silicon dioxide

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Related to Amorphous silica: diatomaceous earth, Crystalline silica

silicon dioxide:

see silicasilica
or silicon dioxide,
chemical compound, SiO2. It is insoluble in water, slightly soluble in alkalies, and soluble in dilute hydrofluoric acid. Pure silica is colorless to white.
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silicon dioxide

[′sil·ə·kən dī′äk‚sīd]
(inorganic chemistry)
SiO2 Colorless, transparent crystals, soluble in molten alkalies and hydrofluoric acid; melts at 1710°C; used to make glass, ceramic products, abrasives, foundry molds, and concrete.

silica, silicon dioxide

A white or colorless substance, nearly insoluble in water and in all acids except hydrofluoric; extremely hard; fuses to a colorless amorphous glass.

silicon dioxide

(SiO2) A hard, glassy mineral found in materials such as rock, quartz, sand and opal. In metal oxide semiconductor (MOS) chip fabrication, silicon dioxide is used to create the insulation layer between the metal gates of the top layer and the silicon elements below. See silica gel.
References in periodicals archive ?
This can be achieved by transforming amorphous silica binder to crystalline form before the shell cools to room temperature.
Catalysts prepared with mesostructured SBA-15 supports exhibited better catalytic performance than those supported on amorphous silica and silica-alumina.
PPG is a worldwide leader in the precipitated amorphous silica business.
For comparison purposes, compounds with amorphous silica (Ultrasil VN2 GR from Degussa) were also made.
Tire with silica-reinforced tread comprised of trans 1,4-polybutadiene, solution; SBR polyisoprene and defined amounts of carbon black and amorphous silica
Keywords: Silanizing polychloroprene with amorphous silica
These products combine low or high viscosity liquids, resins or liquid polymers with hydrated amorphous silica.
Composition of cyclic amine-initiated elastomers and amorphous silica and process for the production thereof U.
We attempted the separation of the amorphous silica from the carbon black surface of the SCC by the test method described previously.
After several years of use, however, it was found that volatile components of these formulations oxidized to amorphous silica in the exhaust stream.
As said before, useful modifications involved partial substitution of the carbon black by a high specific surface area amorphous silica in an all natural rubber elastomer system (Silica B, table 1).
The study presented here focuses on extracting Si from amorphous silica in soils ([Si.