Sol-gel silicas were synthesized from the hydrolysis of tetraethoxysilane and N-beta-aminoethyl-gamma-aminopropyltrimethoxysilane in the presence of water and ethanol by using ammonium hydroxide or hydrochloric acid as base or acid catalysts, respectively. The influence of the type of the catalyst e
Simple model for the instabilities in the aggregation of silica sols in a sol-gel process
✍ Scribed by Rogelio Rodríguez; Rubén Arroyo
- Publisher
- Springer
- Year
- 1994
- Tongue
- English
- Weight
- 828 KB
- Volume
- 3
- Category
- Article
- ISSN
- 0928-0707
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The sol-gel transition of the system tetramethylorthosilicate-water-methanol under basic conditions has been studied by rheological measurements. The gelation time t(g) has been determined from the measurements of the elastic G' and viscous G'' moduli as a function of time at different frequencies a