637246

Silicon dioxide

nanopowder (spherical, porous), 5-20 nm particle size (TEM), 99.5% trace metals basis

• Synonym(s): Silica, Nanosilica, Silicon dioxide
• Linear Formula: SiO₂
• CAS Number: 7631-86-9
• Molecular Weight: 60.08
• EC Number: 231-545-4
• MDL number: MFCD00011232
• UNSPSC Code: 12352302
• PubChem Substance ID: 24882840
• NACRES: NA.23

Properties

• Quality Level: 100
• Assay: 99.5% trace metals basis
• form: nanopowder (spherical, porous)
• 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

Description

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.

Safety Information

• Storage Class Code: 11 - Combustible Solids
• WGK: nwg
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable
• Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves