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Lyotropic effect in surface charge, electrokinetics, and coagulation of a rutile dispersion

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Abstract

Potentiometric, electrokinetic, and coagulation experiments with a rutile dispersion in the pH region above the point of zero charge exhibit an “inverse” lyotropic sequence for counterions: Li+>K+>Cs+. The potentiometric and electrokinetic data were interpreted by a surface complexation model assuming the Stern-Gouy-Chapman structure of the interfacial layer, which yielded the values of inner layer capacitances,C, and the intrinsic equilibrium constants,K 0ass , characterizing the specificity of each counterion. These parameters were used to explain the order of lyotropic sequences in the adsorption, coagulation, and electrokinetic phenomena.

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Author notes

  1. E. Matijević

    Present address: Center for Advanced Materials Processing, Clarkson University, Box 5814, 13699-5814, Potsdam, New York, USA

Authors and Affiliations

  1. Laboratory of Physical Chemistry, Faculty of Science, University of Zagreb, Zagreb, Croatia

    N. Kallay

  2. Department of Materials Science and Mineral Engineering, University of California, Berkeley, California, USA

    M. Čolić, D. W. Fuerstenau & H. M. Jang

Authors
  1. N. Kallay
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  2. M. Čolić
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  3. D. W. Fuerstenau
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  4. H. M. Jang
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  5. E. Matijević
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Kallay, N., Čolić, M., Fuerstenau, D.W. et al. Lyotropic effect in surface charge, electrokinetics, and coagulation of a rutile dispersion. Colloid Polym Sci 272, 554–561 (1994). https://doi.org/10.1007/BF00653221

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  • DOI: https://doi.org/10.1007/BF00653221

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