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

    Fingerprint

    Electrohydrodynamics
    electrohydrodynamics
    colloids
    Suspensions
    electrokinetics
    Fluids
    fluids
    binary fluids
    Electrophoretic mobility
    simulation
    Boltzmann equation
    Colloids
    pseudopotentials
    fluid flow
    Flow of fluids
    solutes
    Hydrodynamics
    hydrodynamics
    Boundary conditions
    Ions

    Keywords

    • Condensed Matter - Soft Condensed Matter

    Cite this

    Rivas, Nicolas ; Frijters, Stefan ; Pagonabarraga, Ignacio ; Harting, Jens. / Mesoscopic electrohydrodynamic simulations of binary colloidal suspensions. In: Journal of Chemical Physics. 2018 ; Vol. 148, No. 14. pp. 1-14.
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    Mesoscopic electrohydrodynamic simulations of binary colloidal suspensions. / Rivas, Nicolas; Frijters, Stefan; Pagonabarraga, Ignacio; Harting, Jens.

    In: Journal of Chemical Physics, Vol. 148, No. 14, 144101, 14.04.2018, p. 1-14.

    Research output: Contribution to journalArticleAcademicpeer-review

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    AU - Rivas, Nicolas

    AU - Frijters, Stefan

    AU - Pagonabarraga, Ignacio

    AU - Harting, Jens

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    AB - 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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