131903
Tetraethyl orthosilicate
reagent grade, 98%
Synonym(s):
Orthosilicic acid tetraethyl ester, Silicon tetraethoxide, TEOS, Tetraethoxysilane, Tetraethoxysilicon(IV), Tetraethyl silicate
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About This Item
Linear Formula:
Si(OC2H5)4
CAS Number:
Molecular Weight:
208.33
UNSPSC Code:
12352103
NACRES:
NA.23
PubChem Substance ID:
EC Number:
201-083-8
Beilstein/REAXYS Number:
1422225
MDL number:
InChI key
BOTDANWDWHJENH-UHFFFAOYSA-N
InChI
1S/C8H20O4Si/c1-5-9-13(10-6-2,11-7-3)12-8-4/h5-8H2,1-4H3
SMILES string
CCO[Si](OCC)(OCC)OCC
grade
reagent grade
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.)
Quality Level
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General description
Tetraethyl orthosilicate (TEOS) is a high-purity (98%) colorless liquid silicon alkoxide widely used as a moisture-sensitive precursor to silicon dioxide (SiO₂). Through sol–gel hydrolysis and condensation, TEOS enables the formation of silica-based networks, aerogels, thin films, nanoparticles, and mesoporous structures. Its controlled reactivity and compatibility with catalysts and templating agents make it valuable in the chemical crosslinking of polymers and the fabrication of advanced materials for coatings, catalysis, hydrogels, biomedical devices, and nanoparticle-based drug delivery systems.
Application
Commonly used as a precursor to prepare xerogel
Tetraethyl orthosilicate can be used:
- 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.
- An anti-solvent to fabricate an 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 precursor to prepare the xerogel.
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
signalword
Warning
hcodes
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
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
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Nanoscale research letters, 14(1), 109-109 (2019-03-30)
The nowadays growing use of nanoparticles (NPs) in commercial products does not match a comprehensive understanding of their potential harmfulness. More in vitro investigations are required to address how the physicochemical properties of NPs guide their engulfment within cells and
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Colloids and surfaces. B, Biointerfaces, 101, 97-100 (2012-07-17)
Hollow silica spheres with round mesoporous shells were synthesized by core-shell template method, using monodispersed cationic polystyrene particles as core, and TEOS (tetraethoxysilane) as the silica source to form shell. After calcination at 550°C, uniform spheres with a thin shell
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