31623
Silicon dioxide
washed and calcined, analytical reagent
Synonym(s):
Sand, white quartz, Quartz, Silicon dioxide
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About This Item
Linear Formula:
SiO2
CAS Number:
Molecular Weight:
60.08
EC Number:
MDL number:
UNSPSC Code:
12352300
PubChem Substance ID:
NACRES:
SB.52
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form
granular
quality
washed and calcined, analytical reagent
impurities
≤0.2% Soluble in HCl
loss
≤0.1% loss on ignition
granulation
0.1-0.5 mm (min.70%)
anion traces
chloride (Cl-): ≤100 mg/kg
SMILES string
O=[Si]=O
InChI
1S/O2Si/c1-3-2
InChI key
VYPSYNLAJGMNEJ-UHFFFAOYSA-N
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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.
Application
Silicon dioxide may be used to produce silicon by electrochemical reduction in the presence of calcium chloride (CaCl2) electrolyte.
Storage Class Code
13 - Non Combustible Solids
WGK
nwg
Flash Point(F)
Not applicable
Flash Point(C)
Not applicable
Personal Protective Equipment
dust mask type N95 (US), Eyeshields, Gloves
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Study of silicon-silicon dioxide structure by electron spin resonance I.
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Japanese Journal of Applied Physics, 10(1), 52-52 (1971)
Pinpoint and bulk electrochemical reduction of insulating silicon dioxide to silicon.
Nohira T, et al.
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Surface modification of silicon dioxide, silicon nitride and titanium oxynitride for lactate dehydrogenase immobilization.
Saengdee P, et al.
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Electronic structure of silicon dioxide (a review).
Nekrashevich SS and Gritsenko VA.
Physics of the Solid State, 56(2), 207-222 (2014)
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