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18649 Supelco

Silicon dioxide

acid washed

Synonym: Cristobalite, Quartz, Sand, Silica

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Properties

Related Categories Adsorbents, Filter Aids and Drying Agents, Essential Chemicals, Other Drying Agents, Research Essentials
InChI Key   VYPSYNLAJGMNEJ-UHFFFAOYSA-N
quality   acid washed
impurities   ≤0.01% in acid soluble iron (Fe)
  ≤0.5% soluble in HCl
loss   ≤0.5% loss on ignition, 800 °C
refractive index   n20/D 1.544(lit.)
mp   1610 °C(lit.)
density   2.6 g/mL at 25 °C(lit.)
anion traces   chloride (Cl-): ≤100 mg/kg

Description

General description

Silicon dioxide (SiO2) exists in three crystalline forms, namely quartz, tridymite and cristobalite. It reacts with hydrofluoric acid to form silicon tetrafluoride (SiF4) and water. Silicates are formed on reacting SiO2 with alkali melts. SiO2 is the main component in glass, brick and concrete and also forms the insulator in silicon devices. The alteration of the surface of SiO2 with (3-aminopropyl)triethoxysilane (APTES) for binding lactate dehydrogenase (LDH) to form an amino layer has been reported. The silicon-silicon dioxide structure has been investigated at liquid nitrogen temperature by electron spin resonance spectra.

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Safety & Documentation

Safety Information

RIDADR 
NONH for all modes of transport
WGK Germany 
nwg
Protocols & Articles
Peer-Reviewed Papers
15

References

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