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S5505

Sigma-Aldrich

Silica, fumed

powder, 0.2-0.3 μm avg. part. size (aggregate)

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Synonym(s):
Silica, Silicic anhydride, Silicon dioxide, Silicon dioxide amorphous
Linear Formula:
SiO2
CAS Number:
112945-52-5
Molecular Weight:
60.08
MDL number:
MFCD00011232
PubChem Substance ID:
24899656
NACRES:
NA.22

form

powder

Quality Level

200

surface area

200 m2/g (±25 m2/g)

refractive index

n20/D 1.46 (lit.)

avg. part. size

0.2-0.3 μm (aggregate)

density

2.3 lb/cu.ft at 25 °C (bulk density)(lit.)

SMILES string

O=[Si]=O

InChI

1S/O2Si/c1-3-2

InChI key

VYPSYNLAJGMNEJ-UHFFFAOYSA-N

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Application

Fumed Silica (SiO2) has been used as a precursor to synthesize:
  • Chlorosilanes via silanization, which are used to prepare silica/polydimethylsiloxane membranes to study permeation performance.
  • Silicon carbide (SiC) nanoparticles by sol-gel method.
  • Calcium silicate hydrate (C-S-H) by treating with CaO and water via hydrothermal reaction.
  • Si/PtO2 catalyst for the selective conversion of cinnamaldehyde to cinnamic acid by aerobic oxidation.


It can be also used in the preparation of:
  • Silica sulfuric acid catalyst used in the synthesis of 3,4-dihydropyrimidin-2(1H)-ones via one-pot three-component Biginelli reaction.
  • HClO4-SiO2 heterogeneous catalyst used in the synthesis of tetrasubstituted imidazoles.

Features and Benefits

Has interesting thickening and thixotropic properties, and an enormous external surface area.

Other Notes

Particle sizes are for primary particles, which form branched, chain-like aggregates a few tenths of a micron long.

Storage Class Code

11 - Combustible Solids

WGK

WGK 2

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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Synthesis of nano-structured 3C-SiC by carbothermal reduction of silicon bearing gel and carbon soot
Sharma M, et al.
Materials Letters, 65(14), 2161-2164 (2011)
Effect of C/S ratio on morphology and structure of hydrothermally synthesized calcium silicate hydrate
He Y, et al.
Journal of Wuhan University of Technology-Materials Science Edition, 26(4), 770-773 (2011)
Platinum catalysed aerobic selective oxidation of cinnamaldehyde to cinnamic acid
Durndell LJ, et al.
Catalysis Today, 333(4), 161-168 (2019)
Organosilane modified silica/polydimethylsiloxane mixed matrix membranes for enhanced propylene/nitrogen separation
Beltran AB, et al.
Applied Surface Science, 258(1), 337-345 (2011)
Highly efficient, one-pot, solvent-free synthesis of tetrasubstituted imidazoles using HClO4-SiO2 as novel heterogeneous catalyst
Kantevari S, et al.
J. Mol. Catal. A: Chem., 266(1-2), 109-113 (2007)
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