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/449/386/product-dating-information-mk.pdf
86578
Orthosilicate de tétraéthyle
≥99.0% (GC)
Synonyme(s) :
Ester tétraéthylique de l’acide orthosilicique, Silicate de tétraéthyle, Tétraéthyl silicate, TEOS, Tétraéthoxyde de silicium, Tétraéthoxysilane, Tétraéthoxysilicium(IV)
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72,30 $
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About This Item
72,30 $
Produits recommandés
Densité de vapeur
7.2 (vs air)
Niveau de qualité
Pression de vapeur
<1 mmHg ( 20 °C)
Essai
≥99.0% (GC)
Forme
liquid
Technique(s)
GC/GC: suitable
Indice de réfraction
n20/D 1.382 (lit.)
n20/D 1.383
pb
168 °C (lit.)
Densité
0.933 g/mL at 20 °C (lit.)
Chaîne SMILES
CCO[Si](OCC)(OCC)OCC
InChI
1S/C8H20O4Si/c1-5-9-13(10-6-2,11-7-3)12-8-4/h5-8H2,1-4H3
Clé InChI
BOTDANWDWHJENH-UHFFFAOYSA-N
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Catégories apparentées
Description générale
Application
- Comme réactif, avec du chlorure ferrique, dans la synthèse de dihydropyrimidinones.[8]
- Comme agent modificateur dans la fabrication d′un matériau détectant l′humidité, le poly(sulfonate de 2-acrylamido-2-méthylpropane) (poly-AMPS)[9].
- Comme milieu de synthèse de triarylamines et d′éthers diaryliques via une réaction d′Ullmann sans ligand catalysée par du cuivre[10].
- Comme précurseur pour la préparation d′un xérogel de silice, dont une application porte sur les vecteurs pharmaceutiques de médicaments[11].
- Comme précurseur dans la synthèse de particules de silice sphériques par le procédé Stöber.[12]
Mention d'avertissement
Warning
Mentions de danger
Conseils de prudence
Classification des risques
Acute Tox. 4 Inhalation - Eye Irrit. 2 - Flam. Liq. 3 - STOT SE 3
Organes cibles
Respiratory system
Code de la classe de stockage
3 - Flammable liquids
Classe de danger pour l'eau (WGK)
WGK 1
Point d'éclair (°F)
113.0 °F - closed cup
Point d'éclair (°C)
45 °C - closed cup
Équipement de protection individuelle
Eyeshields, Faceshields, Gloves, type ABEK (EN14387) respirator filter
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Certificats d'analyse (COA)
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Les clients ont également consulté
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How can I determine the shelf life / expiration / retest date of this product?
1 answer-
Helpful?
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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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What is the thermal conductivity of TEOS?
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Unfortunately, the thermal conductivity of this product is not determined.
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What is the electrical conductivity or resistivity of TEOS
1 answer-
This product is not tested for electrical conductivity. The compound is not expected to be a conductive material. The presence of TEOS in various coatings may impact the conductivity or resistivity of a given target compound, such as a metallic nanoparticle. See the links below to review articles that may be of interest:
https://www.researchgate.net/figure/Effect-of-the-addition-of-TEOS-on-a-density-b-resistivity-c-residual-magnetic_fig5_371096514
https://link.springer.com/article/10.1007/s12633-019-00180-yHelpful?
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According to the theise, TEOS was used in units of g. Do you sell powder or solid TEOS?
1 answer-
Tetraethyl orthosilicate is only available in the liquid state. The melting point of the pure compound is -82.5 °C. The density of this material is 0.933 g/mL.
See the link below to review the PubChem profile.
https://pubchem.ncbi.nlm.nih.gov/compound/Tetraethyl-orthosilicate#section=Melting-PointHelpful?
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What type of applications can Product No. 86578, Tetraethyl orthosilicate (TEOS), be used in?
1 answer-
TEOS can be used to synthesize sol-gels or aerogels.
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How do you create a sol-gel with Tetraethyl orthosilicate (TEOS), Product No. 86578?
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TEOS can be polymerized with water; the polymerization is based on the hydrolysis or the Si-O-Et groups through forming networks linked by Si-O-Si groups.
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How does the storage temperature relate to shipping conditions?
1 answer-
The storage conditions that a Sigma-Aldrich catalog and label recommend for products are deliberately conservative. For many products, long-term storage at low temperatures will increase the time during which they are expected to remain in specification and therefore are labeled accordingly. Where short-term storage, shipping time frame, or exposure to conditions other than those recommended for long-term storage will not affect product quality, Sigma-Aldrich will ship at ambient temperature. The products sensitive to short-term exposure to conditions other than their recommended long-term storage are shipped on wet or dry ice. Ambient temperature shipping helps to control shipping costs for our customers. At any time, our customers can request wet- or dry-ice shipment, but the special handling is at customer expense if our product history indicates that the product is stable for regular shipment.
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What is the Department of Transportation shipping information for this product?
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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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What are the applications of sol-gels formed from Tetraethyl orthosilicate (TEOS), Product No. 86578?
1 answer-
One of the most improtant application of the sol-gel process is the snythesis of zeolites. Other applications are optical ceramic materials or functionalized biosensors.
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