Flocculating a boehmite sol with ammonia results in drying and shrinkage uniformity which contributes to the formation of a dry monolithic gel. It is demonstrated that flocculation immobilizes the randomly dispersed platelet‐shaped boehmite particles, inducing uniform shrinkage and density in the gel structure. Flocculation also increases the rate of gelation and an increased gel integrity is attributed to the cumulative effects of both van der Waals attractive forces and increased hydrogen bond formation (gelation). Flocculation does not adversely effect either phase transformation or sintering of the seeded boehmite gels.
|Number of pages
|Journal of the American Ceramic Society
|Published - Sep 1989
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry