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Merck
CN

18649

Silicon dioxide

acid washed

Synonym(s):

Cristobalite, Quartz, Sand, Silica

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About This Item

Linear Formula:
SiO2
CAS Number:
60676-86-0
Molecular Weight:
60.08
NACRES:
SB.52
PubChem Substance ID:
57647755
UNSPSC Code:
12352303
MDL number:
MFCD00011232

Key Documents

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InChI

1S/O2Si/c1-3-2

SMILES string

O=[Si]=O

InChI key

VYPSYNLAJGMNEJ-UHFFFAOYSA-N

form

solid

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.)

Quality Level

100

matrix

Silicon dioxide base material

mp

1610 °C (lit.)

density

2.6 g/mL at 25 °C (lit.)

anion traces

chloride (Cl-): ≤100 mg/kg

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Application

Silicon dioxide may be used to produce silicon by electrochemical reduction in the presence of calcium chloride (CaCl2) electrolyte. It may also be used to prepare FeCl3/SiO2, a supported reagent for the oxidative coupling reactions.

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

11 - Combustible Solids

wgk

nwg

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Gloves, type N95 (US)

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Certificates of Analysis (COA)

Lot/Batch Number
SDBB5544
SDBB3684
SDBB2241
STBK6228
STBK5003

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Iron trichloride/silicon dioxide reacts as oxidant or Lewis acid with phenol ethers.
Jempty TC, et al.
The Journal of Organic Chemistry, 46(22), 4545-4551 (1981)
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)
Electronic structure of silicon dioxide (a review).
Nekrashevich SS and Gritsenko VA.
Physics of the Solid State, 56(2), 207-222 (2014)
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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