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Precipitation of surfactant salts III. Metal perfluoroalkanecarboxylates

  • Colloid Science
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Abstract

Precipitation of perfluorocarboxylic acids (n-C3H7OOH, n-C7H15COOH, and n-C9F19COOH) in aqueous solutions of different metal nitrates (K+, Ag+, Ca2+, Ba2+, Zn2+, Al3+, La3+) was studied by solubility and calorimetric measurements. The free energy of precipitation per single surfactant chain was found to depend on the chain length but not on the charge of the reacting cation. It was shown that the precipitation of perfluorocarboxylates of multivalent cations was governed by positive entropy change and a low enthalpic contribution, whereas the soaps of monovalent cations exhibited the opposite behavior. The entropy of precipitation was not affected by the chain length of the surfactants in the presence of monovalent cations, but it increased for cations of higher charge.

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Author notes

  1. E. Matijević

    Present address: Department of Chemistry, Clarkson University Potsdam, New York, USA

Authors and Affiliations

  1. Department of Chemistry, Clarkson University Potsdam, New York, USA

    X. -J. Fan, M. Čolić & N. Kalky

  2. Laboratory of Physical Chemistry, Faculty of Science, University of Zagreb, Zagreb, Yugoslavia

    M. Čolić & N. Kalky

Authors
  1. X. -J. Fan
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  2. M. Čolić
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  3. N. Kalky
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  4. E. Matijević
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Additional information

This paper is dedicated to Professor Armin Weiss on the occasion of his 60th birthday. One of the authors (E. M.) particularly appreciates many years of cooperation with Professor Weiss in editing Colloid and Polymer Science, as well as in many other scientific interactions.

Supported by the NSF Grant CHE-8619509.

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Fan, X.J., Čolić, M., Kalky, N. et al. Precipitation of surfactant salts III. Metal perfluoroalkanecarboxylates. Colloid & Polymer Sci 266, 380–384 (1988). https://doi.org/10.1007/BF01451823

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  • DOI: https://doi.org/10.1007/BF01451823

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