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Issue 33, 2014
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Hydrodynamic simulations of self-phoretic microswimmers

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Abstract

A mesoscopic hydrodynamic model to simulate synthetic self-propelled Janus particles which is thermophoretically or diffusiophoretically driven is here developed. We first propose a model for a passive colloidal sphere which reproduces the correct rotational dynamics together with strong phoretic effect. This colloid solution model employs a multiparticle collision dynamics description of the solvent, and combines stick boundary conditions with colloid–solvent potential interactions. Asymmetric and specific colloidal surface is introduced to produce the properties of self-phoretic Janus particles. A comparative study of Janus and microdimer phoretic swimmers is performed in terms of their swimming velocities and induced flow behavior. Self-phoretic microdimers display long range hydrodynamic interactions with a decay of 1/r2, which is similar to the decay of gradient fields generated by self-phoretic particle, and can be characterized as pullers or pushers. In contrast, Janus particles are characterized by short range hydrodynamic interactions with a decay of 1/r3 and behave as neutral swimmers.

Graphical abstract: Hydrodynamic simulations of self-phoretic microswimmers

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Publication details

The article was received on 21 Mar 2014, accepted on 15 Jun 2014 and first published on 19 Jun 2014


Article type: Paper
DOI: 10.1039/C4SM00621F
Soft Matter, 2014,10, 6208-6218

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    Hydrodynamic simulations of self-phoretic microswimmers

    M. Yang, A. Wysocki and M. Ripoll, Soft Matter, 2014, 10, 6208
    DOI: 10.1039/C4SM00621F

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