This product is not assigned a specific grade and is intended for research use in general laboratory applications.
420840
LUDOX® AS-40 colloidal silica
40 wt. % suspension in H2O
Synonym(s):
Silica preparation
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$142.80
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$567.00
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About This Item
Linear Formula:
SiO2
CAS Number:
Molecular Weight:
60.08
MDL number:
UNSPSC Code:
12352309
PubChem Substance ID:
NACRES:
NA.22
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description
colloidal
Quality Level
form
liquid
concentration
40 wt. % suspension in H2O
surface area
~135 m2/g
pH
9.1
density
1.295 g/mL at 25 °C
SMILES string
O=[Si]=O
InChI
1S/O2Si/c1-3-2
InChI key
VYPSYNLAJGMNEJ-UHFFFAOYSA-N
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This Item | 420816 | 420875 | 420786 |
|---|---|---|---|
| description colloidal | description colloidal | description colloidal | description colloidal |
| form liquid | form viscous liquid | form liquid | form liquid |
| concentration 40 wt. % suspension in H2O | concentration 40 wt. % suspension in H2O | concentration 30 wt. % suspension in H2O | concentration 40 wt. % suspension in H2O |
| surface area ~135 m2/g | surface area ~220 m2/g | surface area 198-250 m2/g | surface area ~140 m2/g |
| pH 9.1 | pH 9.8 | pH 8.6-9.3 | pH 9.0 |
| density 1.295 g/mL at 25 °C | density 1.3 g/mL at 25 °C | density 1.21 g/mL at 25 °C | density 1.3 g/mL at 25 °C |
General description
LUDOX® AS-40 colloidal silica is used as a silica source in the preparation of zeolites.[1]
Application
Legal Information
LUDOX is a registered trademark of W.R. Grace & Co.-Conn.
Storage Class
12 - Non Combustible Liquids
wgk_germany
nwg
flash_point_f
Not applicable
flash_point_c
Not applicable
ppe
Faceshields, Gloves, Goggles, type ABEK (EN14387) respirator filter
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The static aging effect on the seedless synthesis of different ranges FAU-type zeolite Y at various factors
Al-Jubouri, et al.
Iraqi Journal of Chemical and Petroleum Engineering, 20, 7-13 (2019)
Gel?Infused Slippery Surface with Enhanced Longevity and Thermally Controllable Sliding Properties.
Zhu G H, et al.
Advanced Materials Interfaces, 3(20), 1600515-1600515 (2016)
Separation of water?acetic acid mixtures by pervaporation using a thin mordenite membrane.
Li G, et al.
Separation and Purification Technology, 32(1-3), 199-206 (2003)
New opportunities in Stober synthesis: preparation of microporous and mesoporous carbon spheres
J Choma, et al.
Journal of Materials Chemistry, 22, 12636-12642 (2012)
Interfacial Water Drives Improved Proton Transport in Siliceous Nanocomposite Nafion Thin Films
PJ Goossens, et al.
ChemPhysChem, 19, 538-546 (2018)
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is this ACS grade or Reagent grade?
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What percentage of ammonia is present in this solution?
1 answer-
Ludox AS is stabilized with ammonium hydroxide rather than sodium hydroxide. The concentration is not reported, however there is an expected range of 0.1 - 0.2%.
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How can I determine the shelf life / expiration / retest date of this product?
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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.pdfHelpful?
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What is the size of the nanoparticles?
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The particle size of this product is 20-24 nanometers.
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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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