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18649

Sigma-Aldrich

Silicon dioxide

acid washed

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Synonym(s):
Cristobalite, Quartz, Sand, Silica
Linear Formula:
SiO2
CAS Number:
Molecular Weight:
60.08
MDL number:
PubChem Substance ID:
NACRES:
SB.52

form

solid

Quality Level

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

SMILES string

O=[Si]=O

InChI

1S/O2Si/c1-3-2

InChI key

VYPSYNLAJGMNEJ-UHFFFAOYSA-N

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1 of 4

This Item
8487885356342890
Silicon dioxide acid washed

18649

Silicon dioxide

Silicon dioxide purum p.a., acid purified, sand

84878

Silicon dioxide

Silicon dioxide granular, ≥99.9%

85356

Silicon dioxide

Silicon dioxide −325 mesh, 99.5% trace metals basis

342890

Silicon dioxide

mp

1610 °C (lit.)

mp

1610 °C (lit.)

mp

1610 °C (lit.)

mp

1610 °C (lit.)

impurities

≤0.01% in acid soluble iron (Fe), ≤0.5% soluble in HCl

impurities

-

impurities

-

impurities

-

quality

acid washed

quality

acid purified

quality

-

quality

-

density

2.6 g/mL at 25 °C (lit.)

density

2.6 g/mL at 25 °C (lit.)

density

2.6 g/mL at 25 °C (lit.)

density

2.6 g/mL at 25 °C (lit.)

loss

≤0.5% loss on ignition, 800 °C

loss

≤0.1% loss on ignition, 900 °C

loss

-

loss

-

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. It may also be used to prepare FeCl3/SiO2, a supported reagent for the oxidative coupling reactions.

Storage Class

11 - Combustible Solids

wgk_germany

nwg

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Gloves, type N95 (US)


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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)
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)
Eagleson M.
Concise Encyclopedia Chemistry, 983-984 (1994)
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)

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