Mesoscopic electrohydrodynamic simulations of binary colloidal suspensions

Nicolas Rivas, Stefan Frijters, Ignacio Pagonabarraga, Jens Harting

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)
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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.

Original languageEnglish
Article number144101
Pages (from-to)1-14
JournalJournal of Chemical Physics
Volume148
Issue number14
DOIs
Publication statusPublished - 14 Apr 2018

Keywords

  • Condensed Matter - Soft Condensed Matter

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