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TETRAETHOXYSILANE

CAS NO.: 78-10-4
EC/LIST NO.: 201-083-8

Tetraethoxsilane, Si(OC2H5)4.
Tetraethoxsilane is a colorless liquid that degrades in water.
Tetraethoxsilane is the ethyl ester of orthosilicic acid, Si(OH)4.
Tetraethoxsilane is the most prevalent alkoxide of silicon.

Tetraethoxsilane is a tetrahedral molecule.
Like its many analogues, Tetraethoxsilane is prepared by alcoholysis of silicon tetrachloride:

SiCl4 + 4 EtOH → Si(OEt)4 + 4 HCl

where Et is the ethyl group, C2H5, and thus EtOH is ethanol.

Tetraethoxsilane (TEOS) is an inorganic material that can be used as a silica source for the synthesis of silica-based materials such as silicon dioxide, silicon oxycarbides, silanol, siloxane polymer, and organosilicon thin films for a variety of applications.
Tetraethoxsilane can also be used in the synthesis of blended membranes, and the production of aerogel.
Other applications include coatings for carpets and other objects.

Ethyl silicate appears as a clear colorless liquid with a faint odor.
Flash point 125°F.
Less dense than water.
Vapors are heavier than air.

Tetraethoxysilane is the main precursor material for the synthesis of zeolites and silicon dioxide, which is used in semiconductor industry.
Tetraethoxsilane is widely used as cross linking agents in silicon polymers and in aerogel preparations.

Tetraethoxysilane is purified by passing impure material through a gas chromatographic separating column at a temperature below the boiling point of the pure tetraethoxysilane.
Separation of pure material from impurities occurs on the column, and the pure material is thereafter cooled and collected in a receiver.
The purified tetraethoxysilane has 99.999999% purity based on metals content.

Tetraethoxysilane is the chemical compound with the formula Si(OC2H5)4.
Often abbreviated Tetraethoxsilane this molecule consists of four ethyl groups attached to SiO44− ion, which is called orthosilicate.
As an ion in solution, orthosilicate does not exist. Alternatively Tetraethoxsilane can be considered to be the ethyl ester of orthosilicic acid, Si(OH)4.
Tetraethoxsilane is a prototypical alkoxide.
Tetraethoxsilane is mainly used as a crosslinking agent in silicone polymers and as a precursor to silicon dioxide in the semiconductor industry.
Tetraethoxsilane is also used as the silica source for synthesis of zeolites.
Other applications include coatings for carpets and other objects.
Tetraethoxsilane is used in the production of aerogel.
These applications exploit the reactivity of the Si-OR bonds.

A review is given on the determination of the thermodynamic properties of Si(OC2H5)4 (TEOS, tetraethoxysilane).
In addition, the thermal decomposition of Tetraethoxsilane has been studied by in-situ IR spectroscopy.
The decomposition products in the gas phase in the absence of oxygen are organic fragments (ethanol, ethanal, ethene, methane, carbon monoxide), and in the presence of oxygen water, carbon dioxide, ethanal and methanal.
The results are compared with thermodynamic equilibrium calculations and kinetic models.

Tetraethoxsilane article reports the easy to use approach on the application of tetraethoxysilane (TEOS) for the enhancement of drug release from mesoporous acrylic resin, in which a water insoluble drug is embedded.
Tetraethoxsilane system combines the swelling of polymer with gelation of silica precursor within the polymer matrix.
The nonsteroidal anti-inflammatory naproxen was used as a model drug and Amberlite XAD7HP was used as a drug carrier.
Tetraethoxysilane was introduced into the loaded polymer up to the total pore filling.
The transformation of tetraethoxysilane in aqueous solution at different pH produces condensed silica and ethanol which is a good solvent of naproxen.
Appearance of ethanol in the sample facilitates naproxen release into an external solution at differentiated pH.
The rate of release strongly depends on the pH of release solution due to differences in the hydrolysis and gelation rates of tetraethoxysilane.
The addition of tetraethoxysilane to the polymer-naproxen composite appears beneficial for drug transport into the external media.

Tetraethoxysilane was treated with Amberlyst 15 cation-exchange resin in the presence of butyl alcohols.
On treating the mixture of tetraethoxysilane and 1-butanol, the transesterification took place in which butoxyl groups were substituted for ethoxyl groups in tetraethoxysilane.
The degree of the transesterification depended on the molar ratio of tetraethoxysilane to 1-butanol of the mixture.
The distribution of alkoxysilane species present in the tetraethoxysilane–1-butanol solution was compared with the tetrabutoxysilane–ethanol solution, and it was found that the degree of the transesterification depended on the ratio of numbers of alkyl groups in tetraalkoxysilane and alcohol used.
The time required for equilibrium in the distribution of alkoxysilane species in the solution was different with the variety of butyl alcohols used, suggesting the presence of steric effect of butyl alcohols on this reaction.

In contrast to other low‐pressure chemical vapor deposition (LPCVD) processes for films, the deposition from tetraethoxysilane (TEOS) gas mixtures seems to be essentially controlled by by‐product inhibition.
We report an experimental study aimed at the verification of such a mechanism.
Ethanol was investigated as a possible inhibitor.
The results cannot be explained by by‐product inhibition alone.
We therefore conclude that the by‐product‐inhibited deposition from the primary reactant Tetraethoxsilane occurs in parallel with a deposition from a second precursor formed in the gas phase (intermediate product).
1999 The Electrochemical Society.
All rights reserved.

Tetraethoxysilane (TEOS) is used as a precursor in the industrial production of silica nanoparticles using thermal decomposition methods such as flame spray pyrolysis (FSP).
Despite the industrial importance of this process, the current kinetic model of high temperature decomposition of Tetraethoxsilane to produce intermediate silicon species and eventually form amorphous silica (α-SiO2) nanoparticles remains inadequate.
This is partly due to the fact only a small proportion of the possible species are considered.
This work presents the thermochemistry of practically all the species that can exist in the early stages of the reaction mechanism.
In order to ensure that all possible species are considered the process is automated by considering all species that can be formed from the reactions that are deemed reasonable in the standard ethanol combustion model in the literature

There are silicon compounds such as tetraethoxysilanes (TEOS), Si-OR, containing an oxygen bridge from silicon to an organic group.
SiSiB PC5420, orthosilicic acid ethyl ester, is a colorless, low viscosity liquid with a SiO2 content of 28.5%.

Tetraethoxsilane easily converts to silicon dioxide upon the addition of water:

Si(OC2H5)4 + 2 H2O → SiO2 + 4 C2H5OH

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 Tetraethoxsilane 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 Stöber process allows the formation of monodisperse and mesoporous silica.

At elevated temperatures (>600 °C), Tetraethoxsilane converts to silicon dioxide:

Si(OC2H5)4 → SiO2 + 2 (C2H5)2O

The volatile coproduct is diethyl ether.

The effects of tetraethoxysilane (TEOS) as an electrolyte additive on the electrochemical performance of lithium ion batteries with LiMn2O 4 cathode were investigated.
With 5% Tetraethoxsilane added, the capacity and cycling performance were improved, not only at room temperature, but also at low temperature, because of the formation of an effective solid electrolyte interphase (SEI) on the LiMn2O4 surface.
The results of scanning electron microscopy (SEM) of the LiMn2O4 cathode after the initial charge/discharge cycle proved the existence of this SEI.
Fourier transform infrared spectroscopy (FTIR) confirmed the compositions on the interface of the LiMn2O4 cathode.
The results showed that this kind of effective organosilicon compound could provide a new promising direction for the development of organic additives to improve the electrochemical performance of lithium-ion batteries.

Market.us report provides a basic overview of the Tetraethoxysilane (TEOS) Market industry, including definitions, classifications, applications, and industry chain. structure.
Tetraethoxsilane also ranks the market and provides analysis based on product type, applications, and region.
The Tetraethoxysilane (TEOS) market analysis is provided for the international markets, including development trends, competitive landscape analysis, and key regions development status.
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The data examined refers to both existing best players and future competitors.
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SWOT analysis and revenue share are shared in this report analysis.

Tetraethoxsilane (also orthosilicic acid esters) most commonly used as starting materials for sol-gels.
Polysilicic acidesters are condensation products obtained by incomplete hydrolysis or by orthosilicic acid esters.
Also, the sol-gel process.
which can be used as starting materials for · .
Can be hydrolyzed to form silicon dioxide (silica) Silicone rubber systems
Crosslinkers in Compositions
sealing drying agents Refractory fillers and pigments
Inorganic binder Pigments, fibers and other surfaces
for Coating material Chemical intermediate

Tetraethoxsilane is mainly used as a crosslinking agent in silicone polymers and as a precursor to silicon dioxide in the semiconductor industry.
Tetraethoxsilane is also used as the silica source for synthesis of some zeolites.
Other applications include coatings for carpets and other objects.
Tetraethoxsilane is used in the production of aerogel.
These applications exploit the reactivity of the Si-OR bonds.
Tetraethoxsilane 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%

Used as a binder for optical glass, chemical-resistant coatings and heat-resistant coatings.
Used for chemical-resistant coatings and heat-resistant coatings, and the hydrolyzed product can be used to make phosphors.
Used to synthesize organosilicon intermediates, as well as for refractory adhesives and precision casting, as room temperature vulcanized silicone rubber
Crosslinking agent.
Used in natural stone or other building materials, it can form silica sol-like inorganic substance (sio2) to enhance the strength of the substrate
Spend.
In glass and plastic lens materials, it can provide super-hard scratch-resistant coatings.

Tetraethoxsilane (TEOS) can be used:
As a reagent along with ferric chloride in the synthesis of dihydropyrimidinones.
As a modifier in fabrication of humidity sensing material, poly(2-acrylamido-2-methylpropane sulfonate) (poly-AMPS).
As a medium to synthesize triarylamines and diaryl ethers via copper catalyzed, ligand free-Ullmann reaction.
As a precursor for the preparation of silica xerogel which finds application in pharmaceutical drug carriers.
As a precursor for the synthesis of spherical silica particles by Stober process.

Commonly used as a precursor to prepare xerogel
Will interact with dodecylamine in the formation of intercalation compounds of H+-magadiite and used in a study of mixed-metal bioactive glasses.

Theproduct is mainly used in the manufacture of chemical-resist and heat-resist coatings, organosilicon solvents and adhesives of precision casting.

When be completely hydrolyzed, it will generate tiny silicon oxide powder which can be used in making fluorescent powder.
Applied to natural stones or other construction materials, it forms a silica-gel like binder (SiO2) that increases the substrate strength.
Polymerization of silicone resins for use in paints and other surface modification applications.
And it is the intermediate for sol-gel process.
Further more, it can improve the performance of other resins and also it is the material for making silicon macromolecular compounds.

IUPAC NAME :

Ethyl silicate

ethyl silicate

ethyl silicate

Orthosilicic acid tetraethyl ester, TEOS, Tetraethoxysilane

SILICIC ACID (H4SIO4), TETRAETHYL ESTER

Silicic Acid (H4SiO4), Tetraethyl Ester

Silicic acid, tetraethyl ester

TEOS

Tetraethoxysilane

tetraethoxysilane

Tetraethyl Orthosilicate

SYNONYMS:

Tetraethyl orthosilicate
201-083-8
78-10-4
MFCD00009062
Orthosilicate de tétraéthyle
Orthosilicic acid tetraethyl ester
Orthosilicic acid, tetraethyl ester
Silicate d'ethyle
Silicic acid (H4SiO4), tetraethyl ester
Silicon tetraethoxide