637246
Silicon dioxide
nanopowder (spherical, porous), 5-20 nm particle size (TEM), 99.5% trace metals basis
Synonym(s):
Silica, Nanosilica, Silicon dioxide
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About This Item
Linear Formula:
SiO2
CAS Number:
Molecular Weight:
60.08
NACRES:
NA.23
PubChem Substance ID:
UNSPSC Code:
12352302
EC Number:
231-545-4
MDL number:
assay
99.5% trace metals basis
form
nanopowder (spherical, porous)
reaction suitability
core: silicon
surface area
590-690 m2/g , TEM
particle size
5-20 nm (TEM)
bp
2230 °C (lit.)
mp
>1600 °C (lit.)
density
2.2-2.6 g/mL at 25 °C
bulk density
0.068 g/mL
SMILES string
O=[Si]=O
InChI
1S/O2Si/c1-3-2
InChI key
VYPSYNLAJGMNEJ-UHFFFAOYSA-N
General description
Porous silicon dioxide nanopowder, also known as silica or silicon dioxide is a fine, white powder with a porous structure. It is composed of nanoscopic particles of silicon dioxide, 5-20 nm in size and has a high surface area due to its porous structure.
Application
Silicon dioxide finds applications in various fields, ranging from catalysis to composite synthesis. Some major studies are listed here:
- Pickering emulsion polymerization using a silicon dioxide nanoparticle stabilizer to form molecularly imprinted polymers for steroid recognition.
- Mesoporous silica is used as a catalyst support in the preparation of multiwalled carbon nanotubes (MWCNTs).
- It is used as a ring opening of tetrahydrofuran-dimethanol to 1,2,6-hexanetriol.
- It maybe used to prepare silica/brominated poly(phenylene oxide) nanocomposites membranes for CO2 seperations.
- The composite scaffold of chitosan/chondroitin sulfate/nano-SiO2 was fabricated by lyophilization.
- Nanocomposites preparation of silica, single-wall carbon nanotubes, and graphite nanoplatelets in an epoxy matrix have been reported.6
- Dielectric spectroscopy study of the polystyrene/nanosilica model system has been studied.
- PMMA SiO2 nanocomposites were reported to be synthesized.
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Storage Class
11 - Combustible Solids
wgk
nwg
flash_point_f
Not applicable
flash_point_c
Not applicable
ppe
dust mask type N95 (US), Eyeshields, Gloves
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Related Content
This thematic issue focuses on the emerging applications of nanomaterials. Nanomaterials are defined as substances with at least one dimension smaller than 100 nm.
Effect of surface modification of silica nanoparticles on toxicity and cellular uptake by human peripheral blood lymphocytes in vitro
Lankoff A, et al.
Nanotoxicology, 7(3), 235-250 (2011)
Catalyst studies on the ring opening of tetrahydrofuran-dimethanol to 1, 2, 6-hexanetriol
Buntara T, et al.
Catalysis Today, 210, 106-116 (2013)
Laura Rubio et al.
Particle and fibre toxicology, 16(1), 40-40 (2019-10-31)
Amorphous silica nanoparticles (SiO2 NPs) have been regarded as relatively benign nanomaterials, however, this widely held opinion has been questioned in recent years by several reports on in vitro and in vivo toxicity. Surface chemistry, more specifically the surface silanol