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S5505

Sigma-Aldrich

Silica, fumed

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

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

form

powder

Quality Level

refractive index

n20/D 1.46 (lit.)

avg. part. size

0.2-0.3 μm (aggregate)

surface area

200 m2/g±25 m2/g

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.

Packaging

500 g in poly drum
100 g in poly bottle

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

Certificate of Analysis

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Certificate of Origin

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Product Information Sheet

More Documents

Quotes and Ordering

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