CBEMS 160 Lecture Notes - Lecture 1: Siloxane, Condensation Reaction, Hydrolysis
8 Mar 2018
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Please read over the manual and reference 1 before coming to lab on day 1. Please print references or bring your laptop for access to all listed references during lab. Reference information is provided at the end of this manual and on the course website. Sol-gels are special solutions that have the potential to turn into gels via polymerization. The transition is marked by a dramatic increase in viscosity. The sol-gel reaction can be catalyzed under acidic or basic conditions that initiate the sequential reactions depicted in figure 1 of hydrolysis and condensation polymerization. The most popular sol-gel is made up of silicon dioxide (sio2) in which a silicon atom is covalently bound to four oxygen atoms. The main goal during polymerization is to form the siloxane (si- As the reaction persists, the number of siloxane bonds will increase and the network will grow into a particle during nucleation and growth processes, figure 2.
