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Hydrodynamic simulations of self-phoretic microswimmers.

Authors
  • Yang, Mingcheng1
  • Wysocki, Adam
  • Ripoll, Marisol
Type
Published Article
Journal
Soft Matter
Publisher
The Royal Society of Chemistry
Publication Date
Sep 07, 2014
Volume
10
Issue
33
Pages
6208–6218
Identifiers
DOI: 10.1039/c4sm00621f
PMID: 25012361
Source
Medline
License
Unknown

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/r(2), 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/r(3) and behave as neutral swimmers.

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