Abstract
Kaolinite is characterized by three exposed surfaces of different chemical composition. Adsorption measurements in dilute suspensions of radioactively labelled polyacrylamide as a function of surface area on several well-fractionated kaolinite samples, indicate that polyacrylamide is preferentially adsorbed on the platelet edge. The effect of polymer addition on the stability of the clay suspension was determined in concentrated medium. The stability and/or destabilisation behavior of the suspension in presence of polymer reflects the edge face—polymer association. The nature of adsorption forces and the mode of clay particle aggregation are discussed.
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