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Relation among the Aggregation of Boehmite Particles in Sols, Microstructure of Gels, nod Crystallization of Corundum

Z. Holková, L. Pach, D. Lath, and J. Krištín

Department of Ceramics, Class, and Cement, Faculty of Chemical and Food Technology, Slovak University of Technology, SK-842 37 Bratislava

 

E-mail: ladislav.pach@stuba.sk

Received: 14 November 2002

Abstract: Aggregation of boehmite particles in sole was studied by dynamic light scattering and corresponding gels were examined by DTA, XRD, BET, SEM, and TEM. Commercial Condea boehmite particles of the size 3-5 nm aggregated in sols into fibres. An aggregation and desegregation was a reversible process. Fibres were disintegrated during drying, but the repulsive forces between particles oriented them into characteristic microstructures. These microstructures were less dependent on the composition of sots. Similarly, nucleation density of α-Al2O3 increased slightly (from N = 6.1 × 108 to 3.1 × 109 cm-3) with the content of boehmite in sols from 10.0 and 14.7 mass %, respectively.

Full paper in Portable Document Format: 583a149.pdf

 

Chemical Papers 58 (3) 149–154 (2004)

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