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Effect of ionic van der Waals forces on the diffuse potential of model colloids

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Abstract

In this work, the role of ionic dispersion forces in specific ion effects is evaluated through Monte Carlo simulations in the primitive model. More specifically, we assess the effect of such forces on the diffuse potential, since this property is essential to understand the electrokinetic behavior of colloids. In this way, ion specificity arises naturally since ion dispersion forces depend on ionic polarizability, which differs for ions with the same valence. This property is included in the primitive model by means of the Lifshitz theory. The results for different ions are summarized with the help of a nondimensional parameter characterizing the relative weight of ionic van der Waals interactions. Our data reveal that for small ions with high polarizability the ionic dispersion forces can considerably contribute to the specificity of the diffuse potential. In any case, the specific ion effects due to ion polarizability are strongly influenced by ion size.

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Acknowledgments

The authors are grateful to “Ministerio de Educación y Ciencia, Plan Nacional de Investigación, Desarrollo e Innovación Tecnológica (I + D + i),” project MAT2009-13155-C04-04, “Consejería de Innovación, Ciencia y Empresa de la Junta de Andalucía” projects P07-FQM-02496, P07-FQM-02517, and FQM-4698, as well as the European Regional Development Fund for financial support. A.M.-M. also thanks the “Programa Ramón y Cajal, 2005, Ministerio de Educación y Ciencia–Fondo Social Europeo (RYC-2005-000829).”

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Authors and Affiliations

  1. Departamento de Física, Escuela Politécnica Superior de Linares, Universidad de Jaén, 23700, Linares, Jaén, Spain

    Manuel Quesada-Pérez

  2. Grupo de Física de Fluidos y Biocoloides, Facultad de Ciencias, Universidad de Granada, Campus de Fuentenueva, sn, 18071, Granada, Spain

    Roque Hidalgo-Álvarez & Alberto Martín-Molina

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  1. Manuel Quesada-Pérez
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  2. Roque Hidalgo-Álvarez
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  3. Alberto Martín-Molina
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Correspondence to Manuel Quesada-Pérez.

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Quesada-Pérez, M., Hidalgo-Álvarez, R. & Martín-Molina, A. Effect of ionic van der Waals forces on the diffuse potential of model colloids. Colloid Polym Sci 288, 151–158 (2010). https://doi.org/10.1007/s00396-009-2139-4

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  • DOI: https://doi.org/10.1007/s00396-009-2139-4

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