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Higher-order structure formation of ultrafine boehmite particles in sols, gels, and dried materials

Higher-order structures formed by ultrafine boehmite particles (diameter = several nm) in the aqueous sol or gel state as well as dried materials have been studied. The sol solutions containing the primary particles of boehmite are optically isotropic, but become optically anisotropic by the additio...

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Bibliographic Details
Published in:Journal of colloid and interface science 1988, Vol.125 (1), p.155-161
Main Authors: Fukasawa, Jun-Ichi, Tsujii, Kaoru
Format: Article
Language:English
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Summary:Higher-order structures formed by ultrafine boehmite particles (diameter = several nm) in the aqueous sol or gel state as well as dried materials have been studied. The sol solutions containing the primary particles of boehmite are optically isotropic, but become optically anisotropic by the addition of a desired amount of electrolytes. A further increase in electrolyte concentration changes the sol solution to a jelly state which exhibits strong optical anisotropy. These phenomena may result from the one-dimensional aggregation of primary particles by edge to edge linkage of the primary particles and network formation by bridge linkage between the above one-dimensional aggregates. Unique slit-shaped or honeycomb-like structures constructed with thin walls of boehmite are observed when the sols and/or gels are frozen or lyophilized. In these structures, the plane (010) of the boehmite primary particle is set parallel to the plane of the thin walls which are composed of stacked layers of the primary particles in the direction of the b-axis.
ISSN:0021-9797
1095-7103
DOI:10.1016/0021-9797(88)90064-1