131903

Tetraethyl orthosilicate

reagent grade, 98%

• Synonym(s): Orthosilicic acid tetraethyl ester, Silicon tetraethoxide, TEOS, Tetraethoxysilane, Tetraethoxysilicon(IV), Tetraethyl silicate
• Linear Formula: Si(OC₂H₅)₄
• CAS Number: 78-10-4
• Molecular Weight: 208.33
• Beilstein/REAXYS Number: 1422225
• EC Number: 201-083-8
• MDL number: MFCD00009062
• UNSPSC Code: 12352103
• PubChem Substance ID: 24848042
• NACRES: NA.23

Properties

• grade: reagent grade
• Quality Level: 200
• vapor density: 7.2 (vs air)
• vapor pressure: <1 mmHg ( 20 °C)
• assay: 98%
• form: liquid
• refractive index: n20/D 1.382 (lit.)
• bp: 168 °C (lit.)
• density: 0.933 g/mL at 20 °C (lit.)
• SMILES string: 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
• InChI key: BOTDANWDWHJENH-UHFFFAOYSA-N

Description

General description

Tetraethyl orthosilicate(TEOS) is a colorless liquid alkoxide widely used as precursor to deposition of silicon dioxide (SiO₂) thin films. It is also utilized in hydrogels, nanoparticle-based drug delivery systems, and chemical crosslinking of polymers.

Application

Commonly used as a precursor to prepare xerogel

Tetraethyl orthosilicate can be used:

• As an anti-solvent to fabricate efficient perovskite layer for inverted planar solar cells with enhanced power conversion efficiency and reproducibility. TEOS helps to achieve high-quality perovskite films with reduced density of defects, and thus slower carrier recombination.
• As a sol-gel precursor to synthesize SiO₂-TiO₂ anti-reflective self-cleaning coatings for solar cells.
• To fabricate nano silica functionalized crosslinked hybrid membranes for proton exchange membrane fuel cell applications. These membranes have better proton conductivity and thermal stability.
• To prepare poly(vinylidene fluoride)/TEOS matrix separator to enhance the performance of Li-ion batteries. The separator exhibits excellent electrolyte retention and wettability.

Will interact with dodecylamine in the formation of intercalation compounds of H⁺-magadiite and used in a study of mixed-metal bioactive glasses.

Features and Benefits

• Excellent adhesion on substrates
• Uniform film deposition
• Cross-linker to introduce polymer strands into hydrogel

Safety Information

• pictograms: GHS02,GHS07
• signalword: Warning
• hcodes: H226,H319,H332,H335
• pcodes: P210 - P233 - P240 - P241 - P304 + P340 + P312 - P305 + P351 + P338
• Hazard Classifications: Acute Tox. 4 Inhalation - Eye Irrit. 2 - Flam. Liq. 3 - STOT SE 3
• target_organs: Respiratory system
• Storage Class: 3 - Flammable liquids
• wgk_germany: WGK 1
• flash_point_f: 113.0 °F - closed cup
• flash_point_c: 45 °C - closed cup
• ppe: Eyeshields, Faceshields, Gloves, type ABEK (EN14387) respirator filter