The dynamics of a self-phoretic Janus swimmer near a wall

Abstract

We study the effect of a nearby planar wall on the propulsion of a phoretic Janus micro-swimmer driven by asymmetric reactions on its surface which absorb reactants and generate products. We show that the behaviour of these swimmers near a wall can be classified $\mathbf{based}\mathbf{on}\mathbf{whether}$ the swimmers are $\mathbf{mainly}$ absorbing or producing reaction solutes $\mathbf{and}\mathbf{whether}$ their swimming directions are such that the inert or active face is at the front. We find that the wall-induced solute gradients always promote swimmer propulsion along the wall while the effect of hydrodynamics leads to re-orientation of the swimming direction away from the wall.

6 pages, 6 figures

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