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The force and torque on a Janus sphere moving in a rarefied gas with athermal gradient are calculated. The regime of large Knudsen number isconsidered, with the momenta of impinging gas molecules either obtained from aChapman-Enskog distribution or from a binary Maxwellian distribution betweentwo opposing parallel plates at different temperature. The reflectionproperties at the surface of the Janus particle are characterized byaccommodation coefficients having constant but dissimilar values on eachhemisphere. It is shown that the Janus particle preferentially orients suchthat the hemisphere with a larger accommodation coefficient points towards thelower temperature. The thermophoretic velocity of the particle is computed, andthe influence of the thermophoretic motion on the magnitude of the torqueresponsible for the particle orientation is studied. The analyticalcalculations are supported by Direct Simulation Monte Carlo results, extendingthe scope of the study towards smaller Knudsen numbers. The results shed lighton the efficiency of oriented deposition of nanoparticles from the gas phaseonto a cold surface.

Thermophoresis of Janus particles at large Knudsen numbers