637238 Sigma-Aldrich

Silicon dioxide

nanopowder, 10-20 nm particle size (BET), 99.5% trace metals basis

Synonym: Silica, Silicon dioxide



Related Categories 14: Si, Biomedical Materials, Materials Science, Metal and Ceramic Science, Nanomaterials,
assay   99.5% trace metals basis
form   nanopowder
particle size   10-20 nm (BET)
bp   2230 °C (lit.)
mp   >1600 °C (lit.)
density   2.2-2.6 g/mL at 25 °C
bulk density   0.011 g/mL
storage temp.   room temp
SMILES string   O=[Si]=O
InChI   1S/O2Si/c1-3-2


General description

The refractive index of silica nanoparticles is similar to polymeric coatings, so it finds several applications in the preparations of nanocomposites. Properties suh as, thermal resistance, electrical and mechanical are enhanced. Silica nanoparticles find uses in various fields of catalysts, pigment stabilization, electronics and sensors.


Silica nanoparticles have been used :
• To study the nonlinear optical properties of SiO2 nanocomposites in weak optical fields.
• As a nanoadditive in nanocomposite calcium alginate fibers.
• As dispersant in liquid polymethylsiloxane to exihibit unique optical non linearity in low intensity visible radiation fields.


250, 500 g in poly drum

50 g in glass bottle

Safety & Documentation

Safety Information

Personal Protective Equipment 
NONH for all modes of transport
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


Certificate of Analysis (COA)

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Certificate of Origin (COO)

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Frequently Asked Questions

Which document(s) contains shelf-life or expiration date information for a given product?
If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.
How do I get lot-specific information or a Certificate of Analysis?
The lot specific COA document can be found by entering the lot number above under the "Documents" section.
How do I find price and availability?
There are several ways to find pricing and availability for our products. Once you log onto our website, you will find the price and availability displayed on the product detail page. You can contact any of our Customer Sales and Service offices to receive a quote. USA customers: 1-800-325-3010 or view local office numbers.
What is the Department of Transportation shipping information for this product?
Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product.
Is Product 637238, Silica,crystalline?
Our information indicates that product 637238 is amorphous.
Does this product contain hydroxyl groups?
We have not determined the presence of OH groups in this product, but it seems likely.One can do FT-IR analysis on this product.
What does "TEM" mean on the Specification Sheet?
TEM stands for transmission electron microscopy.
Have any papers cited use of Product 637238, Silica?
One publication has specifically mentioned use of product 637238, in environmental research.
My question is not addressed here, how can I contact Technical Service for assistance?
Ask a Scientist here.
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Protocols & Articles


Advanced Inorganic Materials for Solid State Lighting

In 1907, the first electroluminescent device, with silicon carbide (Prod. Nos. 594911, 378097, 357391) as the active material, was described by Henry Round as displaying a “bright glow”.1,2 Lighting ...
Alexander Birkel, Kristin A. Denault, Nathan C. George, Ram Seshadri
Material Matters, Volume 7, Number 2, 22–27
Keywords: Capillary electrophoresis, Chromatin immunoprecipitation, Combustion, Ligands, Microwave synthesis, Sol-gel, Substitutions

Bio-Inspired “Green” Synthesis of Nanomaterials and their Applications

Dr. Siddharth V. Patwardhan Department of Chemical and Process Engineering University of Strathclyde, 75 Montrose Street Glasgow G1 1XJ, UK Email:
Keywords: Adsorption, Agriculture, Apoptosis, Cancer, Catalysis, Condensations, Cosmetics, Deposition, Environmental, Enzyme activity, Green chemistry, Hydration reaction, Immobilization, Microwave synthesis, Nanomaterials, Pharmaceutical, Precipitation, Reductions, Separation, Sol-gel, Solvents

Materials for Clean H2 Production from Bioethanol Reforming

Hong Xie, Eric Weitz, and Kenneth R. Poeppelmeier* Center for Catalysis and Surface Science, Department of Chemistry Northwestern University Evanston, Illinois 60208 *
Keywords: Absorption, Adsorption, Boudouard reaction, Catalysis, Dehydration reaction, Dehydrogenation, Deposition, Fermentation, Polymerization reactions, Precipitation, Redox Reactions, Renewable energy, Surface Science

Recent Developments in Silicon Anode Materials for High Performance Lithium-Ion Batteries

Xuefeng Song,1* Xiaobing Wang,2 Zhuang Sun,1 Peng Zhang,1 and Lian Gao1 1State Key Laboratory for Metallic Matrix Composite Materials, School of Materials Science and Engineering, Shanghai Jiao Tong ...
Keywords: Automotive, Deposition, Diffusion, Electrochemical reactions, Environmental, Lithiations, Materials Science, Microscopy, Nanomaterials, Nanotubes, Polymerization reactions, Reductions, Scanning electron microscopy, Transmission electron microscopy

Peer-Reviewed Papers


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