Self-diffusiophoresis of Janus particles in near-critical mixtures

Abstract

We theoretically study the self-propulsion of a laser-heated Janus particle in a near critical waterlutidine mixture, and relate its velocity vp and squirmer parameter \b{eta} to the wetting properties of its two hemispheres. For non-ionic surface forces, the particle moves the active cap ahead, except at strong driving, where a more complex behavior occurs if one of the hemispheres attracts water and the other lutidine. Both vp and \b{eta} show non-monotonic dependencies on the heating power, and may even change sign. Including the drift of the counterions due to the composition gradient, we find that a charged cap with lutidine affinity drives the particle the cap ahead, and with water affinity in the opposite direction, in agreement with experimental findings.

5 pages, 5 figures, includes supplementary material

References in corpus (5)

• Self-motile colloidal particles: from directed propulsion to random walk
• Locomotion of Electrocatalytic Nanomotors due to Reaction Induced Charge Auto-Electrophoresis
• Flow pattern in the vicinity of self-propelling hot Janus particles
• Specific Salt Effects on Thermophoresis of Charged Colloids
• Self-propulsion mechanism of active Janus particles in near-critical binary mixtures

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