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Issue 21, 2010
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Heterogeneity of the electrostatic repulsion between colloids at the oil–water interface

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Abstract

The pairwise and multi-body interaction forces between polystyrene particles at an oil–water interface are measured. The electrostatic repulsive force has the expected dependence on particle separation for a dipole–dipole interaction, Frepr−4, but exhibits a distribution of magnitudes in which the force depends on the particle pairs tested and sample preparation method. A gamma distribution accurately models this variation in the repulsion between pairs of particles. Despite this heterogeneity, the multibody interactions measured in small ensembles are pairwise additive. Good agreement is found for the two-dimensional equilibrium suspension structure between experiments and Monte Carlo simulations when a heterogeneous interaction potential is implemented in the latter. The heterogeneity and long-range of the repulsive interaction accounts for the lower apparent pair interaction potential derived from the suspension radial distribution function at dilute, but finite, surface concentrations when compared to the direct pair interaction measurements made with laser tweezers at nearly infinite dilution.

Graphical abstract: Heterogeneity of the electrostatic repulsion between colloids at the oil–water interface

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Publication details

The article was received on 08 Jun 2010, accepted on 14 Aug 2010 and first published on 17 Sep 2010


Article type: Paper
DOI: 10.1039/C0SM00485E
Citation: Soft Matter, 2010,6, 5327-5333
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    Heterogeneity of the electrostatic repulsion between colloids at the oil–water interface

    B. J. Park, J. Vermant and E. M. Furst, Soft Matter, 2010, 6, 5327
    DOI: 10.1039/C0SM00485E

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