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
637246
Silicon dioxide
Greener Alternative
nanopowder (spherical, porous), 5-20 nm particle size (TEM), 99.5% trace metals basis
Synonym(s):
Silica, Nanosilica, Silicon dioxide
Select a Size
| Size/SKU | Availability | Price |
|---|---|---|
50 g | Available to ship TODAYfromMILWAUKEE | $165.00 |
500 g | Check Cart for Availability | $409.00 |
250 g | Available to ship TODAYfromMILWAUKEE | $688.00 $516.00 |
About This Item
$165.00
Available to ship TODAYDetails
Quality Segment
assay
99.5% trace metals basis
form
nanopowder (spherical, porous)
composition
SiO2
reaction suitability
core: silicon
greener alternative product characteristics
Design for Energy Efficiency
Design for Energy Efficiency
Learn more about the Principles of Green Chemistry.
sustainability
Greener Alternative Product, Greener Alternative Product
surface area
590-690 m2/g , TEM
particle size
5-20 nm (TEM)
bp
2230 °C (lit.)
mp
>1600 °C (lit.)
density
2.2-2.6 g/mL at 25 °C
bulk density
0.068 g/mL
application(s)
glass & ceramic
SMILES string
O=[Si]=O
InChI
1S/O2Si/c1-3-2
InChI key
VYPSYNLAJGMNEJ-UHFFFAOYSA-N
General description
Application
- Pickering emulsion polymerization using a silicon dioxide nanoparticle stabilizer to form molecularly imprinted polymers for steroid recognition.
- Mesoporous silica is used as a catalyst support in the preparation of multiwalled carbon nanotubes (MWCNTs).
- It is used as a ring opening of tetrahydrofuran-dimethanol to 1,2,6-hexanetriol.
- It maybe used to prepare silica/brominated poly(phenylene oxide) nanocomposites membranes for CO2 seperations.
- The composite scaffold of chitosan/chondroitin sulfate/nano-SiO2 was fabricated by lyophilization.PMID 22515103
- Nanocomposites preparation of silica, single-wall carbon nanotubes, and graphite nanoplatelets in an epoxy matrix have been reported.6
- Dielectric spectroscopy study of the polystyrene/nanosilica model system has been studied.
- PMMA SiO2 nanocomposites were reported to be synthesized.
1 of 1
This Item | |||
|---|---|---|---|
| description nanopowder (spherical, porous), 5-20 nm particle size (TEM), 99.5% trace metals basis | description nanopowder, 10-20 nm particle size (BET), 99.5% trace metals basis | description hollow nanoparticles, 1000 nm particle size, pore size 40 Å | description hollow nanoparticles, 500 nm particle size, pore size 40 Å |
| form nanopowder (spherical, porous) | form nanopowder | form powder | form powder |
| surface area 590-690 m2/g , TEM | surface area - | surface area - | surface area - |
| particle size 5-20 nm (TEM) | particle size 10-20 nm (BET) | particle size 1000 nm | particle size 500 nm |
| assay 99.5% trace metals basis | assay 99.5% trace metals basis | assay - | assay - |
| composition SiO2 | composition SiO2 | composition - | composition - |
| density 2.2-2.6 g/mL at 25 °C | density 2.2-2.6 g/mL at 25 °C | density - | density - |
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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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Could you please provide the pore size of this material? Thanks!
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The pore size of this product is not determined.
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How is shipping temperature determined? And how is it related to the product storage temperature?
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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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