Confinement effects on diffusiophoretic self-propellers

Physics – Condensed Matter – Soft Condensed Matter

Scientific paper

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18 pages, 4 figures, J. Chem. Phys. (in print; full bibliographic info and DOI to be added once available)

Scientific paper

10.1063/1.3133239

We study theoretically the effects of spatial confinement on the phoretic motion of a dissolved particle driven by composition gradients generated by chemical reactions of its solvent, which are active only on certain parts of the particle surface. We show that the presence of confining walls increases in a similar way both the composition gradients and the viscous friction, and the overall result of these competing effects is an increase in the phoretic velocity of the particle. For the case of steric repulsion only between the particle and the product molecules of the chemical reactions, the absolute value of the velocity remains nonetheless rather small.

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