S5505

Silica, fumed

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

• Synonim(y): Silica, Silicic anhydride, Silicon dioxide, Silicon dioxide amorphous
• Wzór liniowy: SiO₂
• Numer CAS: 112945-52-5
• Masa cząsteczkowa: 60.08
• Numer MDL: MFCD00011232
• Kod UNSPSC: 12352103
• Identyfikator substancji w PubChem: 24899656
• NACRES: NA.22

Właściwości

• Postać: powder
• Poziom jakości: 200
• powierzchnia: 200 m²/g (±25 m²/g)
• współczynnik refrakcji: n20/D 1.46 (lit.)
• śr. rozm. cząst.: 0.2-0.3 μm (aggregate)
• gęstość: 2.3 lb/cu.ft at 25 °C (bulk density)(lit.)
• ciąg SMILES: O=[Si]=O
• InChI: 1S/O2Si/c1-3-2
• Klucz InChI: VYPSYNLAJGMNEJ-UHFFFAOYSA-N

Opis

Zastosowanie

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.

Cechy i korzyści

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

Inne uwagi

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

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Informacja o środkach bezpieczeństwa

• Kod klasy składowania: 11 - Combustible Solids
• Klasa zagrożenia wodnego (WGK): WGK 2
• Temperatura zapłonu (°F): Not applicable
• Temperatura zapłonu (°C): Not applicable
• Środki ochrony indywidualnej: Eyeshields, Gloves, type N95 (US)