Chemicals

Silicon Dioxide

23-Hydroxybetulinic Acid-Product_Structure
Molecule Structure Image

Description

 

Silicon dioxide (Silica) is an oxide of silicon. It is most commonly found in nature as sand or quartz, as well as in the cell walls of diatoms. It is used primarily in the production of glass for windows, drinking glasses, beverage bottles, and many other uses. The majority of optical fibers for telecommunications are also made from silica. It is a primary raw material for many whiteware ceramics such as earthenware, stoneware, porcelain, as well as industrial Portland cement. It is a common additive in the production of foods, where it is used primarily as a flow agent in powdered foods, or to absorb water in hygroscopic applications. It is the primary component of diatomaceous earth which has many uses ranging from filtration to insect control. It is also the primary component of rice husk ash which is used, for example, in filtration and cement manufacturing. Thin films of silica grown on silicon wafers via thermal oxidation methods can be quite beneficial in microelectronics, where they act as electric insulators with high chemical stability. In electrical applications, it can protect the silicon, store charge, block current, and act as a controlled pathway to limit current flow. A silica-based aerogel was used in the Stardust spacecraft to collect extraterrestrial particles. It is also used in the extraction of DNA and RNA due to its ability to bind to the nucleic acids under the presence of chaotropes. As hydrophobic silica it is used as a defoamer component. In hydrated form, it is used in toothpaste as a hard abrasive to remove tooth plaque. In cosmetics, it is useful for its light-diffusing properties and natural absorbency. Colloidal silica is used as a wine and juice fining agent. In pharmaceutical products, silica aids powder flow when tablets are formed.

Chemical Properties

Appearance White Crystals or Powder
Boiling Point 2230 °C
CAS Number 7631-86-9
ChEBI 30563
Density 2.648 g/cm3
EINECS Number 231-545-4
HS Code 28112200
IUPAC Name Silicon Dioxide
InChI S/O2Si/c1-3-2
InChIKey VYPSYNLAJGMNEJ-UHFFFAOYSA-N
Melting Point 1600-1725 °C
Molar Mass 60.0843 g/mol
Molecular Formula SiO2
NFPA 704 H-1,F-0,R-0,C-NA
RTECS Number VV7310000
Refractive n20/D 1.46
Related Compounds Silicon Monoxide;Silicon Sulfide
Solubility 0.079 g/l
Synonyms Quartz;Silica;Silicic Oxide;Silicon(IV) Oxide
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