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S5505 Sigma-Aldrich

Silica, fumed

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

Synonym: Silica, Silicic anhydride, Silicon dioxide amorphous, Silicon dioxide

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Properties

Related Categories Chemical Synthesis, Materials Science, Metal and Ceramic Science, Oxides, Reagents,
Quality Level   200
form   powder
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

Description

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

100 g in poly bottle

500 g in poly drum

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.

Safety & Documentation

Safety Information

Personal Protective Equipment 
RIDADR 
NONH for all modes of transport
WGK Germany 
WGK 2
RTECS 
VV7310000
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable

Documents

Certificate of Analysis (COA)

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Certificate of Origin (COO)

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Protocols & Articles
Peer-Reviewed Papers
15

References

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