Regensburg 2025 – scientific programme

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BP: Fachverband Biologische Physik

BP 28: Microswimmers and Microfluidics (joint session DY/BP/CPP)

BP 28.1: Invited Talk

Thursday, March 20, 2025, 15:00–15:30, H37

Light-Driven Manipulation of Passive and Active Microparticles — •Svetlana Santer — Institute of Physics and Astronomy, University of Potsdam, Germany

Chemical gradient near a solid/liquid can result in lateral long-range fluid transport termed diffusioosmotic (DO) flow. For instance, when photosensitive surfactant is irradiated with light converting the majority of the molecules in one of the possible isomers, emerging concentration gradient of isomers generates an osmotic pressure gradient tangent to the wall actuating the surrounding liquid to flow. [1-3] In my talk I will show how one can manipulate microparticles and even induce their self-propulsion by light urtilizing light driven diffusioosmotic (LDDO) phenomenon. Depending on the applied wave length one can either disperse/remove or gather particles. We will discuss how to establish light-driven hydrodynamics as a useful and versatile tool for investigating collective motion of self-propelled particles and aggregation

[1] Feldmann, D.; Maduar S.R.; Santer, M.; Lomadze, N.; Vinogradova O.I.; Santer, S. Scientific Reports, 6 (2016) 36443. [2] Santer, S. J. Phys. D: Applied Physics, 51 (2017) 013002. [3] Arya, P.; Umlandt, M.; Jelken, J.; Feldmann, D.; Lomadze, N.; Asmolov , E. S.; Vinogradova, O. I.; Santer, S. A. The European Physical Journal E, 44(50) (2021), 1-10.

Keywords: diffusioosmosis, diffusiophoresis; particle manipulation; photoresponsive surfactants; self-propulsion; active colloids