(221v) Non-Newtonian effects on the slip and mobility of a self-propelling active particle

Janus particles propel themselves by generating concentration gradients along their surface. This generates a flow near the surface, known as the diffusio-osmotic slip, which propels the particle without having to apply external concentration gradients. In this work, we study the influence of viscoelasticity and shear-thinning/thickening (modelled as the second-order-fluid and Carreau model, respectively) on the slip of a Janus particle. Using matched asymptotic expansions, we provide an analytical expression for the modification to slip induced by the non-Newtonian behaviour. Using the reciprocal theorem, we estimate the influence of this modification on the particle mobility. The current study also has implications on the understanding of the transport of complex fluids in diffusio-osmotic pumps.