tetraetyylioftisilikaatti

Tetraethyl orthosilicate, often abbreviated as TEOS, is a chemical compound with the formula Si(OC2H5)4. It is a clear, colorless liquid that is widely used in the production of silica-based materials. TEOS is a silicon alkoxide, which means it contains a silicon atom bonded to four ethoxy groups. This structure makes it a valuable precursor in the synthesis of silica gels, glasses, and ceramics.

The primary use of TEOS is in the sol-gel process, where it undergoes hydrolysis and condensation reactions to form a silica network. This process involves the reaction of TEOS with water, which cleaves the ethoxy groups, leading to the formation of silanol groups. These silanol groups can then condense with each other or with other silanol groups from other TEOS molecules, resulting in the growth of a silica network.

TEOS is also used as a precursor in the chemical vapor deposition (CVD) process for the deposition of silica films. In this process, TEOS is vaporized and then transported to a substrate where it undergoes hydrolysis and condensation reactions, leading to the deposition of a silica film.

TEOS is a hazardous chemical and should be handled with care. It is toxic if ingested, inhaled, or absorbed through the skin. It is also flammable and can react with strong oxidizing agents. Proper safety measures, including the use of personal protective equipment and ventilation, should be taken when handling TEOS.