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/418/501/product-dating-information-06-25-mk.pdf
637238
Silicon dioxide
nanopowder, 10-20 nm particle size (BET), 99.5% trace metals basis
Synonym(s):
Silica, Nanosilica, Silicon dioxide
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$135.00
$572.00
$868.00
$135.00
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About This Item
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InChI key
VYPSYNLAJGMNEJ-UHFFFAOYSA-N
InChI
1S/O2Si/c1-3-2
SMILES string
O=[Si]=O
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
Quality Level
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This Item | |||
|---|---|---|---|
| particle size 10-20 nm (BET) | particle size 5-20 nm (TEM) | particle size 1000 nm | particle size 1000 nm |
| form nanopowder | form nanopowder (spherical, porous) | form powder | form powder |
| assay 99.5% trace metals basis | assay 99.5% trace metals basis | assay - | assay - |
| bulk density 0.011 g/mL | bulk density 0.068 g/mL | bulk density - | bulk density - |
| Quality Level 100 | Quality Level 100 | Quality Level 100 | Quality Level 100 |
| density 2.2-2.6 g/mL at 25 °C | density 2.2-2.6 g/mL at 25 °C | density - | density - |
General description
Application
- 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.
Storage Class
11 - Combustible Solids
wgk
nwg
flash_point_f
Not applicable
flash_point_c
Not applicable
ppe
dust mask type N95 (US), Eyeshields, Gloves
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How can I determine the shelf life / expiration / retest date of this product?
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What size range are the granules in this product?
1 answer-
As listed in the 'PROPERTIES' section, the particle size is 10-20 nm (BET).
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구 모양의 파티클 인가요? O < == 이런 모양 일까요?
1 answer-
This product is not specified to be spherical. If a spherical nanoparticle is required, product 637246 would be the best option.
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What is the surface area of this product according to BET?
1 answer-
The surface area of this material is not determined on a lot to lot basis. However, historical data indicate a specific surface area range of 25 - 50 m2/g.
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How is shipping temperature determined? And how is it related to the product storage temperature?
1 answer-
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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¿Do you offer silica nanoparticles for impermeabilization of textile? We bought this product last year: silica nanopowder, 10-20 nm particle size (BET), 99.5% trace metals basis ref. 637238 - but it didn´t work for that application
1 answer-
There are several silica nanoparticles offered, however, these are not specifically for the coating of textiles.
The products below may or may not be suitable for the specified application:
https://www.sigmaaldrich.com/product/aldrich/748161
https://www.sigmaaldrich.com/product/aldrich/637246
https://www.sigmaaldrich.com/product/aldrich/718483Helpful?
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what is BET? abbreviation of BET?
1 answer-
BET stands for Brunauer-Emmett-Teller. It is a surface analysis technique used to measure specific surface area, pore size distribution, and particle size.
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What is the shelf life (useful life) of Silicon dioxide (637246-50G) nano powder having CAS No. 7631-26-9
1 answer-
This product does not contain an expiration date or recommended retest date. Products with no expiration date or recommended retest date should be routinely inspected by customers to ensure they perform as expected. These products are also subject to a one year warranty from the date of shipment. For more information you may access the "Product Dating Information" document under "ADDITIONAL USEFUL DOCUMENTS ABOUT OUR PRODUCTS" at the bottom of the Quality Services page with this link: https://www.sigmaaldrich.com/life-science/quality-and-regulatory-management/quality-services
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I need food-grade silicon dioxide. is it available or not?
1 answer-
We do not offer a food-grade silicon dioxide. However, we do offer a pharmaceutical grade silicon dioxide that can be used for food grade applications. Please see this product: https://www.sigmaaldrich.com/product/mm/113126.
Our food grade items reside in our flavors and fragrance portfolio and will typically start with a "W" in the product code. To look into the food grade products we offer please see this link to our flavors and fragrance product portfolio: https://www.sigmaaldrich.com/products/chemistry-and-biochemicals/flavors-and-fragrances?country=US&language=en&cmsRoute=products&cmsRoute=chemistry-and-biochemicals&cmsRoute=flavors-and-fragrances&page=1&searched=Silicon+dioxide
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What is the Department of Transportation shipping information for this product?
1 answer-
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.
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