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Importance of depletion interactions for structure and dynamics of ferrofluids

Ilg, P.

In: The European Physical Journal E, 2008, vol. 26, no. 1-2, p. 169-176

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    Titre
    • Importance of depletion interactions for structure and dynamics of ferrofluids
    Auteur
    • Ilg, P.. Department of Materials, Polymer Physics, HCI H541, ETH Zürich, CH-8093, Zürich, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • The European Physical Journal E, 2008, vol. 26, no. 1-2, p. 169-176. Società Italiana di Fisica
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:320847
    Summary
    Abstract.: The influence of attractive depletion forces on the structure and dynamics of ferrofluids is studied by computer simulations. In the presence of a magnetic field, we find that sufficiently strong depletion forces lead to an assembly of particle chains into columnar structures with hexagonal ordering inside the columns. In a planar shear flow, this ordering is destroyed, leading to strong shear thinning behavior. A pronounced anisotropy of the shear viscosity is observed. The viscosity is found to be largest when the magnetic field is oriented in the gradient direction of the flow