Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session S40: DFD VII
8:00 AM–10:12 AM,
Thursday, March 7, 2024
Room: 103F
Sponsoring
Unit:
DFD
Chair: Sangwoo Shin, University at Buffalo, The State University of New York
Abstract: S40.00002 : Light-adaptive motility in self-propelled microswimmers*
8:12 AM–8:24 AM
Presenter:
Ueli Töpfer
(ETH Zurich)
Authors:
Ueli Töpfer
(ETH Zurich)
Federico Paratore
(ETH Zurich)
Lucio Isa
(ETH Zurich)
We developed microswimmers with an optically-controllable activity by fabricating silica Janus particles (JPs) with a photo-responsive titania hemisphere. Our JPs self-propel in response to an external AC electric field through electrohydrodynamic flows. Upon local illumination, the conductivity of the titania hemisphere increases, allowing for the adaptation of the propulsion velocity. We employ dynamic illumination landscapes that demonstrate a broad range of control schemes over the particles. We believe that this platform opens intriguing possibilities for the development of adaptive artificial microswimmers leading to interesting emergent behaviour.
*We thankfully acknowledge funding from the European Research Council (ERC) under the European Union's Horizon 2020 Research and Innovation Program, grant No.101001514
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