Regensburg 2016 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 35: Active Matter (joint session DY/BP)
DY 35.9: Vortrag
Mittwoch, 9. März 2016, 12:00–12:15, H46
Comparison of external control strategies for optimized payload delivery — •Tobias Bäuerle1, Jakob Steiner1, Lena Bremicker2, Daniel Häufle2, and Clemens Bechinger1 — 12. Physikalisches Institut, Universität Stuttgart, 70569 Stuttgart, Germany — 2Institut für Sport- und Bewegungswissenschaft, Universität Stuttgart, 70569 Stuttgart, Germany
Synthetic microswimmers, i.e. self-propelled particles, constitute an interesting class of non-equilibrium systems which exhibit structural and dynamical features similar to those observed in assemblies of motile organisms like bacteria or cells. In addition, they may find applications as microrobots which will deliver payloads to specific sites in liquid environments.
In our studies, we addressed the question how the delivery process can be optimized by the choice of the control strategy. Experimentally, this was achieved by light-activated microswimmers, where the propulsion velocity was controlled by the light intensity. Depending on the particle orientation and its distance from the target, the illumination was turned on and off, resulting in an intermittent change between Brownian and active motion. Even for slight variations of control strategies, we find large changes e.g. in the ratio of the delivery time and the total propulsion energy. Our results are in excellent agreement with numerical simulations.