Berlin 2018 – scientific programme

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BP: Fachverband Biologische Physik

BP 15: Postersession III

BP 15.94: Poster

Tuesday, March 13, 2018, 14:00–16:00, Poster B

Creating Sensorial Delay to Simulate Phototaxis Using Thermophoresis Applied to Gold-coated Microswimmers — •Alexander Fischer¹, Giovanni Volpe², and Frank Cichos¹ — ¹Molecular Nanophotonics, Peter-Debye-Institute, Universität Leipzig — ²Department of Physics, University of Gothenburg

Sperm cells of marine invertebrates move towards the egg using chemotaxis. This task is rather challenging due to the noisy movement of the individuals (agents). The complex behavior of the agents can be simulated by using some simple rules. The autonomous agent performs directed motion in a plane and the orientation is subject to noise. The speed of the agent slows down in those regions where it measures a higher concentration of messengers. Thus, the probability of presence of the agent is higher in regions with higher concentration. According to Volpe et al. [1], a change between segregation and aggregation of the agents in the high messenger concentration regions can be achieved by introducing a delayed response to the messenger concentration. We implement this model by using gold-coated microparticles diluted in water. Here we explore this behavior in a system of active particles that are controlled remotely by a feedback loop.

[1] M. Mijalkov, A. McDaniel, J. Wehr, G. Volpe, Phys. Rev. X, 6, 011008 (2016)