"Slip, ypsotaxis, and synchronization of catalytically self-propelled particles"

Daniela Kraft
Leiden University, The Netherlands

Abstract

Synthetic microswimmers constitute a new class of nonequilibrium model systems that hold great promise for applications and understanding the behavior of biological microswimmers. A simple experimental realization of such microswimmers are spheres half coated with platinum, that propel themselves autonomously in the presence of hydrogen peroxide. These synthetic swimmers have a strong affinity for surfaces, but little is known about how surfaces affect their behavior. In this talk, I will demonstrate that the choice of the substrate material has a strong influence on the microswimmer speed through slippage [1]. Then, using a new height analysis approach, I will show that the microswimmer-wall separation is surprisingly robust for a range of salt concentrations, swimmer surface charges, and swimmer sizes [2]. Finally, we find that swimmers speed up and synchronize when they move at close distances . These striking, activity-induced findings have furthermore important implications for the still-debated propulsion mechanism. 

References

[1] Ketzetzi, de Graaf, Doherty, Kraft, PRL 124, 048002 (2020)

[2] Ketzetzi, de Graaf, Kraft, PRL (accepted, 2020) & arXiv 2006.06384 [cond-mat.soft]
 

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