The generic term for salts derived from silica or the silicic acids. They contain silicon, oxygen, and one or more metals, and may contain hydrogen. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th Ed)
A generic term for a variety of compounds that contain silicon, oxygen, and magnesium, and may contain hydrogen. Examples include TALC and some kinds of ASBESTOS.
A relatively hard, translucent, restorative material used primarily in anterior teeth. (From Boucher's Clinical Dental Terminology, 4th ed, p50)
Any of the numerous types of clay which contain varying proportions of Al2O3 and SiO2. They are made synthetically by heating aluminum fluoride at 1000-2000 degrees C with silica and water vapor. (From Hawley's Condensed Chemical Dictionary, 11th ed)
Inorganic compounds that contain calcium as an integral part of the molecule.
A hydrated form of silicon dioxide. It is commonly used in the manufacture of TOOTHPASTES and as a stationary phase for CHROMATOGRAPHY.
Inorganic compounds that contain magnesium as an integral part of the molecule.
Finely divided solid matter with particle sizes smaller than a micrometeorite, thus with diameters much smaller than a millimeter, moving in interplanetary space. (NASA Thesaurus, 1994)
Any solid objects moving in interplanetary space that are smaller than a planet or asteroid but larger than a molecule. Meteorites are any meteoroid that has fallen to a planetary surface. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
The reactions and interactions of atoms and molecules, the changes in their structure and composition, and associated energy changes.
The science concerned with celestial bodies and the observation and interpretation of the radiation received in the vicinity of the earth from the component parts of the universe (McGraw Hill Dictionary of Scientific and Technical Terms, 5th ed)
The group of celestial bodies, including the EARTH, orbiting around and gravitationally bound by the sun. It includes eight planets, one minor planet, and 34 natural satellites, more than 1,000 observed comets, and thousands of lesser bodies known as MINOR PLANETS (asteroids) and METEOROIDS. (From Academic American Encyclopedia, 1983)
Aggregates of matter in outer space, such as stars, planets, comets, etc. and the properties and processes they undergo.
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].
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.
Organic and inorganic compounds that contain iron as an integral part of the molecule.
The environment outside the earth or its atmosphere. The environment may refer to a closed cabin (such as a space shuttle or space station) or to space itself, the moon, or other planets.
Creation and development of bodies within solar systems, includes study of early planetary geology.
Any of several processes for the permanent or long-term artificial or natural capture or removal and storage of carbon dioxide and other forms of carbon, through biological, chemical or physical processes, in a manner that prevents it from being released into the atmosphere.
Devices, manned and unmanned, which are designed to be placed into an orbit about the Earth or into a trajectory to another celestial body. (NASA Thesaurus, 1988)
The fifth planet in order from the sun. It is one of the five outer planets of the solar system. Its sixteen natural satellites include Callisto, Europa, Ganymede, and Io.
Inorganic compounds that contain aluminum as an integral part of the molecule.
Any waste product generated by a dental office, surgery, clinic, or laboratory including amalgams, saliva, and rinse water.
A form of SILICON DIOXIDE composed of skeletons of prehistoric aquatic plants which is used for its ABSORPTION quality, taking up 1.5-4 times its weight in water. The microscopic sharp edges are useful for insect control but can also be an inhalation hazard. It has been used in baked goods and animal feed. Kieselguhr is German for flint + earthy sediment.
A colloidal, hydrated aluminum silicate that swells 12 times its dry size when added to water.
Celestial bodies orbiting around the sun or other stars.
Synthetic organosiloxane gels that are formed from synthetic polymers of silicone oxide with organic sidechains (polydimethylsiloxane) by lengthening the polymer chains. Unlike silicone elastomers, they are not treated with amorphous silica. They are used as fillers in breast implants.
Implants used to reconstruct and/or cosmetically enhance the female breast. They have an outer shell or envelope of silicone elastomer and are filled with either saline or silicone gel. The outer shell may be either smooth or textured.
Destruction by passage of a galvanic electric current, as in disintegration of a chemical compound in solution.
A metallic element that has the atomic number 13, atomic symbol Al, and atomic weight 26.98.
Products made by baking or firing nonmetallic minerals (clay and similar materials). In making dental restorations or parts of restorations the material is fused porcelain. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed & Boucher's Clinical Dental Terminology, 4th ed)
The ash, dust, gases, and lava released by volcanic explosion. The gases are volatile matter composed principally of about 90% water vapor, and carbon dioxide, sulfur dioxide, hydrogen, carbon monoxide, and nitrogen. The ash or dust is pyroclastic ejecta and lava is molten extrusive material consisting mainly of magnesium silicate. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
The adhesion of gases, liquids, or dissolved solids onto a surface. It includes adsorptive phenomena of bacteria and viruses onto surfaces as well. ABSORPTION into the substance may follow but not necessarily.
A rare metal element with a blue-gray appearance and atomic symbol Ge, atomic number 32, and atomic weight 72.63.
A calcium salt that is used for a variety of purposes including: building materials, as a desiccant, in dentistry as an impression material, cast, or die, and in medicine for immobilizing casts and as a tablet excipient. It exists in various forms and states of hydration. Plaster of Paris is a mixture of powdered and heat-treated gypsum.
The fourth planet in order from the sun. Its two natural satellites are Deimos and Phobos. It is one of the four inner or terrestrial planets of the solar system.
Pollution prevention through the design of effective chemical products that have low or no toxicity and use of chemical processes that reduce or eliminate the use and generation of hazardous substances.
Native, inorganic or fossilized organic substances having a definite chemical composition and formed by inorganic reactions. They may occur as individual crystals or may be disseminated in some other mineral or rock. (Grant & Hackh's Chemical Dictionary, 5th ed; McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Administration of a soluble dosage form between the cheek and gingiva. It may involve direct application of a drug onto the buccal mucosa, as by painting or spraying.
Compounds similar to hydrocarbons in which a tetravalent silicon atom replaces the carbon atom. They are very reactive, ignite in air, and form useful derivatives.
Stable oxygen atoms that have the same atomic number as the element oxygen, but differ in atomic weight. O-17 and 18 are stable oxygen isotopes.
Substances used to bond COMPOSITE RESINS to DENTAL ENAMEL and DENTIN. These bonding or luting agents are used in restorative dentistry, ROOT CANAL THERAPY; PROSTHODONTICS; and ORTHODONTICS.
Substances made up of an aggregation of small particles, as that obtained by grinding or trituration of a solid drug. In pharmacy it is a form in which substances are administered. (From Dorland, 28th ed)
Long, pliable, cohesive natural or manufactured filaments of various lengths. They form the structure of some minerals. The medical significance lies in their potential ability to cause various types of PNEUMOCONIOSIS (e.g., ASBESTOSIS) after occupational or environmental exposure. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed, p708)
The natural satellite of the planet Earth. It includes the lunar cycles or phases, the lunar month, lunar landscapes, geography, and soil.
Technique whereby the weight of a sample can be followed over a period of time while its temperature is being changed (usually increased at a constant rate).
Material from which the casting mold is made in the fabrication of gold or cobalt-chromium castings. (Boucher's Clinical Dental Terminology, 4th ed, p168)
The testing of materials and devices, especially those used for PROSTHESES AND IMPLANTS; SUTURES; TISSUE ADHESIVES; etc., for hardness, strength, durability, safety, efficacy, and biocompatibility.
Hard, amorphous, brittle, inorganic, usually transparent, polymerous silicate of basic oxides, usually potassium or sodium. It is used in the form of hard sheets, vessels, tubing, fibers, ceramics, beads, etc.
Salts or ions of the theoretical carbonic acid, containing the radical CO2(3-). Carbonates are readily decomposed by acids. The carbonates of the alkali metals are water-soluble; all others are insoluble. (From Grant & Hackh's Chemical Dictionary, 5th ed)

Biochemical evolution III: polymerization on organophilic silica-rich surfaces, crystal-chemical modeling, formation of first cells, and geological clues. (1/442)

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)

A role for the mannose-sensitive hemagglutinin in biofilm formation by Vibrio cholerae El Tor. (2/442)

While much has been learned regarding the genetic basis of host-pathogen interactions, less is known about the molecular basis of a pathogen's survival in the environment. Biofilm formation on abiotic surfaces represents a survival strategy utilized by many microbes. Here it is shown that Vibrio cholerae El Tor does not use the virulence-associated toxin-coregulated pilus to form biofilms on borosilicate but rather uses the mannose-sensitive hemagglutinin (MSHA) pilus, which plays no role in pathogenicity. In contrast, attachment of V. cholerae to chitin is shown to be independent of the MSHA pilus, suggesting divergent pathways for biofilm formation on nutritive and nonnutritive abiotic surfaces.  (+info)

Origin of graphitic carbon and pentlandite in matrix olivines in the Allende meteorite. (3/442)

Matrix olivines in the Allende carbonaceous chondrite are believed to have formed by condensation processes in the primitive solar nebula. However, transmission electron microscope observations of numerous matrix olivines show that they contain abundant, previously unrecognized, nanometer-sized inclusions of pentlandite and poorly graphitized carbon. Neither of these phases would have been stable at the high-temperature conditions required to condense iron-rich olivine in the solar nebula. The presence of these inclusions is consistent with formation of the olivines by parent body processes that involved overgrowth of fine-grained organic materials and sulfides in the precursor matrix materials.  (+info)

Stable five- and six-coordinated silicate anions in aqueous solution. (4/442)

Addition of aliphatic polyols to aqueous silicate solutions is shown to yield high concentrations of stable polyolate complexes containing five- or six-coordinated silicon. Coordinating polyols require at least four hydroxy groups, two of which must be in threo configuration, and coordinate to silicon via hydroxy oxygens at chain positions on either side of the threo pair. The remarkable ease by which these simple sugar-like molecules react to form hypervalent silicon complexes in aqueous solution supports a long-standing supposition that such species play a significant role in the biological uptake and transport of silicon and in mineral diagenesis.  (+info)

An infrared spectral match between GEMS and interstellar grains. (5/442)

Infrared spectral properties of silicate grains in interplanetary dust particles (IDPs) were compared with those of astronomical silicates. The approximately 10-micrometer silicon-oxygen stretch bands of IDPs containing enstatite (MgSiO3), forsterite (Mg2SiO4), and glass with embedded metal and sulfides (GEMS) exhibit fine structure and bandwidths similar to those of solar system comets and some pre-main sequence Herbig Ae/Be stars. Some GEMS exhibit a broad, featureless silicon-oxygen stretch band similar to those observed in interstellar molecular clouds and young stellar objects. These GEMS provide a spectral match to astronomical "amorphous" silicates, one of the fundamental building blocks from which the solar system is presumed to have formed.  (+info)

Windows through the dusty disks surrounding the youngest low-mass protostellar objects. (6/442)

The formation and evolution of young low-mass stars are characterized by important processes of mass loss and accretion occurring in the innermost regions of their placentary circumstellar disks. Because of the large obscuration of these disks at optical and infrared wavelengths in the early protostellar stages (class 0 sources), they were previously detected only at radio wavelengths using interferometric techniques. We have detected with the Infrared Space Observatory the mid-infrared (mid-IR) emission associated with the class 0 protostar VLA1 in the HH1-HH2 region located in the Orion nebula. The emission arises in three wavelength windows (at 5. 3, 6.6, and 7.5 micrometers) where the absorption due to ices and silicates has a local minimum that exposes the central part of the young protostellar system to mid-IR investigations. The mid-IR emission arises from a central source with a diameter of 4 astronomical units at an averaged temperature of approximately 700 K, deeply embedded in a dense region with a visual extinction of 80 to 100 magnitudes.  (+info)

Age of Neoproterozoic bilatarian body and trace fossils, White Sea, Russia: implications for metazoan evolution. (7/442)

A uranium-lead zircon age for a volcanic ash interstratified with fossil-bearing, shallow marine siliciclastic rocks in the Zimnie Gory section of the White Sea region indicates that a diverse assemblage of body and trace fossils occurred before 555.3 +/- 0.3 million years ago. This age is a minimum for the oldest well-documented triploblastic bilaterian Kimberella. It also makes co-occurring trace fossils the oldest that are reliably dated. This determination of age implies that there is no simple relation between Ediacaran diversity and the carbon isotopic composition of Neoproterozoic seawater.  (+info)

Porous apatite-wollastonite glass-ceramic as an intramedullary plug. (8/442)

We evaluated the efficacy and biocompatibility of porous apatite-wollastonite glass ceramic (AW-GC) as an intramedullary plug in total hip replacement (THR) for up to two years in 22 adult beagle dogs. Cylindrical porous AW-GC rods (70% porosity, mean pore size 200 microm) were prepared. Four dogs were killed at 1, 3, 6 and 12 months each and six at 24 months after implantation. Radiological evaluation confirmed the efficacy of porous AW-CG as an intramedullary plug. Histological evaluation showed osteoconduction at one month and resorption of the porous AW-GC, which was replaced by newly-formed bone, at 24 months. Our findings indicate that porous AW-GC can be used clinically as an intramedullary plug in THR.  (+info)

The frequency and significance of cervicomediastinal lymph node metastases have been investigated in 82 medullary thyroid carcinoma (MTC) patients retrospectively comparing two surgical techniques of lymph node dissection: selective lymphadenectomy (n = 63) versus compartment-oriented microdissection (n = 35). No positive correlation was observed between primary tumor size and the number of lymph node metastases. Inpatients with lymph node metastases proven histologically, 42% showed only cervical involvement (35% unilateral-type A, 7% bilateral-type B, and 22% cervicomediastinal lymph node involvement (15% cervico-unilateral and mediastinal-type C, 7% cervicobilateral and mediastinal-type D). Biochemical cure was 83% in node-negative patients but only 21% in node-positive patients. In node-positive MTC, calcitonin normalization was achieved in none with bilateral lymph node involvement but only in those unilateral lymph node metastases (31% in type A, 17% in type C). Survival and biochemical cure are
The major growth driver for the global active calcium silicate market is the recent recovery in the construction industry after the economic recession. Increasing spending on the residential and commercial construction projects have positively influenced the global active calcium silicate market. The increasing demand for the passive fire protection and acoustic insulation are expected to spur the application of active calcium silicate in the future. Regulatory standards implemented by various regulatory bodies such as OSHA and NIOSH demand addition of extra safety features to the building structures and are expected to augment the active calcium silicate market. Active calcium silicate are mainly used in the building walls, blast furnaces, electric arc furnaces and oil refineries. Thus, the growing high temperature insulation application scope in the steel, glass and petrochemical industries propel the market of active calcium silicates. In addition to this, the introduction of products that ...
A silicate is a compound containing an anionic silicon compound. The great majority of the silicates are oxides, but hexafluorosilicate ([SiF6]2−) and other anions are also included. Orthosilicate is the anion SiO4− 4 or its compounds. Related to orthosilicate are families of anions (and their compounds) with the formula [SiO2+n]2n−. Important members are the cyclic and single chain silicates {[SiO3]2−}n and the sheet-forming silicates {[SiO2.5]−}n. Silicates constitute the majority of Earths crust, as well as the other terrestrial planets, rocky moons, and asteroids. Sand, Portland cement, and thousands of minerals are examples of silicates. Silicate compounds, including the minerals, consist of silicate anions whose charge is balanced by various cations. Myriad silicate anions can exist, and each can form compounds with many different cations. Hence this class of compounds is very large. Both minerals and synthetic materials fit in this class. In the vast majority of silicates, ...
TY - JOUR. T1 - IR spectroscopic investigation of the particle size and morphology of platinum nanoparticles supported on mesoporous silicate. AU - Molnár, É. AU - Konya, Z.. AU - Tasi, Gy. AU - Kiricsi, I.. PY - 2005/1/1. Y1 - 2005/1/1. N2 - Platinum supported on SBA-15 mesoporous silicate was prepared by a two-step procedure. The catalyst was characterized by TEM, XRD, MAS-NMR and IR spectroscopy and BET, TG-DTG measurements. The catalytic activity of the Pt containing silicate was investigated by IR spectroscopy using cyclohexene hydrogenation and dehydrogenation reaction. The changes occurred both in the gas phase and the adsorbed phase were monitored simultaneously. The quantitative analysis of the bands showed that even kinetic experiments could be performed using the set-up reported. We found that the catalytic activity is influenced by the size and shape of the Pt nanoparticles (the smaller the size the higher is the catalytic activity) and the preparation of the catalyst (the highest ...
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Silicate mineral, any of a group of silicon-oxygen compounds that are widely distributed throughout much of the solar system. The silicates make up about 95 percent of Earths crust and upper mantle, occurring as the major constituents of most igneous rocks.
The present invention relates to a regenerative material in the connective tissues (such as bone, dentin or pulp) regeneration field. More precisely, the present invention relates to a connective tissue regenerative material, preferably a bone, dentin or pulp regenerative material, comprising: - a porous polymer matrix having interconnected pores; and - non-hydrated calcium silicate particles; wherein: said polymer matrix is anhydrous; said non-hydrated calcium silicate particles have a dso granulometry, preferably ranging from 0.05 iim to less than the average diameter size of the pores of the matrix; and said non-hydrated calcium silicate particles being coated on the inside walls of the pores of the matrix. The present invention also relates to method for preparing said connective tissue regenerative material. The present invention also concerns uses of said regenerative materials, such as for example in the dental field; especially, for providing regenerative materials with improved
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The Amazing Acid Resistance of Potassium Silicate Concrete. You may not even notice potassium silicate concretes most amazing performance feat. Properly mixed and applied, you wont notice any sign of weakening after it is exposed to some of the strongest acids for days, weeks, or months on end. Unlike Portland Cement based concrete, potassium silicate based polymer concrete is resistant to immersion in all concentrations of nitric, hydrochloric, phosphoric acids, and sulfuric acids, including oleum. And with compressive strengths hovering around 4,000 psi, with appropriate design, it can be used for structural applications such as footings and foundations in acid-contaminated brownfield sites. What makes potassium silicate concrete resistant to acid? Lets first examine why Portland Cement based concrete is not resistant to acid. Portland Cement, the binder that holds the aggregate in concrete together is an alkaline material that reacts with acid. This reaction between the Portland Cement ...
A silicate mineral is generally an ionic compound whose anions consist predominantly of silicon and oxygen atoms. In most minerals in the Earths crust, each silicon atom is the center of an ideal tetrahedron, whose corners are four oxygen atoms covalently bound to it. Two adjacent tetrahedra may share a vertex, meaning that the oxygen atom is a bridge connecting the two silicon atoms. An unpaired vertex represents an ionized oxygen atom, covalently bound to a single silicon atom, that contributes one unit of negative charge to the anion. Some silicon centers may be replaced by atoms of other elements, still bound to the four corner oxygen corners. If the substituted atom is not normally tetravalent, it usually contributes extra charge to the anion, which then requires extra cations. For example, in the mineral orthoclase [KAlSi ...
This thesis deals with the analysis of presolar silicates and oxides by high resolution mass spectrometry and electron microscopy techniques. This stardust was identified by its extreme oxygen isotopic anomalies, which point to nucleosynthetic reactions in stellar interiors, in the carbonaceous chondrite Acfer 094. Isotopic, chemical and mineralogical studies on these stardust grains therefore allow the testing of astrophysical questions on Earth, which are otherwise only accessible by spectroscopy and theoretical models. The class of presolar silicates has been identified only six years ago in 2002, although it was known already from spectroscopic observations that silicates represent the most abundant type of dust in the galaxy. The development of the NanoSIMS was a crucial step in this respect, because this ion probe with its superior spatial resolution of only 50 nm allowed the detection of the typically 300 nm sized presolar silicates. A total of 142 presolar silicates and 20 presolar ...
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Calcium Silicate Definition - Calcium silicate is a chemical compound composed of calcium and silica with the chemical formula Ca2SiO4 that is...
Interaction between salts (NaCl, CsCl) and calcium silicate hydrates (C-S-H). Application of (super 29)Si homonuclear and (super 1)H-(super 29)Si heteronuclear NMR correlation to structural studies of calcium silicate hydrates
[82 Pages Report] Check for Discount on Global Calcium Silicate Insulation Boards Market Research Report 2011-2023 report by HeyReport. Summary The global Calcium Silicate Insulation Boards market will reach...
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The present invention provides synthetic, finely divided water-insoluble layered silicates having a smectite-like crystal phase, with increased contents of bound alkali and silicate and a distinctly reduced swelling power in aqueous suspension relative to pure layered silicates of this type. The synthetic layered silicate of this invention has the following oxide summation formula MgO.aM.sub.2 O.bAl.sub.2 O.sub.3.cSiO.sub.2.nH.sub.2 O wherein M is selected from the group consisting of sodium and a mixture of sodium and lithium said mixture having a molar ratio of sodium to lithium of at least about 2, n represents the number of water molecules bound in the crystal phase, and a, b, c and n each represent a number having a value within the following ranges: a is from about 0.05 to about 0.4 b is from 0 to about 0.3 c is from about 1.2 to about 2.0, and n is from about 0.3 to about 3.0.
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mineral - Silicate Minerals - The most widespread and numerous minerals are the silicates, which consist of silicon and oxygen combined with potassium, sodium, magnesium, aluminum, and many other elements. Silicates make up about 95 percent of the Earths crust and upper mantle. They comprise the major constituents of most igneous rocks and are prominent in sedimentary and metamorphic rock as well. Silicates have been identified in rock samples from the Moon as well as from meteorites and asteroids.…
Two generations of high-temperature silicate mineral assemblage occur in vesuvianite- and amphibolite-bearing calcitemarbles in the leucogneiss core of the Miocene M2 metamorphic complex of Naxos, Greece. The first (1p) generation formed during prograde metamorphism, whereas the second retrograde (2r) generation developed along contacts between prograde amphibolites and calcite marbles, in veins that crosscut pure marbles, and at the contacts between pegmatite-aplite bodies and calcite marble, and clearly grew during the infiltration of an external fluid into the marbles. Phase equilibrium calculations indicate a water-rich fluid. The oxygen isotope composition of 2r silicate minerals shows a significant decrease relative to the 1p composition in prograde marbles. The calculated δ18O values of water in isotopic equilibrium with the 2r silicate minerals (δ18O garnet = 9.0 to 9.6 ‰; δ18O clinopyroxene = 10.3 to 11.0 ‰; δ18O hornblende = 10.8 to 11.2 ‰) match those of water in equilibrium ...
Samples of calcium silicate hydrate (CSH) are prepared using either silica fume (SF) or nano-silica (NS) at different calcium to silicate ratio (0.81 molar and 2.4 molar). Experiments are thermal analysis, such as heat of hydration, calorimetry, Raman, X-Ray analysis (XRD), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Results are organised in MS Excel files and workbooks. Samples are denoted according the acronyms above reported for each technique used ...
Contact-metamorphosed carbonate rocks occur near a stock of quartz monzonite at Johnson Camp, in Chochise County, Arizona. The metamorphosed carbonate rocks show successive zones characterized by (1) chlorite (locally talc), (2) tremolite, (3) forsterite and diopside, and (4) garnet (with local wollastonite and idocrase), as the stock is approached. The mineralogical and textural changes indicate an origin of the silicate minerals by a fixed sequence of chemical reactions between original constituents of the sedimentary rock, with a negligible amount of material added from an outside source but with considerable interchange of material between beds. Silicate minerals generally did not form in pure carbonate rocks in any zone. The distinctive silicates of the outer three zones formed in abundance only in impure dolomites. Garnet, wollastonite, and idocrase of zone 4 formed only in impure limestones; the mineral assemblages in the once dolomitic rocks remained the same in zone 4 as in zone ...
Cyclosilicates (from Greek κύκλος kuklos, circle), or ring silicates, have linked tetrahedra with (TxO3x)2x− or a ratio of 1:3. These exist as 3-member (T3O9)6− and 6-member (T6O18)12− rings, where T stands for a tetrahedrally coordinated cation. Nickel-Strunz classification: 09.C. Examples are:. ...
Fundamental aspects of the synthesis, modification, characterization and catalytic testing of various silicate forms and metal nanoparticlemesoporous silicate composite materials. (2012. Oct. 03. 10:15) [Currently Displayed] ...
Baratovite is a very rare silicate mineral. It is extremely new on the mineral scene since it was only described in the last twenty five years. Baratovite is a cyclosilicate which means that the structure is composed of silicate tetrahedrons linked together so that they form isolated rings. Baratovite is one of the rare minerals that are coming out of the former USSR and finding their way onto the mineral markets. Baratovite has the look of muscovite but is easily distinguished by its brilliant blue fluorescence under ultra-violet light. ...
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In Texas, Rice University researchers developed packed, micron-scale calcium silicate spheres that could lead to stronger and greener concrete, the worlds most-used synthetic material. Many have been looking for biobased alternatives to concrete, but these spheres could help mitigate the energy-intensive techniques now used to make cement, the most common binder in concrete.. The researchers formed the spheres in a solution around nanoscale seeds of a common detergent-like surfactant. The spheres can be prompted to self-assemble into solids that are stronger, harder, more elastic and more durable than ubiquitous Portland cement. The spheres are also suitable for bone-tissue engineering, insulation, ceramic and composite applications as well as cement. ...
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Publications » Use of optimal mixture-process designs and response surface models to study properties of calcium silicate units ...
Surface water samples were collected from Langtang Lirung glacier outlet point to the Narayani river system in central Nepal in order to investigate the role of elevation in the variation of chemistry along the drainage networks. The chemistry of Langtang-Narayani river system was dominated by sulfide oxidation coupled with carbonate dissolution and weathering of silicate minerals. Calcium and magnesium concentrations were relatively higher than other cations and the sum of both species strongly correlated with alkalinity, supporting the dissolution of carbonate and dolomite as the dominant source for these ions. Aluminosilicate minerals primarily as albite and anorthite appeared as dominant silicate minerals within the drainage basin. Bisiallitization was the dominant type of weathering within the entire drainage system. Hydrogen ion concentration was lower in the low elevation sites than in high elevation sites reflecting the more consumption of carbon dioxide in the low elevation sites due to
The planets and larger rocky bodies of the inner solar system are differentiated, and consist of metallic, iron-rich cores surrounded by thick shells of silicate. Core formation in these bodies, i.e. the segregation of metal from silicate, was a key process in the early solar system, and one which left a lasting geochemical signature. It is commonly assumed that extensive silicate melting and formation of deep magma oceans was required to initiate core formation, due to the inability of iron-rich melts to segregate from a solid silicate matrix. Here we assess the role of deformation in aiding segregation of core-forming melts from solid silicate under conditions of planetary deep interiors. Low-strain rate, high-pressure/ temperature deformation experiments and high-resolution 2-D and 3-D textural analysis demonstrate that deformation fundamentally alters iron-rich melt geometry, promoting wetting of silicate grain boundaries and formation of extensive micron to sub-micron width Fe-rich melt bands.
Sodium aluminum silicate is a food additive used to prevent clumping. It is commonly found in powdered products such as artificial coffee creamers. It is s
Abstract: Stable organomineral derivatives are formed by reaction of organochlorosilanes with certain phyllosilicates. Organosiloxyl functions are grafted on silanol groups present at external mineral surfaces.. Water molecules adsorbed on external mineral surfaces may cause hydrolysis of the reactant organosilicon products, with liberation of HCl. This, in turn, may react with the silicate: octahedral cations are extracted from the lattice and fresh Si-OH groups, capable of further grafting, are formed on the mineral surface.. On the other hand, when difunctional reagents such as methylvinyldichlorosilane are used and if the ratio of adsorbed water to added reactive is adequate, then polymeric species with polysiloxane chains are grafted on the mineral.. Because of its high content of silanol groups, sepiolite forms organomineral compounds having a relatively high organic matter content. With chrysotile, the amount of organic matter grafted to the silicate, is considerably smaller, but it ...
Cobalt was successfully incorporated into an amorphous disordered mesoporous silica, TUD-1 using tetraethylene glycol (TEG) as a non-surfactant structure directing agent. The Si/Co ratio was varied (100, 50 and 25) and the prepared materials were characterized by various analytical and spectroscopic techniques, viz
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To answer the big questions, it often helps to look at the smallest details. That is the approach Stanford mineral physicist Wendy Mao is taking to understanding a major event in Earth\s inner history. Using a new technique to scrutinize how minute amounts of iron and silicate minerals interact at ultra-high pressures and temperatures, she is gaining insight into the biggest transformation Earth has ever undergone - the separation of its rocky mantle from its iron-rich core approximately 4.5 billion years ago. The technique, called high-pressure nanoscale X-ray computed tomography, is being developed at SLAC National Accelerator Laboratory. With it, Mao is getting unprecedented detail - in three-dimensional images - of changes in the texture and shape of molten iron and solid silicate minerals as they respond to the same intense pressures and temperatures found deep in the Earth.. Mao will present the results of the first few experiments with the technique at the annual meeting of the American ...
Bickle, M. ; Kampman, N. ; Chapman, H. ; Ballentine, C. ; Dubacq, B. ; Galy, A. ; Sirikitputtisak, T. ; Warr, O. ; Wigley, M. ; Zhou, Z., Chemical Geology
The rate of diffusive transport of Si and O in silicate melts is important not only in understanding kinetics of magmatic processes but also in studying the structure of silicate melts. The...
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A mildew resistant, water repellent, highly durable & breathable silicate. Potassium Silicate paints and stains chemically bond to all forms of masonry.
[124 Pages Report] Check for Discount on United States Potassium Silicate Market Report 2016 report by QYResearch Group. Notes: Sales, means the sales volume of Potassium Silicate Revenue,...
Zeolite, used to remove Cs from a contaminated water, would be solidified for the safety disposal. Recently, geopolymer is considered as a new binder
Olivine, any member of a group of common magnesium, iron silicate minerals. Olivines are an important rock-forming mineral group. Magnesium-rich olivines are abundant in low-silica mafic and ultramafic igneous rocks and are believed to be the most abundant constituent of the Earths upper mantle.
Early densifiers were generally made from silicates such as sodium silicate. They performed the basic task of densifying the concrete, but they were problematic and had a number of drawbacks. Applying these traditional densifiers was time-consuming and labor-intensive. They had to be vigorously scrubbed into the surface for an hour, required overnight curing, and left a gelatin-like residue that had to be scrubbed off and disposed of before polishing could even begin. Inadequate removal of the densifier frequently resulted in an unsightly deposit known as whiting which was left on the concrete surface. Lithium silicates eliminated some of the time-consuming aspects of application and removal, but still presented a whiting hazard if excess material were applied, and it was difficult to judge how much was too much. Lithium silicates are also significantly more expensive than other silicates ...
TY - JOUR. T1 - Mineral trioxide aggregate inhibits osteoclastic bone resorption. AU - Hashiguchi, D.. AU - Fukushima, H.. AU - Yasuda, H.. AU - Masuda, W.. AU - Tomikawa, M.. AU - Morikawa, K.. AU - Maki, K.. AU - Jimi, E.. PY - 2011/7/1. Y1 - 2011/7/1. N2 - Mineral trioxide aggregate (MTA), a commonly used endodontic repair material, is useful for both basic and clinical research, and the effect of MTA on osteoblast differentiation has been well-defined. However, the effects of MTA on osteoclastic bone resorption are not fully understood. Hence, the aim of this study is to examine the effect of MTA solution in the regulation of osteoclast bone-resorbing activity using osteoclasts formed in co-cultures of primary osteoblasts and bone marrow cells. MTA solution dosedependently reduced the total area of pits formed by osteoclasts. The reduction of resorption induced by 20% MTA treatment was due to inhibition of osteoclastic bone-resorbing activity and had no effect on osteoclast number. A 20% MTA ...
The purpose of this in vitro study is to compare the antimicrobial effect and pH of two calcium silicate cements Mineral trioxide aggregate high plasticity (Angelus PR, Brazil) and iRoot BP Plus (BioCeramix Inc., Vancouver, BC, Canada) and new bioactive restorative resin composite restorative material (ACTIVA, MA, Pulpdent, USA) against aerobic bacteria, strictly anaerobic bacteria and a yeast by using an agar diffusion test. The materials were tested immediately after manipulation and were applied to the agar plates. Sodium hypochlorite (NaOCl) 5.25% was used as a positive control group. The dry filter paper acted as a negative control group for this study. The size of the inhibition zone for each material was measured after 12, 24 and 48 h. At the time of pH measurement; materials were prepared, crushed then dispersed in distilled water. The one-way Anova test revealed that iRoot BP Plus significantly showed superior antimicrobial efficacy compared to MTA-HP against the following species;
TY - JOUR. T1 - Exothermic chemical reactions can drive nonthermal crystallization of amorphous silicate grains. AU - Kaito, Chihiro. AU - Miyazaki, Yu. AU - Kumamoto, Akihito. AU - Kimura, Yuki. PY - 2007/1/1. Y1 - 2007/1/1. N2 - To explain how cometary silicates crystallize yet still preserve volatile interstellar ices in their parent comets, we experimentally demonstrate the possibility of chemical-reaction-driven crystallization, which is called non-thermal crystallization, using laboratory-synthesized amorphous Mg-bearing silicate grains. Analog silicate grains ∼50-100 nm in diameter covered with a carbonaceous layer consisting of amorphous carbon, CH 4, and other organics to a thickness of ∼10-30 nm were used as models. The analog silicate grains crystallized via the direct flow of surface reaction energy, which is produced by the graphitization of the carbonaceous layer due to oxidation at room temperature in air, into the silicates. The experimental results imply that amorphous ...
Chronic periapical lesions in necrotic teeth with open apex are difficult to manage. The situation becomes more complex if the tooth has a fracture line. This case report describes the management of a traumatised tooth that had already undergone unsuccessful endodontic treatment with a large periapical lesion and open apex along with a fracture line in the root. An attempt was made to save the tooth by using mineral trioxide aggregate (MTA) cement for orthograde filling, retrograde filling and also for sealing of the fracture line. Moreover, the bone defect was filled with autogenous bone harvested from the external oblique ridge. MTA, a bioactive tricalcium silicate cement, has been used in treating complex endodontic cases as it shows promising potential by inducing the biological mechanisms necessary for repair of involved teeth. A 1-year follow-up showed progressive healing as evident by radiographs and lack of any clinical signs and symptoms. ...
Introduction: The aim of this study was to evaluate the effect of mechanical and manual mixing as well as the effect of ultrasonic agitation during placement on the flexural strength and porosity of mineral trioxide aggregate (MTA). Methods: White ProRoot MTA and white MTA Angelus were used. One gram of each powder was mixed with a 0.34-g aliquot of distilled water. Specimens were mixed either by mechanical mixing of capsules for 30 seconds at 4500 rpm or by a saturation technique and application of a condensation pressure of 3.22 MPa for 1 minute. The mixed slurries of all materials were loaded into 2 × 2 × 25 mm molds for testing flexural strength and 3 × 4 mm molds for evaluation of porosity. Half of the specimens were placed in the stainless steel molds by using indirect ultrasonic activation. All specimens were incubated for 4 days. Micro-computed tomography was used to determine the porosity of each specimen, and a 3-point bending test was used to evaluate flexural strength. Tukey ...
AbstractThe aim of this pilot study was to evaluate the clinical efficacy of mineral trioxide aggregate (MTA) as an apexification material when used in non-vital immature permanent incisors in children. Fifteen children with a mean age of 11.7 years and 17 non-vital permanent incisors were ajudged s
We report on investigation the potential of a 7 wt% (8.35 × 1020 Tm3+/cm3) doped silicate fibers for high-gain fiber amplifiers. Such a high ion concentration significantly reduces the required fiber length of high-power 2 μm fiber laser systems and allows the high-repetition rate operation in 2 μm mode-locked fiber lasers. To evaluate the feasibility of extracting high gain-per-unit-length from this gain medium, we measure several key material properties of the silicate fiber, including the absorption/emission cross-sections, upper-state lifetime, fiber background loss, and photodarkening resistance. We show through numerical simulations that a signal gain-per-unit-length of 3.78 dB/cm at 1950 nm can be achieved in a watt-level core-pumped Tm3+-doped silicate fiber amplifier. In addition, an 18-dB 2013-nm amplifier is demonstrated in a 50-cm 7 wt% Tm3+-doped double-clad silicate fiber. Finally, we experimentally confirm that the reported silicate host exhibits no observable photodarkening.
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The purpose of this study was to demonstrate the long-term success that can be achieved by the use of Mineral Trioxide Aggregate (MTA) as a pulp capping agent, demonstrate the simplicity of the procedure, and overcome the commonly held objections of cost, difficult handling characteristics, and the need for two appointments to complete the procedure.;A single visit protocol was utilized in the completion of forty-eight pulp cap procedures with twenty-seven procedures available for recall. The MTA pulp cap was covered with glass ionomer liner and then restored with a bonded composite or amalgam. Teeth were evaluated for sensitivity to percussion, cold testing, and periapical radiograph at follow-up appointments. A success rate of over eighty-five percent was achieved in this study. MTA has been demonstrated to be the material of choice and gold-standard for pulp capping procedures. MTA is biocompatible, less cytotoxic than calcium hydroxide, provides a bioactive benefit and a bacteriostatic seal. The
The current study demonstrated that LSO detector technology, together with a 3D image-acquisition mode, permitted emission scans of 1 min/bed position in patients who weighed less than 59 kg (130 lb), without compromising lesion detectability when 4-min/bed position images were used as a reference standard. However, because 4 lesions were missed on 1-min/bed position scans, such short scan durations should not be used in patients with higher weights. Two-minute/bed position emission scans were sufficient to detect all lesions identified on 4-min/bed position images in the study population. As expected, image quality varied significantly among different scan durations.. Using a BGO PET scanner and 2D data acquisition, Dahlbom et al. (16) were the first to demonstrate that non-attenuation-corrected scan times could be reduced to 1-2 min/bed position without compromising image quality. However, this study did not systematically analyze the effect of short PET acquisition protocols on lesion ...
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Sodium silicate is one of the raw materials used in the synthetic production of silica gel Silica gel is an effective dessicant or drying agent Sodium silicate is a white powder that is readily soluble in water producing an alkaline solution It is one of a number of related compounds like sodium ortho silicate sodium pyro silicate etc.
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Temperature affects the properties of concrete through its effect on the hydration of cement and its associated microstructural development. This paper focuses on the modifications to C-S-H induced by isothermal curing between 5 and 60 degrees C. The results show that as the temperature increases (within the range studied) the C/S ratio of C-S-H changes only slightly, with a higher degree of polymerisation of silicate chains, but there is a significant decrease in its bound water content and an increase of apparent density of 25%. This increase seems to come from a different packing of C-S-H at the nanoscale. As a consequence of these changes, the microstructure of the cement paste is much coarser and porous, which explains the lower final strengths obtained by curing at elevated temperatures. (C) 2013 Elsevier Ltd. All rights reserved.. Keywords: Calcium silicate hydrate (C-S-H) (B) ; Temperature (A) ; Microstructure (B) ; SEM (B) ; BSE. ...
Lanthanum silicate oxyapatite (La9.33+xSi6O26+1.5x) is known to exhibit higher oxygen ionic conductivity than yttria-stabilized zirconia at temperatures below 700oC, making this material attractive for its potential use in intermediate-temperature fuel cells operated at 500~700 oC. Mineshige et. al. reported that the lanthanum content in oxyapatite phase is strongly related to its electrical conductivity, with the highest conductivity obtained when x=0.67 (La10Si6O27) [1]. It was further reported that La2SiO5 existed in addition to the oxyapatite phase even in the as-sintered sample. Another important aspect that can influence electrical conductivity is the phase stability of lanthanum apatite, which remains unclear. In this study, electrical conductivity measurements of lanthanum silicate apatite were conducted for over 100h and its phase stability was evaluated. Lanthanum silicate apatite with nominal composition of La10Si6O27 was made by conventional solid state reaction. The pellet was ...
The aim of this study was to prepare β-wollastonite using a green synthesis method (autoclaving technique) without organic solvents and to study its bioactivity. To prepare β-wollastonite, the precursor ratio of CaO:SiO2 was set at 55:45. This mixture was autoclaved for 8 h and later sintered at 950 °C for 2 h. The chemical composition of the precursors was studied using X-ray fluorescence (XRF), in which rice husk ash consists of 89.5 wt % of SiO2 in a cristobalite phase and calcined limestone contains 97.2 wt % of CaO. The X-ray diffraction (XRD) patterns after sintering showed that only β-wollastonite was detected as the single phase. To study its bioactivity and degradation properties, β-wollastonite samples were immersed in simulated body fluid (SBF) for various periods of time. Throughout the soaking period, the molar ratio of Ca/P obtained was in the range of 1.19 to 2.24, and the phase detected was amorphous calcium phosphate, which was confirmed by scanning electron microscope with energy
Capping of the exposed pulp is indicated for reversible pulp tissue injury after physical or mechanical trauma in developing or mature teeth.The response to direct pulp capping with materials such as MTA or NEC is the formation of dentin barrier, resulting from the recruitment and proliferation of undifferentiated cells.. Different materials can be used to induce dentinal bridge formation.MTA has been introduced as a proper material to induce dentinal bridge formation,with greater mean thickness of dentinal bridge and less inflammation compared to traditional materials like calcium hydroxide. Although biocompatible, MTA has a poor handling characteristic, delay setting time, off-white color, and it is almost expensive.The Novel Endodontic Cement (NEC) has been introduced to combine reasonable characteristics of MTA with appropriate chemical properties, setting time, color, and handling characteristics.. The extracellular matrix (ECM) of pulp comprises a variety of proteins and polysaccharides, ...
silver nitrate. This article describes a method for imparting antimicrobial properties to textile materials by impregnation using water solutions and gels based on L-cysteine and silver nitrate. The results of microbiological testing of the samples are presented.. Key words: antimicrobial textile materials, impregnation, L-cysteine, silver nitrate. V. S. Federyaeva, R. F. Vitkovskaya, J. Goralski, I. Kotsemba, S. V. Petrov. Catalytic oxidation of carbon oxide and methane over nickel oxide catalysts supported on basalt fibers. In this paper properties of oxide catalysts supported on novel basalt fiber supports are considered. Catalysts were prepared by impregnation of basalt fibers with 5 wt.% solution of nickel nitrate. In this paper we considered an influence of basalt fibers treatment with solution of hydrochloric acid on metal content of catalysts prepared, carbon oxide and methane conversion, activation energy and interaction in metal oxide - support system using temperature programmed ...
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AbstractDummy molecularly imprinted mesoporous silicates (MIMS-2) were made by co-condensation of tetraethyl orthosilicate (TEOS) with precursors of bi-functional mimic of 2-naphthol, 2,7-dihydroxynaphthalene, around triblock copolymer surfactant Pluronic (P123) micelles. The bi-functional template was linked to two functional monomers through thermally cleavable covalent bonds to generate imprint precursor. This provides the possibility of incorporating the target into the cross-linked mesoporous silicate matrix in the non-ionic surfactant templated sol-gel process. P123 was eluted by ethanol extraction and template molecules were removed by refluxing the materials in a mixture of dimethyl sulfoxide (DMSO) and water. MIMS-1 was prepared similarly except that 2-naphthol was used as template instead of 2,7-dihydroxynaphthalene. Solid phase extraction studies showed that MIMS-2 exhibited good retention and selectivity for 2-naphthol among its structural analogues. The mono-functional molecule 2-naphthol
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.. ...
Masoud Parirokh and Mahmoud Torabinejad. Introduction 284. Portland Cement (PC) 285. Chemical composition 285. Physical properties 286. Antibacterial activity 287. Sealing ability 288. Biocompatibility 288. Cell culture studies 288. Subcutaneous implantation 288. In vivo investigations 289. Clinical applications 289. Limitations 289. Angelus MTA 291. Chemical composition 291. Physical properties 292. Antibacterial activity 293. Sealing ability 293. Biocompatibility properties 293. Cell structure studies 293. Subcutaneous implantation 294. Intraosseous implantation 294. In vivo investigations 294. Clinical applications 295. Bioaggregate (BA) 295. Chemical composition 295. Physical properties 296. Antibacterial activity 296. Sealing ability 296. Biocompatibility 296. Cell culture studies 296. Biodentine (BD) 297. Chemical composition 297. Physical properties 297. Biocompatibility and clinical applications 297. iRoot 298. Chemical composition 298. Physical properties 298. Biocompatibility ...
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Good day, I am Professor Josette Camilleri, Associate Professor at the University of Malta. Today, we will be discussing tricalcium silicate-based endodontic cements. Tricalcium silicate-based endodontic cements can be based on Portland cement and they can also be based on tricalcium silicate. The presentation clinically, usually are cements which are presented as powder and liquid, they can be presented as pastes and putty, they can even come in sealer forms, and also as pulp-capping materials. The tricalcium silicate can be pure tricalcium silicates, which are manufactured in the labs by sintering, by sol-gel methods, or else they can be also the Portland type, which comes in sets but usually are bought from the construction industry. It is a very, very cheap material which can be used in dentistry and packaged in small packets at a higher price. The main interest with this material is that when the material is mixed with water, which is the main mixing liquid of this cement type, you form ...
Samples of marble from Chillagoe, North Queensland have been analyzed using scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS) and Raman spectroscopy. Chemical analyses provide evidence for the presence of minerals other than limestone and calcite in the marble, including silicate minerals. Some of these analyses correspond to silicate minerals. The Raman spectra of these crystals were obtained and the Raman spectrum corresponds to that of allanite from the Arizona State University data base (RRUFF) data base. The combination of SEM with EDS and Raman spectroscopy enables the characterization of the mineral allanite in the Chillagoe marble.
The main cause for concern about surface water acidification in the United States and elsewhere is the potential for detrimental biological affects. Typically, there is concern for biological impact if the pH is less than 6. At low pH values, aluminum may be present at concentrations that are toxic to biota, including sensitive life stages of fish and invertebrates. Aluminum is normally a harmless component of silicate minerals in rocks and soils. However, when silicate minerals come in contact with low-pH waters, aluminum is leached into the waters.. While much of the aluminum present in surface waters is organically-bound and relatively non-toxic, certain inorganic species are highly toxic. The best indicator of recovery from the acidification of lakes and streams would be a decrease in the concentrations of inorganic monomeric aluminum, the most toxic form. Decreases in total aluminum would also suggest recovery, although the actual magnitude of the improvement in chemical conditions for ...
Sodium silicate is the chemical name of (Na2O)x�SiO2. Visit BYJU�S to study the uses, physical and chemical properties, structure of Sodium silicate ((Na2O)x�SiO2) from the expert faculties.
Potassium water glass RK138 - potassium silicate alloy or potassium silicate solution, systematic chemical names of the product are silicic acid or potassium salt. The color of the product is iridescent with a gray shade or a clear liquid without smell. RK138 potassium water glass is characterized by many parameters such as molar concentration, molar ratio, density, sum of oxides and viscosity. These parameters determine the quality of the product and its applicability. Potassium water glass has a very wide range of applications in the chemical industry, processing and construction. Due to its good water solubility, it is used in the production of household chemicals, e.g. detergents, powders and washing up liquids. In the water treatment process, to clean it of heavy metals, to soften to get rid of compounds that cause scale deposits. Potassium water glass is also used for the preparation and impregnation of wood and fabrics to obtain a fireproof surface (wood impregnated with water glass does ...
1) There is a general agreement, that magnesium silicate perovskite (Pv) comprises around 80 vol% of the Earths lower-mantle, making it by volume the most abundant mineral in our planet, and and there is no doubt that Pv in the mantle contains Fe and Al. However, the exact concentrations are unknown, as well as the effect of pressure on physical properties of Pv at conditions of Earth lower mantle. In our study we investigate Pv with one of the less explored substitution Mg2+A+Si4+B→Fe3+A+Al3+B. Here we explore as a function of pressure and temperature the crystal structure of the material, the distribution of chemical elements between different crystallographic sites and the evolution the spin state of ferric iron, as one of crucial parameters determining electrical and radiative conductivity of the Earths lower mantle. We perform single-crystal x-ray diffraction on magnesium silicate perovskite with the composition Mg0.63Fe0.37Si0.63Al0.37O3 (MgFeAlPv) using a combination of in-situ ...
Aluminum Sodium Silicate containing medications, Aluminum Sodium Silicate indications and usages ATC and ICD codes, combinations with other active ingredients and trade names information from Drugs-about.com
A reaction at very high temperatures between sodium carbonate and silicon dioxide forms the compound sodium silicate. Commonly known as water glass, sodium silicate is typically available in an aqueous solution, but you can also find it in solid state.
Sodium silicate is an aqueous solution of sodium silicate, is a strong base, weak acid salt, showed a strong alkaline, the free base is 6% to 7%. The sodium silicate is able to penetrate the carton surface, corrosion contents, does not meet the packaging requirements of food hygiene, and foreign trade. In a humid environment, the sodium silicate absorbent deliquescence, loss of adhesion, carton paper softened and deliquescence efflorescence, affecting printed effect help cartons appearance. As we all know, the use of sodium silicate, as an adhesive material cartons is hygroscopic, toxic, endangering human health and ecological environment seriously affect the quality of packaging products and merchandise sales, our packaging solved cut key issues, the paper and packaging industry tilted the period of waiting for a new generation of adhesives speedy advent! Developed capitalist countries in the 1950s are out of the sodium silicate in 1984, China began to limit and prohibit the use of sodium ...
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Global Sodium Silicate market is estimated to reach $8.1 Billion by 2025; growing at a CAGR of 3.3% till 2025. Sodium silicate is booming in the market owing to its widespread applications. It is used in the wastewater treatment industry in the cleaning process called coagulation.
Sodium Silicate Market - Europe Industry Analysis, Size, Share, Growth, Trends and Forecast, 2014 - 2020. Europe Sodium Silicate Market to be Worth US$897.6 mn by 2020
BARIUM SILICATE (CAS 13255-26-0) Market Research Report 2017 aims at providing comprehensive data on barium silicate market globally and regionally
Tetra Ethyl Silicate (CAS 78-10-4) Market Research Report 2017 aims at providing comprehensive data on tetra ethyl silicate market globally and regionally
The mineralogy of basalt is characterized by a preponderance of calcic plagioclase feldspar and pyroxene. Olivine can also be a significant constituent. Accessory minerals present in relatively minor amounts include iron oxides and iron-titanium oxides, such as magnetite, ulvospinel, and ilmenite. Because of the presence of such oxide minerals, basalt can acquire strong magnetic signatures as it cools, and paleomagnetic studies have made extensive use of basalt. In tholeiitic basalt, pyroxene (augite and orthopyroxene or pigeonite) and calcium-rich plagioclase are common phenocryst minerals. Olivine may also be a phenocryst, and when present, may have rims of pigeonite. The groundmass contains interstitial quartz or tridymite or cristobalite. Olivine tholeiite has augite and orthopyroxene or pigeonite with abundant olivine, but olivine may have rims of pyroxene and is unlikely to be present in the groundmass. In high-alumina basalts, phenocrysts of feldspar commonly are bytownite in composition. ...
Principal Investigator:OGISO Bunnai, Project Period (FY):2003 - 2004, Research Category:Grant-in-Aid for Scientific Research (C), Section:一般, Research Field:Conservative dentistry
According to CRISM multispectral data, the exposures of light-toned materials ( on small hills and between darker dunes ) shows a strong iron-magnesium phyllosilicate signatures in this area. Phyllosilicates, or sheet silicates, are an important group of minerals that includes the micas, chlorite, serpentine, talc, and the clay minerals. The existence of clay minerals is especially interesting on Mars since we want to know under what conditions these minerals formed. Could it have been the presence of water? This image is a new one for HiRISE, since we have no previous observations of this area. With our cameras resolution and data from CRISM, we might be able to determine if these particular phyllosilicates are actually present here. Written by: HiRISE Science Team (audio by Tre Gibbs) (14 November 2012) More info and image formats at http://hirise.lpl.arizona.edu/ESP_028288_1720. Image: NASA/JPL/University of Arizona ...
Brown Diatom Algae are dependent upon silicates and high DOC (dissolved organic compounds) in the water and thrive in conditions where the minerals and Redox are out of balance. Brown diatom algae also out compete more desirable green algae in these conditions when light is poor for healthy photosynthesis due to lack adequate amounts of light in the proper PAR.. More about poor lighting: light in the proper PAR. With the above points in mind, I will again emphasize that Brown Diatoms MUST have silicates present to reproduce, although removal of all silicates is often not feasible. In many of the methods (outlined in the removal tips below), the aquarist can lower the available silicates such as by simply adding plants or encouraging green algae to grow which will out compete the Brown diatoms.. From the Aquarium Answers article; Aquarium Test Kits here are some silicate parameters ...
Pumice stones: A pumice stone is established when lava and water mixture. Its a light-yet-abrasive stone that tried to eliminate dry, dead skin. A pumice stone can too mich mash your calluses and seeds to decrease pain from friction. You can use this Pumice stone every day, but its beneficial to know how to properly … Read more. ...
Important members are the cyclic and single chain silicates {[SiO3]2−}n and the sheet-forming silicates {[SiO2.5]−}n. Silicates ... A silicate is a compound containing an anionic silicon compound. The great majority of the silicates are oxides, but ... Silicate compounds, including the minerals, consist of silicate anions whose charge is balanced by various cations. Myriad ... Instead, solutions of silicates are usually observed as mixtures of condensed and partially protonated silicate clusters. The ...
Silicates - Soapstone. CAS No: Varies. NOTE:. (1) Efficacy of Medical Tests has not been evaluated.. (2) NIOSH references ... Silicates - Soapstone. Editor(s). /Author(s). Specific Medical Test(s) or Examination(s). Reference(s). ...
Europeans are more likely to use cladding made of calcium silicate.[why?] High-performance calcium-silicate boards retain their ... Calcium silicate is used as an anticaking agent in food preparation, including table salt[6] and as an antacid. It is approved ... Calcium silicate, also known as slag, is produced when molten iron is made from iron ore, silicon dioxide and calcium carbonate ... Calcium silicate is the chemical compound Ca2SiO4, also known as calcium orthosilicate and is sometimes formulated as 2CaO·SiO2 ...
Approximately 25 percent of all known minerals and 40 percent of the most common ones are silicates; the igneous rocks that ... The fundamental unit in all silicate structures is the silicon-oxygen (SiO4)4- tetrahedron. It is composed of a central silicon ... The silicates, owing to their abundance on the Earth, constitute the most important mineral class. ... make up more than 90 percent of the Earths crust are composed of virtually all silicates. ...
With Island Silicates (also known as Sorosilicates), all of the corners of the silicon tetrahedra are linked to positively ... With Island Silicates (also known as Sorosilicates), all of the corners of the silicon tetrahedra are linked to positively ... Olivine is a typical island silicate. Moderately hard, and has no prominent cleavage (dont laugh, its a geological term ...
Silicates - Talc (without asbestos). Editor(s). /Author(s). Specific Medical Test(s) or Examination(s). Reference(s). ... Silicates - Talc (without asbestos). CAS No: 14807-96-6. NOTE:. (1) Efficacy of Medical Tests has not been evaluated.. (2) ...
... report has been added to ResearchAndMarkets.coms... ... 2. SILICATES AND ALKALI METAL SILICATES MARKET IN CHINA. 2.1. Overview of silicates market. 2.2. Producers of silicates and ... 5. SILICATES AND ALKALI METAL SILICATES CONSUMERS IN CHINESE MARKET. 5.1. Downstream markets of Alkali Metal Silicates in China ... 2.2.4. Producers of other types of metal silicates. 3. CHINAS FOREIGN TRADE IN SILICATES AND COMMERCIAL ALKALI METAL SILICATES ...
The structure and physical properties of hydrous silicate melts and the solubility of water in melts over most of the pressure ... We link this change in structure to our finding that the water-silicate system becomes increasingly ideal at high pressure: we ... The authors link this change in structure to the finding that the water-silicate system becomes increasingly ideal at high ... This change in structure is linked to the finding that the water-silicate system becomes increasingly ideal at high pressure, ...
... double island silicates, (c) cyclo-silicates, (d) inosilicates, (e) sheet silicates.. ... Inosilicates (Single Chain Silicates) If two of the oxygens are shared in a way to make long single chains of linked SiO4 ... We can thus write a general structural formula for the silicates as follows:. XmYn(ZpOq)Wr where X represents an 8 to 12 fold ... Cyclosilicates (Ring Silicates) If two of the oxygens are shared and the structure is arranged in a ring, such as that shown ...
The silicates make up about 95 percent of Earths crust and upper mantle, occurring as the major constituents of most igneous ... Silicate mineral, any of a group of silicon-oxygen compounds that are widely distributed throughout much of the solar system. ... silicate structural linkagesThe basic structural unit of all silicate minerals is the silicon tetrahedron in which one silicon ... mineral: Silicates. The silicates, owing to their abundance on Earth, constitute the most important mineral class. ...
Thermo-1200™ is a high temperature, water resistant Type I calcium silicate designed to inhibit water absorption. In the event ... Calcium Silicate When exceptional strength and durability are required along with low thermal conductivity, Industrial ... Super Calstik® is a modified, silicate-based glue and can be used for bonding and sealing joints in Super Firetemp® high- ... Type I calcium silicate insulation with XOX Corrosion Inhibitor® (Service Temp: up to 1200°F) ...
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A list of US medications equivalent to Aluminum Silicate, Synthetic is available on the Drugs.com website. ... Aluminum Silicate, Synthetic is a medicine available in a number of countries worldwide. ... Ingredient matches for Aluminum Silicate, Synthetic. Aluminium Silicate. Aluminum Silicate, Synthetic (JAN) is also known as ... Aluminum Silicate, Synthetic. Aluminum Silicate, Synthetic may be available in the countries listed below. ...
Silicate perovskite is either (Mg,Fe)SiO3 (the magnesium end-member is called bridgmanite) or CaSiO3 (calcium silicate) when ... Silicate perovskites are not stable at Earths surface, and mainly exist in the lower part of Earths mantle, between about 670 ... The existence of silicate perovskite in the mantle was first suggested in 1962, and both MgSiO3 and CaSiO3 had been synthesized ... Calcium silicate perovskite has been identified at Earths surface as inclusions in diamonds. The diamonds are formed under ...
Magnesium silicate definition, a white powder, 3MgSiO3⋅5H2O, with variable hydration, insoluble in water or alcohol, used as a ... any silicate containing magnesium, as enstatite, talc, or magnesium trisilicate.. Explore Dictionary.com*. Weather Words You ...
The invention relates to co-activated silicate based phosphors. The invention further relates to the method of preparing these ... Silicate-based yellow-green phosphors. 2007-12-25. Wang et al.. 7276183. Metal silicate-silica-based polymorphous phosphors and ... METAL SILICATE HALIDE PHOSPHORS AND LED LIGHTING DEVICES USING THE SAME. WO2008042740A1. 2008-04-10. METAL SILICATE HALIDE ... NOVEL SILICATE-BASED YELLOW-GREEN PHOSPHORS. WO2006104860A2. 2006-10-05. METAL SILICATE-SILICA-BASED POLYMORPHOUS PHOSPHORS AND ...
Water resistant and air-drying alkali metal silicate coatings contain a base of an alkali metal silicate solution having a high ... the suitable water-soluble alkali metal silicates include lithium silicate, potassium silicate, and sodium silicate. The alkali ... Water resistant and air-drying alkali metal silicate coatings contain a base of an alkali metal silicate solution having a high ... When dealing with solutions of sodium or potassium silicate, this ratio of solvated silica to alkali metal silicate in the ...
Non-silicate minerals constitute less than 10 percent of the Earths crust. Carbon is found in diamond and graphite form. The ... Non-silicate minerals are minerals that do not contain silicon or oxygen as a tetrahedral structure. They have extremely ... Other non-silicate mineral groups, categorized according to their anionic chemistry, are the carbonates, halides, sulfates, ... The major basic group of non-silicate minerals is called native elements; these elements have a chemical formula that consists ...
All rights reserved. The published material is being distributed without warranty of any kind, either expressed or implied. Neither ILO nor WHO nor the European Commission shall be responsible for the interpretation and use of the information contained in this material ...
Silicate-impregnated wood is nothing new; its been around for at least as long as Arizonas famed Petrified Forest. While ... Silicate-impregnated wood is nothing new; its been around for at least as long as Arizonas famed Petrified Forest. While ... Sodium silicate is just one of several dissolved mineral compounds used to petrify wood. Almost any dissolved mineral can ... When its water carrier evaporates away, sodium silicate (a mixture of sand and soda ash) leaves behind a fully bonded sheet of ...
Understanding Our Products - Silicate Solution Chemistry. Sodium and potassium silicates are composed of a mix of silicate ... Silicate Summary. Silicates in which the tetrahedra share three corners are called phyllosilicates or sheet silicates, because ... Ethyl Silicate (Site not responding. Last check: 2007-11-07). At concentrations of 3,000 ppm, ethyl silicate causes extreme and ... Silicate. Since pieces of the Moon have been directly sampled and found to be made of silicate minerals (minerals with silicon ...
Active Calcium Silicate Market: Global Industry Analysis, Trends, Market Size and Forecasts up to 2023 report... ... 3.5 Competitive Landscape in the global active calcium silicate market 4. Global Active Calcium Silicate Market by Application ... 5. Global Active Calcium Silicate Market by Regions 2017 - 2023 6. Companies Covered ... 3. Global Active Calcium Silicate Market Overview 3.1 Introduction. 3.2 Market Dynamics. 3.3 Porters Five Forces Analysis. 3.4 ...
Building product manufacturers of Calcium Silicate Manufactured Stone Masonry and their related csi 3-part specs, cad details, ... Manufacturers of Calcium Silicate Manufactured Stone Masonry. Browse companies that make Calcium Silicate Manufactured Stone ... CSI DIVISIONS > DIVISION 04 > 04 73 13 - Calcium Silicate Manufactured Stone Masonry ... specifications and other content relating to Calcium Silicate Manufactured Stone Masonry as well as other product information ...
Sodium Silicate) makes eggs last for several months. Water glass 50 dozen eggs with a 1 gallon bucket. Also use to seal ... Store in solution of liquid sodium silicate and water. (boiled water, and 11 to 1 ration of water to liquid sodium silicate) We ... Water Glass - liquid sodium silicate Water glass (liquid sodium silicate) allows for an old-fashioned way to make fresh eggs ... For use as an adhesive: This silicate material is an excellent adhesive when used full strength. It can be diluted with small ...
Commonly known as water glass, sodium silicate is typically available in an aqueous solution, but you can also find it in solid ... A reaction at very high temperatures between sodium carbonate and silicon dioxide forms the compound sodium silicate. ... The automotive industry uses a hydrated form of sodium silicate called pentahydrate sodium silicate, which melts down at 72C. ... Sodium silicate has a high solubility in water and maintains stability while in neutral or alkaline solutions. The more acidic ...
Chapter 7 Overview of crystalline silicate dust around stars. * Chapter 8 A correlations study of crystalline silicate features ... Crystalline silicates in circumstellar dust shells. Supervisors. L.B.F.M. Waters. T. de Jong. ... Chapter 2 Steps toward interstellar silicate mineralogy: IV. The crystalline revolution. * Chapter 3 The composition and nature ... Chapter 6 Low-temperature crystallization of silicate dust in circumstellar disks. * ...
Webmineral : Danas New Silicate Classification. The Wikibook Historical Geology has a page on the topic of: Silicate minerals ... Silicate minerals are rock-forming minerals made up of silicate groups. They are the largest and most important class of ... Tectosilicates, or "framework silicates," have a three-dimensional framework of silicate tetrahedra with SiO2 or a 1:2 ratio. ... In mineralogy, silicate minerals are classified into seven major groups according to the structure of their silicate anion:[4][ ...
Silicate minerals are rock-forming minerals made up of silicate groups. They are the largest and most important class of rock- ... Tectosilicates, or "framework silicates," have a three-dimensional framework of silicate tetrahedra with SiO2 or a 1:2 ratio. ... Phyllosilicates (from Greek φύλλον phyllon, leaf), or sheet silicates, form parallel sheets of silicate tetrahedra with Si2O5 ... Inosilicates (from Greek ἴς is [genitive: ἰνός inos], fibre), or chain silicates, have interlocking chains of silicate ...
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  • And the ball mill is widely made use of in powder-making production line including cement, new-type building material, silicate, refractory material, fertilizer, ore dressing of ferrous metal and non-ferrous metal, glass ceramics, and so on. (jumpxlaalsmeer.nl)
  • It is widely used in cement, silicate, new construction material, refractory material, ferrous metal and non-ferrous metal as well as ceramics. (dpsmakowpodhalanski.pl)
  • Ball mill is widely used for the dry type or wet type grinding of all kinds of ores and other grind-able materials in cement, silicate product, new building material, refractory, fertilizer, black and non-ferrous metals and glass ceramic industry. (njoy-uithof.nl)
  • The ball mill is a key equipment for grinding materials, widely used in powder-making production line such as cement, silicate sand, new-type building material, refractory material, fertilizer, ore dressing of ferrous metal and non-ferrous metal, glass ceramics, etc. (njoy-uithof.nl)
  • 2019-11-2 The ball mill is a key piece of equipment for grinding crushed materials, and it is widely used in production lines for powders such as cement, silicates, refractory material, fertilizer, glass ceramics, etc. as well as for ore dressing of both ferrous and non-ferrous metals. (njoy-uithof.nl)
  • Road Concrete Milling Machine Used To Grind Cement Silicate New Building Material Fertilizer. (miinbeck.ch)
  • Ghent Belgium Europe large silicate jaw crusher sell at a loss. (pmperformance.pl)
  • Cone crusher A crushing machine suitable for raw materials in the metallurgy, construction, road construction, chemical and silicate industries. (gueguedelalastra.es)
  • CS cone crusher is used in the industries of metallurgy, building material, road construction, chemical engineering silicate etc. (zemni-prace-berger.cz)
  • Email Team Eagle Request a Quote En Espa ol Share this page on Facebook Designed to process abrasive hard rock using the timetested overhead eccentric design Eagle Jaw Crushers Eagle 2036 Portable Jaw Crusher Eagle 3242 Portable Jaw Crusher Email us using the form below if you are interested in this or other used Eagle Crusher. (glslifts.in)
  • Onyx is a banded quartz of silicate mineral which has parallel bands, thanks to the growth of silica crystals. (modishstore.com)
  • Chemi Bags are double stitched nylon filter bags for use with any type of granular filter media such as Phosphate, Ammonia, Nitrate, Silicate removers or activated carbon. (aquariumsupplies.ca)
  • 4. Blue OEM Ethylene glycol based with OAT (Organic Acid Technology) based inhibitor system that is Silicate, Phosphate, Amine, Borate and Nitrite free. (lotuselancentral.com)
  • Ball mill is a type of grinding machine used for grinding different materials, such as cement, ceramics, silicates and rocks. (njoy-uithof.nl)
  • 4.Using high quality aluminum silicate insulation materials and double sealing structureensure the best heat preservationsealed performance. (auxcouleursdeneuvy.fr)
  • The mica group of sheet silicate (phyllosilicate) minerals includes several closely related materials having nearly perfect basal cleavage. (havaji.cz)
  • YK Series Vibrating Screen Is Used For The Crushing Of Raw Materials In Metallurgy, Architecture, Road Construction, Chemistry, And Silicate Industry Which Can Grind The Midhard Ore And Rock This Series Vibrating Screen Has A Feature Of Large Crushing. (heilung-deiner-seele.de)
  • Asbestos ore is a general name that applies to several types of fibrous silicate minerals. (kulinarnysos.pl)
  • Sun Silicates is the only South African company that supply a complete range of Perlite and Vermiculite products. (vulture-creek.co.za)

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