S5130

Silica, fumed

powder

• Synonym(s): Silica, Silicic anhydride, Silicon dioxide, Silicon dioxide amorphous
• Linear Formula: SiO₂
• CAS Number: 112945-52-5
• Molecular Weight: 60.08
• MDL number: MFCD00011232
• UNSPSC Code: 12352300
• PubChem Substance ID: 57654622
• NACRES: NA.23

Properties

• form: powder
• surface area: 395 m²/g (±25 m²/g)
• refractive index: n20/D 1.46 (lit.)
• 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

General description

Fumed silica may be synthesized by high temperature hydrolysis of SiCl₄ in O₂(N₂)/H₂ flame. It is amorphous in nature and possesses very high specific area. The micro droplets of amorphous silica fuse into a branch and form a chain like agglomerate.

Application

Fumed silica is used to deplete lipids and hormones in Taqman assays of human hepatoma cells HuH-7 and human liver cell line HepG2. Preparation of epoxidized natural rubber/fumed silica composites have been reported. Interaction of Gemini surfactant C12-s-C122Br with aqueous suspension of fumed silica has been studied. Fumed silica based nanocomposites reinforced with organo clay may be prepared. TiO₂/fumed silica porous ceramic material was used to prepare photocatalytic materials.

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 Information

• 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