Module 3 : Chemical and non–chemical approach to materials synthesis - part 1

Lecture 19: Sol- Gel Science

• The Sol-Gel process allows to synthesize ceramic materials of high purity and homogeneity by a process occurs in liquid solution of organometallic precursors (TMOS, TEOS, Zr (IV)- Propoxide, Ti(IV)- Butoxide, etc.), which, by means of hydrolysis and condensation reactions, lead to the formation of a new phase (SOL).
M-O-R + H2 O M-OH + R-OH (hydrolysis)
M-OH + HO-M M-O-M + H2O (water condensation)
M-O-R + HO-M M-O-M + R-OH (alcohol condensation) (M = Si, Zr, Ti)