S5505
Silica, fumed
powder, 0.2-0.3 μm avg. part. size (aggregate)
Synonym(s):
Silica, Silicic anhydride, Silicon dioxide, Silicon dioxide amorphous
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About This Item
Linear Formula:
SiO2
CAS Number:
Molecular Weight:
60.08
NACRES:
NA.22
PubChem Substance ID:
UNSPSC Code:
12352103
MDL number:
form
powder
Quality Segment
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
Application
Fumed Silica (SiO2) has been used as a precursor to synthesize:
It can be also used in the preparation of:
- 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.
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Storage Class
11 - Combustible Solids
wgk
WGK 2
flash_point_f
Not applicable
flash_point_c
Not applicable
ppe
Eyeshields, Gloves, type N95 (US)
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