Department of Physics, Engineering Physics & Astronomy

Department of Physics, Engineering Physics & Astronomy
Department of Physics, Engineering Physics & Astronomy

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

 

Daniela Kraft,
Leiden University,
The Netherlands.

Date: Friday October 23rd, 2020
Time: 1:30 P.M
Location: Zoom

 

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]
 

Topic: Colloquium: Daniela Kraft

Time: Oct 23, 2020 01:30 PM America/Toronto

 

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