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Electroacoustic Study of Adsorption of Cetylpyridinium Chloride on Kaolinite

Published online by Cambridge University Press:  28 February 2024

William N. Rowlands  and
Robert J. Hunter
William N. Rowlands
Affiliation:
School of Chemistry, University of Sydney, N.S.W., 2006 Australia
Robert J. Hunter
Affiliation:
School of Chemistry, University of Sydney, N.S.W., 2006 Australia
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Abstract

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Adsorption of cetylpyridinium chloride (CPC) onto kaolinite can be followed using the electroacoustic effect. The dynamic mobility, measured at a frequency of 1 MHz, varies from about −2 to +1 × 10−8 m2 V−1 s−1 in a number of steps, reflecting the adsorption of two separate layers, with the bilayer being more obvious, especially at pH 5–8. The behaviour at different pHs reflects the different charge characteristics of the basal cleavage planes and the crystal edges. When the amount of added CPC is equal to the cation exchange capacity of the clay, the kinetic charge changes from negative to positive and there is a pronounced break in the conductivity curve. It is also possible to estimate the edge to face area from such measurements and so obtain a measure of the aspect ratio of the clay crystallites. The (minimum) value for this clay is about 5:1.

Keywords

ElectroacousticsAdsorptionCetylpyridinium ionKaolinElectrokineticsDynamic mobility
Type
Research Article
Information
Clays and Clay Minerals , Volume 40 , Issue 3 , June 1992 , pp. 287 - 291
Copyright
Copyright © 1992, The Clay Minerals Society

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