How walls affect the dynamics of self-phoretic microswimmers

Yahaya Ibrahim, Tanniemola Liverpool*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

11 Citations (Scopus)
291 Downloads (Pure)

Abstract

We study the effect of a nearby planar wall on the propulsion of a spherical phoretic micro-swimmer driven by reactions on its surface. An asymmetric coverage of catalysts on its surface which absorb reactants and generate products gives rise to an anisotropic interfacial flow that propels the swimmer. We analyse the near-wall dynamics of such a self-phoretic swimmer as a function of the asymmetric catalytic coverage of the surface. By an analysis of the fundamental singularities of the flow and concentration or electrostatic potential gradients generated we are able to obtain and rationalise a phase diagram of behaviours as a function of the characteristics of the swimmer surface. We find a variety of possible behaviours, from “bound states” where the swimmer remains near the wall to “scattering” or repulsive trajectories in which the swimmer ends far from the wall. The formation of some of the bound states is a purely wall-phoretic effect and cannot be obtained by simply mapping a phoretic swimmer to a hydrodynamic one.
Original languageEnglish
Pages (from-to)1843-1874
Number of pages32
JournalEuropean Physical Journal: Special Topics
Volume225
Issue number8-9
Early online date10 Oct 2016
DOIs
Publication statusPublished - Oct 2016

Bibliographical note

Special issue: Modern Simulation Approaches in Soft Matter Science: From Fundamental Understanding to Industrial Applications

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