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Merck

S5505

Silica, fumed

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

Synonym(s):

Silica, Silicic anhydride, Silicon dioxide, Silicon dioxide amorphous

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About This Item

Linear Formula:
SiO2
CAS Number:
112945-52-5
Molecular Weight:
60.08
NACRES:
NA.22
PubChem Substance ID:
24899656
UNSPSC Code:
12352103
MDL number:
MFCD00011232

Key Documents

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form

powder

Quality Level

200

surface area

200 m2/g (±25 m2/g)

refractive index

n20/D 1.46 (lit.)

avg. part. size

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

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Application

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.

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.

Storage Class

11 - Combustible Solids

wgk

WGK 2

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Gloves, type N95 (US)

Regulatory Listings

Regulatory Listings are mainly provided for chemical products. Only limited information can be provided here for non-chemical products. No entry means none of the components are listed. It is the user’s obligation to ensure the safe and legal use of the product.

S5505-VAR: + S5505-BULK: + S5505-500G:4548173949291 + S5505-25G: + S5505-100G:4548173949284

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Certificates of Analysis (COA)

Lot/Batch Number
098K0049
066K0110
057K0063
121H0036
102K0129

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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)
Platinum catalysed aerobic selective oxidation of cinnamaldehyde to cinnamic acid
Durndell LJ, et al.
Catalysis Today, 333(4), 161-168 (2019)
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)
Organosilane modified silica/polydimethylsiloxane mixed matrix membranes for enhanced propylene/nitrogen separation
Beltran AB, et al.
Applied Surface Science, 258(1), 337-345 (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)
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