S5505

Silica, fumed

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

• 동의어(들): Silica, Silicic anhydride, Silicon dioxide, Silicon dioxide amorphous
• Linear Formula: SiO₂
• CAS Number: 112945-52-5
• Molecular Weight: 60.08
• MDL number: MFCD00011232
• UNSPSC 코드: 12352103
• PubChem Substance ID: 24899656
• NACRES: NA.22

속성

• 형태: powder
• Quality Level: 200
• 표면적: 200 m²/g (±25 m²/g)
• refractive index: n20/D 1.46 (lit.)
• 평균 부품 크기: 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

설명

애플리케이션

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.

특징 및 장점

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

기타 정보

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

안전성 정보

• Storage Class Code: 11 - Combustible Solids
• WGK: WGK 2
• Flash Point (°F): Not applicable
• Flash Point (°C): Not applicable
• 개인 보호 장비: Eyeshields, Gloves, type N95 (US)