S5505

Silica, fumed

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

• Sinónimos: Silica, Silicic anhydride, Silicon dioxide, Silicon dioxide amorphous
• Fórmula lineal: SiO₂
• Número de CAS: 112945-52-5
• Peso molecular: 60.08
• Número MDL: MFCD00011232
• Código UNSPSC: 12352103
• ID de la sustancia en PubChem: 24899656
• NACRES: NA.22

Propiedades

• formulario: powder
• superficie: 200 m²/g (±25 m²/g)
• índice de refracción: n20/D 1.46 (lit.)
• tam. prom. pieza: 0.2-0.3 μm (aggregate)
• densidad: 2.3 lb/cu.ft at 25 °C (bulk density)(lit.)
• cadena SMILES: O=[Si]=O
• InChI: 1S/O2Si/c1-3-2
• Clave InChI: VYPSYNLAJGMNEJ-UHFFFAOYSA-N

Descripción

Aplicación

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.

Características y beneficios

Has interesting thickening and thixotropic properties, and an enormous external surface area.

Otras notas

Particle sizes are for primary particles, which form branched, chain-like aggregates a few tenths of a micron long.

Información de seguridad

• Código de clase de almacenamiento: 11 - Combustible Solids
• Clase de riesgo para el agua (WGK): WGK 2
• Punto de inflamabilidad (°F): Not applicable
• Punto de inflamabilidad (°C): Not applicable
• Equipo de protección personal: Eyeshields, Gloves, type N95 (US)