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We study the forces and torques experienced by pill-shaped Janus particles ofdifferent aspect ratios where half of the surface obeys the no-slip boundarycondition and the other half obeys the Navier slip condition of varying sliplengths. Using a recently developed boundary integral formulation whereby thetraditional singular behaviour of this approach is removed analytically, wequantify the strength of the forces and torques experienced by such particlesin a uniform flow field in the Stokes regime. Depending on the aspect ratio andthe slip length, the force transverse to the flow direction can change sign.This is a novel property unique to the Janus nature of the particles.

Stokesian dynamics of pill-shaped Janus particles with stick and slip boundary conditions