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Influence of Exchangeable Cations on the Surface Free Energy of Kaolinite as Determined from Contact Angles

Published online by Cambridge University Press:  02 April 2024

Bronisław Jańczuk
Affiliation:
Department of Physical Chemistry, Institute of Chemistry, Maria Curie-Skłodowska University, 20-031 Lublin, Poland
Emil Chibowski
Affiliation:
Department of Physical Chemistry, Institute of Chemistry, Maria Curie-Skłodowska University, 20-031 Lublin, Poland
Mieczysław Hajnos
Affiliation:
Institute of Agrophysics, Polish Academy of Sciences, Lublin, Poland
Tomasz Białopiotrowicz
Affiliation:
Department of Physical Chemistry, Institute of Chemistry, Maria Curie-Skłodowska University, 20-031 Lublin, Poland
Janusz Stawiński
Affiliation:
Institute of Agrophysics, Polish Academy of Sciences, Lublin, Poland

Abstract

The influence of adsorbed H+, Na+, K+, Ca2+, Mg2+, Ba2+, and Al3+ ions on the wettability of a kaolinite surface was determined from contact angles, which were measured in kaolinite-water drop-air (saturated water vapor) and kaolinite-diiodomethane drop-air systems. From the results and using a modified Young equation, the dispersion and nondispersion components of the free energy of the kaolinite hydrated surface were determined. The dispersion component of all the tested samples was between 32.8 and 38.9 mJ/m2, but the nondispersion component changed almost linearly from 53 to 95.9 mJ/m2 with the change of the entropy of hydration of the adsorbed ions, except for K+ and Ba2+. The latter ions were exceptions, probably due to their large ionic radii.

Type
Research Article
Copyright
Copyright © 1989, The Clay Minerals Society

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