Nonlinear electrophoresis in the presence of dielectric decrement

Abstract : The nonlinear phenomena that occur in the electric double layer (EDL) that forms at charged surfaces strongly influence electrokinetic effects, including electro-osmosis and electrophoresis. In particular, saturation effects due to either dielectric decrement or ion crowding effects are of paramount importance. Dielectric decrement significantly influences the ionic concentration in the EDL at high ζ potential, leading to the formation of a condensed layer near the particle's surface. In this article, we present a model incorporating both steric effects due to the finite size of ions and dielectric decrement to describe the physics in the electric double layer. The model remains valid in both weakly and strongly nonlinear regimes, as long as the electric double layer remains in quasiequilibrium. We apply this model to the study of two archetypal problems in electrokinetics, namely the electrophoresis of particles with fixed surface charges and the electrophoresis of ideally polarizable particles.
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Article dans une revue
Physical Review E , American Physical Society (APS), 2016, 94 (2), <10.1103/PhysRevE.94.023115>
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https://hal.archives-ouvertes.fr/hal-01431759
Contributeur : Bruno Figliuzzi <>
Soumis le : mercredi 11 janvier 2017 - 11:20:59
Dernière modification le : mardi 12 septembre 2017 - 11:41:10

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Bruno Figliuzzi, W. H. R. Chan, C. R. Buie, J. L. Moran. Nonlinear electrophoresis in the presence of dielectric decrement. Physical Review E , American Physical Society (APS), 2016, 94 (2), <10.1103/PhysRevE.94.023115>. <hal-01431759>

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