Tetraethyl orthosilicate (TEOS), also known as tetraethoxysilane, is an organosilicon compound with the chemical formula Si(OC₂H₅)₄. This colorless liquid undergoes hydrolysis when exposed to water and forms silica networks through condensation reactions. TEOS is the ethyl ester of orthosilicic acid and is one of the most widely used silicon alkoxide compounds.
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