Hydrodynamic simulations of self-phoretic microswimmers

Yang, Mingcheng; Ripoll, Marisol; Wysocki, Adam

doi:10.1039/C4SM00621F

Journal Article

FZJ-2014-04103

Hydrodynamic simulations of self-phoretic microswimmers

Yang, M. (Corresponding Author) ; Wysocki, A.FZJ* ; Ripoll, M.FZJ*

2014
Royal Society of Chemistry (RSC) Cambridge

Soft matter 10(33), 6208 - (2014) [10.1039/C4SM00621F]

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Please use a persistent id in citations: http://hdl.handle.net/2128/22854 doi:10.1039/C4SM00621F

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.

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