Molecular dynamics simulations of phase separation in the presence of surfactants

Mohamed Laradji, Ole G. Mouritsen, Søren Toxvaerd, Martin J. Zuckermann

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    Abstract

    The dynamics of phase separation in two-dimensional binary mixtures diluted by surfactants is studied by means of molecular dynamics simulations. In contrast to pure binary systems, characterized by an algebraic time dependence of the average domain size, we find that systems containing surfactants exhibit nonalgebraic, slow dynamics. The average domain size eventually saturates at a value inversely proportional to the surfactant concentration. We also find that phase separation in systems with different surfactant concentrations follow a crossover scaling form. Finally, although these systems do not fully phase separate, we observe a dynamical scaling which is independent of the surfactant concentration. The results of these simulations are in general in agreement with previous Langevin simulations [Laradji, Guo, Grant, and Zuckermann, J. Phys. A 44, L629 (1991)] and a theory of Ostwald ripening [Yao and Laradji, Phys. Rev. E 47, 2695 (1993)].
    Original languageEnglish
    JournalPhysical Review E. Statistical, Nonlinear, and Soft Matter Physics
    Volume50
    Issue number2
    Pages (from-to)1243-1252
    ISSN1063-651X
    DOIs
    Publication statusPublished - 1994

    Bibliographical note

    Copyright (1994) by the American Physical Society.

    Keywords

    • BINARY-FLUID MIXTURE
    • FIELD ISING-MODEL;
    • LATTICE MODEL
    • DOMAIN-GROWTH KINETICS
    • SPINODAL DECOMPOSITION

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