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Alumina Monolith Formation by Flocculation of Boehmite Sols
Author(s) -
Horn Debra S.,
Messing Gary L.
Publication year - 1989
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1989.tb06310.x
Subject(s) - boehmite , flocculation , chemical engineering , shrinkage , materials science , sintering , monolith , phase (matter) , van der waals force , chemistry , composite material , catalysis , organic chemistry , molecule , aluminium , engineering
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.