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Merck
CN

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:
14808-60-7
Molecular Weight:
60.08
NACRES:
SB.52
PubChem Substance ID:
57648586
UNSPSC Code:
12352300
EC Number:
238-878-4
MDL number:
MFCD00011232

Key Documents

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Product Name

Silicon dioxide, washed and calcined, analytical reagent

InChI key

VYPSYNLAJGMNEJ-UHFFFAOYSA-N

InChI

1S/O2Si/c1-3-2

SMILES string

O=[Si]=O

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

Quality Level

100

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Application

Silicon dioxide may be used to produce silicon by electrochemical reduction in the presence of calcium chloride (CaCl2) electrolyte.

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.

Storage Class

13 - Non Combustible Solids

wgk

nwg

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

dust mask type N95 (US), Eyeshields, Gloves

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Certificates of Analysis (COA)

Lot/Batch Number
STBG6104V
STBG4483V
SZBE1420V
SZBE1420
SZBC0680V

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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)
Surface modification of silicon dioxide, silicon nitride and titanium oxynitride for lactate dehydrogenase immobilization.
Saengdee P, et al.
Biosensors And Bioelectronics, 67, 134-138 (2015)
Eagleson M.
Concise Encyclopedia Chemistry, 983-984 (1994)
Study of silicon-silicon dioxide structure by electron spin resonance I.
Nishi Y.
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.
Nature Materials, 2(6), 397-401 (2003)
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