silicon dioxide


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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 ?
According to MRFR analysis, the global silicon dioxide market has been segmented based on form, purity, application, end-use industry and region.
After the optimization process, the optimal ingredients composition that fulfilled the requirement for yield of powder, moisture content, encapsulation efficiency of total phenolic and flavonoid content, and dissolution rate were found to be the leaf extract with 90.18%, vitamin D3 with 2.00 %, silicon dioxide with 1.25%, and maltodextrine with 6.58%.
From the abovementioned, the hybrid membrane of carboxymethyl chitosan and silicon dioxide was synthesized in this work to enhance the adsorption potential of Cr(VI).
The optical constants of silicon dioxide are mainly based on the data collected in Palik's handbook [17].
Silicon dioxide thin films with uniform thickness are developed on silicon samples using anodic oxidation process at room temperature.
The general LPD reaction, hydrofluorosilicic acid supersaturated with silicon dioxide is used to make the LPD solution.
They coated a thin layer of silver onto the photoresist, with a layer of silicon dioxide glass on top of that.
Among the topics are enhancing the performance of TiSi2-coated silicon nanocrystal memory devices, novel magneto-resistive structures using self-assembly and nanowires on silicon, charge storage properties of a nickel silicide nanocrystal layer embedded in silicon dioxide, key technologies for an iron RAM backend module, a simulation model of resistive switching in electrochemical metalization memory cells, field-induced crystal nucleation in chalcogenide phase change memory, and crystallization characteristics of Ge-Sb phase change materials.
Rochow, whose interest in silicon chemistry had been triggered by building a quartz crystal radio (quartz is silicon dioxide) as a child, worked out a way to make silicones using essentially sand and methane as raw materials.
The JRC is developing a new range of solid-state sensors, based on nanocrystalline silicon dioxide films, which are more stable and more efficient than traditional monitoring systems.
The rotor is made from a material called silicon dioxide.
The bauxite residue, consisting mainly of iron oxide and silicon dioxide, is disposed of in the sea based on the domestic law.