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S5505

Sigma-Aldrich

Silica, fumed

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

Sinónimos:

Silica, Silicic anhydride, Silicon dioxide, Silicon dioxide amorphous

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About This Item

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
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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

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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.[1]
  • Silicon carbide (SiC) nanoparticles by sol-gel method.[2]
  • Calcium silicate hydrate (C-S-H) by treating with CaO and water via hydrothermal reaction.[3]
  • Si/PtO2 catalyst for the selective conversion of cinnamaldehyde to cinnamic acid by aerobic oxidation.[4]


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.[5]
  • HClO4-SiO2 heterogeneous catalyst used in the synthesis of tetrasubstituted imidazoles.[6]

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.

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)

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Certificados de análisis (COA)

Lot/Batch Number
0000406833
0000405226
0000405227
0000396312
0000396311

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D2622HMSUC

Sulfur in heavy mineral oil, ASTM D2622

Sílice mesoporous, 2 μm particle size, pore size ~2 nm

Sigma-Aldrich

806587

Sílice

Synthesis of nano-structured 3C-SiC by carbothermal reduction of silicon bearing gel and carbon soot
Sharma M, et al.
Materials Letters, 65(14), 2161-2164 (2011)
Effect of C/S ratio on morphology and structure of hydrothermally synthesized calcium silicate hydrate
He Y, et al.
Journal of Wuhan University of Technology-Materials Science Edition, 26(4), 770-773 (2011)
Silica sulfuric acid: an efficient and reusable catalyst for the one-pot synthesis of 3, 4-dihydropyrimidin-2 (1H)-ones
Salehi P, et al.
Tetrahedron Letters, 44(14), 2889-2891 (2003)
Platinum catalysed aerobic selective oxidation of cinnamaldehyde to cinnamic acid
Durndell LJ, et al.
Catalysis Today, 333(4), 161-168 (2019)
Organosilane modified silica/polydimethylsiloxane mixed matrix membranes for enhanced propylene/nitrogen separation
Beltran AB, et al.
Applied Surface Science, 258(1), 337-345 (2011)
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Questions

1–3 of 3 Questions  

  1. How is shipping temperature determined? And how is it related to the product storage temperature?

    1 answer

    1. Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf

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  2. How can I determine the shelf life / expiration / retest date of this product?

    1 answer

    1. If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
      For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
      For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
      For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/449/386/product-dating-information-mk.pdf

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  3. is this hydrophobic

    1 answer

    1. This product is hydrophilic. Please see the data sheet for more information: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/product/documents/246/034/s5505pis.pdf

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