$19.95 Buy It Now or Best Offer
free,30-Day Returns
Seller Store backyard-science-2000
(775) 99.2%,
Location: Salt Lick, Kentucky
Ships to: US,
Item: 335658785995
All returns accepted:ReturnsNotAccepted
BYS2K:BYS2K
Expiration Date:01/01/2030
Type:Liquid for experiments
Unit Type:oz
1.1:1.1
MPN:BYS-TEOS.55.ML-2K
Country/Region of Manufacture:United States
Unit Quantity:2
Intended Use/Discipline:Chemistry
California Prop 65 Warning:N/A
Tetraethyl Orthosilicate 55ml in glass bottles. Tetraethyl orthosilicate, formally named tetraethoxysilane (TEOS), ethyl silicate is the organic chemical compound with the formula Si(OC2H5)4. TEOS is a colorless liquid. It degrades in water. TEOS is the ethyl ester of orthosilicic acid, Si(OH)4. It is the most prevalent alkoxide of silicon. TEOS is a tetrahedral molecule. Like its many analogues, it is prepared by alcoholysis of silicon tetrachloride. TEOS is mainly used as a crosslinking agent in silicone polymers and as a precursor to silicon dioxide in the semiconductor industry. TEOS is also used as the silica source for synthesis of some zeolites. Other applications include coatings for carpets and other objects. TEOS is used in the production of aerogel. These applications exploit the reactivity of the Si-OR bonds. TEOS has historically been used as an additive to alcohol based rocket fuels to decrease the heat flux to the chamber wall of regeneratively cooled engines by over 50%. TEOS is used in steel casting industry as an inorganic binder and stiffener for making silica-based ceramic molding forms (see also sodium silicate). As inorganic binder for coatings (passivation) of different materials such as steel, glass, brass, and even wood in order to make surfaces water-, oxygen- and high-temperature resistant. As additive to solid polymers to enhance adhesiveness to glass, steel or wood. As a binder for porcelain teeth crowns. As precursor to siloxanes. TEOS easily converts to silicon dioxide upon the addition of water. An idealized equation is shown, in reality the silica produced is hydrated. This hydrolysis reaction is an example of a sol-gel process. The side product is ethanol. The reaction proceeds via a series of condensation reactions that convert the TEOS molecule into a mineral-like solid via the formation of Si-O-Si linkages. Rates of this conversion are sensitive to the presence of acids and bases, both of which serve as catalysts. The Stber process allows the formation of monodisperse and mesoporous silica. At elevated temperatures (>600 C), TEOS converts to silicon dioxide. TEOS is also used in the production of synthetic opals, videos of which can be followed on YouTube by a channel called “Thought Emporium” and antique called “NightHawkInLight”. I also will be making a video this summer on making opals from this materials under the same name that I use on here. Keep an eye out for it! You will receive: 1- 55ml bottle of TEOS and that bottle will have its lid taped shut to protect the liquid. That will then have a tamper seal applied and it will be bagged and bubble wrapped for safety and placed in a labeled box. That box will be bagged and shipped in a bubble wrap padded blue envelope and shipped using USPS Ground Mail with tracking. You should receive it within a few days of shipping.
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