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Title: Mesoscopic electrohydrodynamic simulations of binary colloidal suspensions
Author: Rivas, Nicolas
Frijters, Stefan
Pagonabarraga Mora, Ignacio
Harting, Jens
Keywords: Fenòmens mesoscòpics (Física)
Mesoscopic phenomena (Physics)
Issue Date: 9-Apr-2018
Publisher: American Institute of Physics
Abstract: A model is presented for the solution of electrokinetic phenomena of colloidal suspensions in fluid mixtures.We solve the discrete Boltzmann equation with a Bhatnagar-Gross-Krook collision operator using the lattice Boltzmann method to simulate binary fluid flows. Solvent-solvent and solvent-solute interactions are implemented using a pseudopotential model. The Nernst-Planck equation, describing the kinetics of dissolved ion species, is solved using a finite difference discretization based on the link-flux method. The colloids are resolved on the lattice and coupled to the hydrodynamics and electrokinetics through appropriate boundary conditions. We present the first full integration of these three elements. The model is validated by comparing with known analytic solutions of ionic distributions at fluid interfaces, dielectric droplet deformations, and the electrophoretic mobility of colloidal suspensions. Its possibilities are explored by considering various physical systems, such as breakup of charged and neutral droplets and colloidal dynamics at either planar or spherical fluid interfaces.
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It is part of: Journal of Chemical Physics, 2018, vol. 148, p. 144101
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ISSN: 0021-9606
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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