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Issue 48, 2017
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Nonequilibrium depletion interactions in active microrheology

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Entropic depletion forces arise between mesoscopic bodies that are immersed in a suspension of macromolecules, such as colloid–polymer mixtures. Here we consider the case of a driven colloidal probe in the presence of another, passive colloidal particle, both solvated in an ideal bath of small spherical particles. We calculate the nonequilibrium forces mediated by the depletants on the two colloidal particles within a dynamical superposition approximation (DSA) scheme. In order to assess the quality of this approximation, and to obtain the colloidal microstructure around the driven probe, we corroborate our theoretical results with Brownian dynamics simulations.

Graphical abstract: Nonequilibrium depletion interactions in active microrheology

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Publication details

The article was received on 28 Aug 2017, accepted on 06 Oct 2017 and first published on 19 Oct 2017

Article type: Paper
DOI: 10.1039/C7SM01737E
Citation: Soft Matter, 2017,13, 9093-9102

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    Nonequilibrium depletion interactions in active microrheology

    R. Wulfert, U. Seifert and T. Speck, Soft Matter, 2017, 13, 9093
    DOI: 10.1039/C7SM01737E

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