ANOMALOUS AGGREGATION BEHAVIOR OF ALUMINUM OXYHYDROXIDES

Authors
BEATTIE JK CLEAVER JK WAITE TD
Citation
Jk. Beattie et al., ANOMALOUS AGGREGATION BEHAVIOR OF ALUMINUM OXYHYDROXIDES, Colloids and surfaces. A, Physicochemical and engineering aspects, 111(1-2), 1996, pp. 131-138
Citations number
18
Categorie Soggetti
Chemistry Physical
Journal title
Colloids and surfaces. A, Physicochemical and engineering aspects → ACNP
ISSN journal
09277757
Volume
111
Issue
1-2
Year of publication
1996
Pages
131 - 138
Database
ISI
SICI code
0927-7757(1996)111:1-2<131:AABOAO>2.0.ZU;2-L
Abstract
The aggregation of alumina suspensions (gamma-alumina, boehmite and gi bbsite) has been observed by light scattering as a function of the ide ntity and concentration of added electrolyte, and of acidic pH. All th e suspensions aggregated rapidly in the presence of less than 1 mM sul fate ion. The gibbsite suspension displayed a critical coagulation con centration of less than 50 mM chloride ion. The other three suspension s displayed anomalous stability in chloride solutions of concentration s greater than 0.1 M and only aggregated at higher chloride ion concen trations. This stability is not related to the pH and electrolyte depe ndence of the zeta potential.