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Catalytic colloidal swimmers that propel due to self-generated fluid flowsexhibit strong affinity for surfaces. We here report experimental measurementsof significantly different velocities of such microswimmers in the vicinity ofsubstrates made from different materials. We find that velocities scale withthe solution contact angle $\theta$ on the substrate, which in turn relates tothe associated hydrodynamic substrate slip length, as$V\propto(\cos\theta+1)^{-3/2}$. We show that such dependence can be attributedto osmotic coupling between swimmers and substrate. Our work points out thathydrodynamic slip at the wall, though often unconsidered, can significantlyimpact the self-propulsion of catalytic swimmers.

Slip length dependent propulsion speed of catalytic colloidal swimmers near walls