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• W3136136076 abstract "Selective heating of a microparticle surface had been observed to cause its autonomous movement in a fluid medium due to self-generated temperature gradients. In this work, we theoretically investigate the response of such an auto-thermophoretic particle near a planar wall which is held isothermal. We derive an exact solution of the energy equation and employ the Reynolds reciprocal theorem to obtain the translational and rotational swimming velocities in the creeping flow limit. Subsequently, we analyse the trajectories of the micromotor for different thermo-physical and configurational parameters. Results show that the micromotor trajectories can be switched either from wall-bound sliding or stationary state to escape from the near-wall zone by suitably choosing the particle and the surrounding fluid pair having selective thermal conductivity contrasts. Further, we discuss the dependency of this swimming-state transition on the launching orientation and the coverage of the metallic cap. Our results reveal that the scenario addressed here holds several exclusive distinguishing features from the otherwise extensively studied self-diffusiophoresis phenomenon near an inert wall, despite obvious analogies in the respective constitutive laws relating the fluxes with the gradients of the concerned forcing parameters. The most contrasting locomotion behaviour here turns out to be the ability of a self-thermophoretic micromotor to migrate towards the wall with large heated cap even if it is initially directed away from the wall. Besides, during the stationary state of swimming, the cold portion on the micromotor surface faces away from the wall, under all conditions. Such unique aspects of locomotion hold the potential of being harnessed in practice towards achieving intricate control over autonomous motion of microparticles in thermally-regulated fluidic environments." @default.
• W3136136076 created "2021-03-29" @default.
• W3136136076 creator A5010328668 @default.
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• W3136136076 date "2021-03-11" @default.
• W3136136076 modified "2023-09-27" @default.
• W3136136076 title "Steering a thermally activated micromotor with a nearby isothermal wall" @default.
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• W3136136076 doi "https://doi.org/10.1017/jfm.2021.27" @default.
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