creation of an impurity into silicon as a semiconductor boosts it into comprehensive conduction. (chitoku.net)
- In the case of trimethylsilyl chloride, the hydrolyzed product is hexamethyldisiloxane: 2 ((CH3)3SiCl + H2O → [(CH3)3Si]2O + 2 HCl The analogous reaction of dimethyldichlorosilane gives siloxane polymers or rings: n (CH3)2SiCl2 + n H2O → [(CH3)2SiO]n + 2n HCl Silicon tetrachloride and trichlorosilane are intermediates in the production of ultrapure silicon in the semiconductor industry. (wikipedia.org)
Sulfur7
- The reactions of silicon difluoride with several sulfur containing compounds have been investigated in an attempt to synthesize compounds containing the silicon-sulfur bond. (rice.edu)
- Of the previous reactions of silicon difluoride with sulfur compounds, only two, the hydrogen sulfide and sulfur reactions, produced compounds containing silicon-sulfur bonds. (rice.edu)
- It may be possible to produce compounds of this sort by reacting SiF2 with thiocarbonyl compounds and sulfur monohalides or by reacting gaseous SiS or SiS2 with various reagents. (rice.edu)
- Compounds containing sulfur. (elsevier.com)
- Compounds wherein the metal is bonded directly to the singly bonded chalcogen of a group, in which the X's are the same or diverse chalcogens (i.e., oxygen, sulfur, selenium, or tellurium), which group is additionally attached directly or indirectly to the six-membered hetero ring by nonionic bonding. (uspto.gov)
- Compounds wherein the metal is bonded directly to a chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) which is attached directly or indirectly to the six-membered hetero ring by nonionic bonding. (uspto.gov)
- chlorine and potassium (from the flux added before soldering), and sulfur and silicon, indicating that these elements were integral to the soldering process. (cdc.gov)
Bonds6
- Compounds which contain silicon-nitrogen bonds are known. (google.com)
- Compounds which contain a piperidine ring, i.e., a six-membered hetero ring consisting of one ring nitrogen and five ring carbons with no double bonds between ring members. (uspto.gov)
- We wanted to know, and discovered that enzymes that forge carbon-silicon bonds could be evolved in a test tube . (newscientist.com)
- All of these compounds are built from tetrahedral units with silicon as the central atom and are basically extended networks based on Si-O-Si bonds [ 3 ]. (hindawi.com)
- Scientists at Caltech have "bred" a bacterial protein with the ability to make silicon-carbon bonds, with applications in several industries - something only chemists could do before. (kurzweilai.net)
- Organosilicon compounds contain carbon-silicon bonds. (bigthink.com)
Potting Compound2
- The number of potting compound formulations on the market is as varied as their potential applications. (epicresins.com)
- Epic S7281 is a two-component aliphatic polyurethane potting compound designed with a fast cure and convenient 1:1 mix ratio by volume. (epicresins.com)
Methyl6
- Mechanistic studies of hydrosilylation using an optically active silane substrate, R-(+)-methyl-(1-naphthyl)phenylsilane, proceeded with predominant stereochemical retention at silicon, consistent with a carbonyl activation pathway. (osti.gov)
- The also preferred are those silicon compounds in which a is 0, c is 3, R12 is branched alkyl or cycloalkyl, containing optionally a heteroatom, and R13 is methyl, for example, cyclohexyltrimethoxysilane and the like. (allindianpatents.com)
- The also preferred are those silicon compounds in which a is 0, c is 3, R 12 is branched alkyl or cycloalkyl, containing optionally heteroatom, and R 13 is methyl, for example, cyclohexyltrimethoxysilane and the like. (justia.com)
- Silanes, siloxanes, and silicones are commercially produced from silicon and methyl chloride in a process known as the "direct reaction" or the "Rochow-Muller direct process. (encyclopedia.com)
- This reaction yields methylchlorosilanes (silicon compounds containing both methyl groups and chlorine). (encyclopedia.com)
- A method of preparing poly(methyl- or ethyl-silyne) and silicon carbide ceramics therefrom. (wikipedia.org)
OXIDES2
- As outlined by Hornbostel, Silicon oxides are widely-used as design components. (chitoku.net)
- Silicon must be freed from its oxides through a chemical process known as carbothermic reduction. (encyclopedia.com)
Lapping Compound3
- Beaver Lapping Compound is a silicon carbide grease base lapping compound. (geebeefoto.nl)
- 600-Grit Lapping Compound - E-Z Bore, Inc. (geebeefoto.nl)
- Our endless aisle includes a loctite lapping compound and so much more! (kine-licht.be)
Hydrogen6
- In particular, in propylene polymerization, catalyst systems comprising the silicon ether compounds as external electron donor component exhibit good hydrogen response, and can be used to prepare polymer having high isotacticity at high yield. (allindianpatents.com)
- However, the inventors have surprisingly found that, when used as external electron donor in olefins polymerization, especially in propylene polymerization, silicon ether compounds of general formula (I), which will be described in detail hereinbelow, exhibit good properties, for instance, the catalyst systems exhibit good hydrogen response, and can be used to prepare polymer having high isotacticity at high yield. (allindianpatents.com)
- Other compounds of carbon, hydrogen and oxygen. (elsevier.com)
- Compounds of carbon are classified as organic when carbon is bound to hydrogen. (britannica.com)
- They are prepared by the Müller-Rochow process, which involves treating silicon with hydrogen chloride at elevated temperatures in the presence of a copper catalyst. (wikipedia.org)
- Chlorosilanes obtained from crude silicon are purified by fractional distillation techniques and then reduced with hydrogen to give silicon of 99.999999999% purity. (wikipedia.org)
Carbonyl3
- Wittig reagents, Horner-Wadsworth-Emmons reagents and other reagents for converting carbonyl compounds to olefins are listed. (tcichemicals.com)
- Acetals convert to carbonyl compounds. (wikipedia.org)
- Thus, methyltrichlorosilane can be used to remove acetal protecting groups from carbonyl compounds under mild conditions. (wikipedia.org)
Organosilicon compound2
- Although the direct reaction is used to commercially produce silicon-based materials today, the first example of an organosilicon compound (a material containing a silicon-carbon bond) was described in 1863 (as the U.S. Civil War raged and author Mark Twain was just beginning his literary career). (encyclopedia.com)
- Methyltrichlorosilane, also known as trichloromethylsilane, is an organosilicon compound with the formula CH3SiCl3. (wikipedia.org)
Reaction1
- Methanol converts it to trimethoxymethylsilane: MeSiCl3 + 3 CH3OH → MeSi(OCH3)3 + 3 HCl Reduction of methyltrichlorosilane with alkali metals forms a highly crosslinked material called poly(methylsilyne): n MeSiCl3 + 3n Na →[MeSi]n + 3n NaCl The reaction illustrates the susceptibility of silicon halides to reductive coupling. (wikipedia.org)
Silicate2
- Effect of silicate and modified aluminosilicate compounds on Cd and Zn toxicity for some crops. (degruyter.com)
- Silicate compounds that have SiO 4 -4 units also exist in such minerals as feldspars, micas, zeolites or talcs. (scientificamerican.com)
BORON1
- for compounds containing boron. (uspto.gov)
Reagents1
- But despite years of work--and despite all the reagents available to the modern alchemist--many silicon analogs of carbon compounds just cannot be formed. (scientificamerican.com)
Carbide Grease Mix3
- 1 (lb) pound can -- Loctite/Clover brand 600 grit - 4A - Silicon Carbide Grease Mix - Super Fine Lapping and Grinding Compound Clover brand compounds have been the choice of mechanics for over 80 years. (geebeefoto.nl)
- LOCTITE® Clover® Silicon Carbide Grease Mix is the most widely used. (kine-licht.be)
- Clover Silicon Carbide Grease Mix Is A Standard Abrasive Paste For Fast Metal Removal. (kine-licht.be)
Olefins3
- The present invention relates to silicon ether compounds having a general formula (I), a method for the preparation thereof and use thereof as a component of catalysts for polymerization of olefins. (allindianpatents.com)
- In the prior art, 2,2-dihydrocarbyl-1-hydrocarbyloxy-3-(trihydrocarbylsilyloxy)propane compounds have never been used as external electron donor compounds in olefins polymerization. (allindianpatents.com)
- The process for the production of light olefins from a feedstock comprising at least an aliphatic hetero compound comprising contacting said feedstock with a silicoaluminophosphate molecular sieve of U.S. Pat. (google.es)
Cyclic2
- Electron transfer from cyclic silicon compounds to photo-excited C 60 in polar solvents has been investigated by laser photolysis with observation of the transient absorption bands in the near-IR region. (elsevier.com)
- an especially prominent difference was observed for four-membered cyclic compounds. (elsevier.com)
Chlorine2
- Chlorosilanes are a group of reactive, chlorine-containing chemical compounds, related to silane and used in many chemical processes. (wikipedia.org)
- Each such chemical has at least one silicon-chlorine bond. (wikipedia.org)
SiCl2
- Silicon tetrachloride or tetrachlorosilane is the inorganic compound with the formula SiCl 4 . (wikipedia.org)
- The parent chlorosilane is Silicon tetrachloride (SiCl 4). (wikipedia.org)
Silicone Rubber Compound3
- Silicone Rubber Compound for Molding Keypad Bracelet Silicone Rubber Seal Description RUI-HE 6250-60M® is a type of hard silicone with hardness Shore A 60. (spintoband.com)
- videoId:"I2BOIpfIibA",idContainer:"#AovaJjF"}) 5.0mm Gasket With Three Layers Silicone Rubber Compound Two layers Fiberglass Cloth Description of Three Layers Silicone Rubber Compound Two Layers Fiberglass Cloth 1. (spintoband.com)
- High Quality Silicone Rubber Compound for Elect. (ecvv.com)
Reactions1
- it lacked any detailed account of the reactions of the silicon-nitrogen bond. (docme.ru)
Nitrogen5
- This omission has now been rectified, in that this recent 'Update' volume includes a chapter on the silicon-nitrogen bond, together with an appendix to the Si-N chapter covering publications over the past few years. (docme.ru)
- Silicon-nitrogen compounds. (growkudos.com)
- The harsh conditions do not permit the preparation of silicon-nitrogen compounds with all varieties of functional groups. (google.com)
- Compounds containing nitrogen. (elsevier.com)
- Compounds which contain an acyclic nitrogen atom or an azide group. (uspto.gov)
Functionalized surfaces1
- The functionalized silicon compounds may be covalently attached to surfaces to form functionalized surfaces which may be used in a wide range of different applications. (google.co.uk)
Oxide1
- Quartz forms the pure shape of silicon oxide and is also utilised in cosmetic sunglasses who are used by engineering. (chitoku.net)
Clover3
- The Clover silicon carbide paste has consistent grain size and finish qualities for most machinery appliions. (geebeefoto.nl)
- LOCTITE® Clover Silicon Carbide Pat Gel Water Mix, paste formulation for fast metal removal. (geebeefoto.nl)
- Loctite Clover Compound Grit 220 Fluid Abrasive 1lb. (kine-licht.be)
Substances2
- At room in your home environment, silicon is non-active with drinking water, much needed oxygen, all acids along with substances. (chitoku.net)
- Today the term is often used as a generic for nearly all substances that contain a silicon atom. (encyclopedia.com)
Encapsulants1
- Such versatility in formulating effective encapsulants and potting compounds leads to a range of questions, and the most commonly asked are "What about silicone-based potting compounds? (epicresins.com)
Polymeric2
- Polymeric forms of Al 13 and Si compounds are examples of mineral sorbents that influence metals' toxicity in the environment. (degruyter.com)
- Silicon yields polymeric silicones, which we use to waterproof cloth or lubricate metal and plastic parts. (scientificamerican.com)
Substrates1
- We have to figure out how to make these in high volumes, which would be impossible if we were limited to small GaAs wafers as starting material [150mm, compared to 300mm-diameter silicon substrates]. (semiconductor-today.com)
Products11
- The Solarite KM-2740 Series of RTV (Room Temperature Vulcanizing), two-component silicones offers a broad range of features with greater economy than other silicone products on the market. (adhesivesmag.com)
- This seminar presents the range of WACKER's high-quality silicone products for silicone rubber compounding applications. (wacker.com)
- The partnership will enhance GCL-Poly's overall competitiveness by diversifying the silicon products, better serving its main business, and meeting market demand,' said Zhu Gongshan, Chairman of GCL-Poly. (coatingsworld.com)
- Common products contain complex mixtures of Endocrine-disrupting compounds and asthma-related compounds. (ctdbase.org)
- 153 silicon carbide paste products are offered for sale by suppliers on Alibaba A wide variety of silicon carbide paste options are available to you, There are 154 suppliers who sells silicon carbide paste on Alibaba, mainly loed in Asia. (geebeefoto.nl)
- Bluestar Silicones and Basoğlu Kablo join forces to create a rubber compounding center in Turkey to serve customers with technical products adapted to local requirements. (elkem.com)
- We doesn't provide silicone rubber compounding products or service, please contact them directly and verify their companies info carefully. (spintoband.com)
- Diversified application of Silicon-centred systems in businesses, consumer electronics and personal computers, products in the home, textiles, construction, and cars will make it one of many superb crucial elements inside globe now. (chitoku.net)
- Molecules with silicon-carbon ( organosilicon ) compounds are found in pharmaceuticals and many other products, including agricultural chemicals, paints, semiconductors, and computer and TV screens. (kurzweilai.net)
- See more Silicon products. (americanelements.com)
- Each day, we unknowingly come into contact with scores of products that contain silicones for the very special properties that they possess. (encyclopedia.com)
Siloxanes1
- They are distilled (purified), and the isolated dimethyldichlorosilane is hydrolyzed to give siloxanes and silicones. (encyclopedia.com)
Elemental2
- A persistent contender as an alternative elemental basis for life is silicon, mainly due to the chemical analogies between silicon and carbon. (mdpi.com)
- Commercially, it has many uses, and it is the only source of elemental silicon. (encyclopedia.com)
Abrasive7
- 7/10/2015· Silicon Carbide Grit is the hardest abrasive media. (geebeefoto.nl)
- Silicon carbide is a very sharp pointed abrasive grain that continually breaks down to leave a fine finish. (geebeefoto.nl)
- Resin Compound Synthetic Frankfurt Abrasive is bonded with both resin and silicon carbide for marble grinding and polishing. (geebeefoto.nl)
- With coined advantage of resin and silicon carbide, this compound Frankfurt abrasive is more adaptable to all hardness marble materials and makes more aggressive grinding and polishing on marble surfaces, resulted in honed marble surface. (geebeefoto.nl)
- 3M™ Finesse-It™ Marine Paste Compound brings the appearance of boats back to life by the use of aggressive abrasive mineral to cut through heavy oxidation and chalky film to renew faded gelcoats. (3m.com)
- The abrasive mineral in the compound also allows you to remove minor scratches, rust and exhaust stains from gelcoat finishes. (3m.com)
- Apply the compound and rub it in a circular motion to allow the abrasive mineral to cut through oxidation, grime and filmy residue. (3m.com)
Centers1
- Basoğlu Kablo being in the silicone rubber business for over 20 years and having acquired all the necessary technical information and equipment will be offering in Turkey and surrounding territories compounded HCR for highly technical applications based on the knowhow and expertise of Bluestar Silicones Mix & Fix centers. (elkem.com)
Tetrachloride7
- Ultra-pure silicon tetrachloride, marketed under the Siridion® STC HP brand name, is used in the fiber optics needed to expand China's communications and IT infrastructure. (coatingsworld.com)
- The growth rate for ultra-pure silicon tetrachloride in China is well above the growth rate for the global market. (coatingsworld.com)
- Silicon tetrachloride is a classic electrophile in its reactivity. (wikipedia.org)
- Silicon tetrachloride is used as an intermediate in the manufacture of polysilicon , a hyper pure form of silicon, [3] since it has a boiling point convenient for purification by repeated fractional distillation . (wikipedia.org)
- Silicon tetrachloride reappears in both these two processes as a by-product and is recycled in the hydrogenation reactor. (wikipedia.org)
- High purity silicon tetrachloride is used in the manufacture of optical fibres. (wikipedia.org)
- dichlorosilane (H2SiCl2) and silicon tetrachloride (SiCl4) are obtained as byproducts. (wikipedia.org)
Rubber4
- Bluestar Silicones believes that this new cooperation will be a milestone for the silicone rubber business in Turkey and will serve as a springboard for the promotion of the compounds in nearby countries. (elkem.com)
- All silicone rubber compounding wholesalers & silicone rubber compounding manufacturers come from members. (spintoband.com)
- 12 Inch 14 Inch Automatic nip adjustment silicone rubber mixing mill / open mixing mill / rubber compound two roll mill Brief description: 1. (spintoband.com)
- the blocked mercaptosilanes can be used in rubber compounds. (freepatentsonline.com)
Chemical Compound1
- Chemical Compound: What Is Silicon Tetrabromide? (smallbusinessbrief.com)
Solvents2
- To expand the possibility of plausible silicon biochemistry, we explore silicon's chemical complexity in diverse solvents found in planetary environments, including water, cryosolvents, and sulfuric acid. (mdpi.com)
- Poly(methylsilyne) is soluble in organic solvents, and can be applied to surfaces before being pyrolyzed to give the ceramic material, silicon carbide. (wikipedia.org)
Silicates1
- Silicon shares many similarities with carbon and is, in the form of various silicates in rocks, the second most abundant element (after oxygen) in Earth's crust [ 8 ]. (mdpi.com)
Epoxy1
- This epoxy system coines the abrasion resistance qualities of both large and small ceramic beads and silicon carbide. (kine-licht.be)
Organometallic2
- They give an excellent overview of current research into many areas of tin and silicon, encompassing both inorganic and organometallic derivatives and fundamental and applied studies. (docme.ru)
- Since the discovery of hydroformylation by O. Roelen in 1938, catalytic applications have paved the way of organometallic compounds in industry. (wiley.com)
Material9
- One such material is the compound indium gallium arsenide, which is already used in fiber-optic communication and radar technologies, and is known to have extremely good electrical properties, del Alamo says. (cellular-news.com)
- But despite recent advances in treating the material to allow it to be formed into a transistor in a similar way to silicon, nobody has yet been able to produce devices small enough to be packed in ever-greater numbers into tomorrow's microchips. (cellular-news.com)
- Electronic potting and encapsulating compounds supplied by Epic Resins are formulated to provide consistent material performance to achieve the most exacting electronic potting application properties. (epicresins.com)
- With worldwide operations headquartered in Lyon, France, Bluestar Silicones is a $650 million worldwide silicones raw material manufacturer. (elkem.com)
- No. 3,681,266, a distinct class of acylaminoorganosilicon compounds was fluorine modified to provide a coating material that is useful as a water repellant. (google.com)
- No. 3,720,699, a new and useful class of haloorganoacylaminoorganosilicon compounds are reported to be useful as a coating material. (google.com)
- Your absolutely pure and impure style of silicon is inflexible and complicated, a good reason why it can be popular being a establishing material. (chitoku.net)
- Because our compound doesn't dry out too quickly, it allows a greater area to be compounded with less material. (3m.com)
- Bouncing Putty, later sold as Silly Putty ® , is an example of a silicon-based material with very unusual properties. (encyclopedia.com)
Ferrosilicon2
- In the sub-cohorts of the ferrosilicon/silicon metal and silicon carbide industries, the differences between oven operators and non-exposed workers were -2.3 (-4.3 to -0.3) and -5.6 (-10.4 to -0.7) mL/(m 2 ) x year), respectively. (ilo.org)
- The metalloid is rarely found in pure crystal form and is usually produced from the iron-silicon alloy ferrosilicon. (americanelements.com)
Thermal2
- Silicon carbide tubes served as components in industrial furnaces and thermal couple protectors, and components made by silicon carbide are replacing metal parts in some turbo engines. (geebeefoto.nl)
- The main advantage of silicone potting compounds is the material's elevated thermal resistance (over 160°C) while offering a soft polymer. (epicresins.com)
Molecular1
- When any one enzyme "mates" with compounds it is helping to react, the two molecular shapes fit together like a lock and key, or a shake of hands. (scientificamerican.com)
Grease1
- Directions on project I'm doing call for silicon grease. (diyaudio.com)
Electron7
- An internal electron donor compound for preparing .alpha. (patents.com)
- and external electron donor component, typically organo-silicon compound. (allindianpatents.com)
- At present, the types of external electron donor compounds have developed from initial benzoates to current organosiloxane. (allindianpatents.com)
- It is noted that, among the silicon compounds having the general formula R11aR12bSi(OR13)c, those silicon compounds in which c is 1 are generally not deemed as good external electron donor. (allindianpatents.com)
- The rate constant (k et ) and quantum yield (Φ et ) of electron transfer decrease with an increase in the number of silicon units. (elsevier.com)
- We've previously shown that you could achieve more than 10x improvement in power for an InSb device operating at 0.5V compared to the equivalent silicon device [reported at December 2005's IEEE International Electron Devices Meeting]," he says. (semiconductor-today.com)
- Consequently, earlier this month Intel reported the fabrication of what Mayberry claims are the first high-performance compound devices on silicon (IEEE Electron Device Letters, Vol. 28, No. 8, August 2007, pp.685). (semiconductor-today.com)