SKM 2021 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 13: Molecular Electronics, Hybrid and Perovskite Photovoltaics
CPP 13.6: Invited Talk
Friday, October 1, 2021, 11:45–12:15, H3
Light-actuated colloidal nano- and microparticles — •Cornelia Denz1, Matthias Rueschenbaum1, Valeria Bobkova1, Julian Jeggle2, and Raphael Wittkowski2 — 1Institute of Applied Physics, University of Muenster — 2Institute of Theoretical Physics, University of Muenster
Propelled colloidal particles constitute biomimetic analogues to natural microswimmers and represent ideal agents for responsive and adaptive soft matter. Among the numerous propulsion mechanisms developed recently to self-propel such nano- and microparticles, light is a most promising stimulus, since it enables a natural spatio-temporal control of the motion, especially for large numbers of the particles, leading to swarming-like behaviour or novel active materials with exceptional properties.
We introduce on the one hand a novel class of such particles that are light-actuated based on symmetry-broken refraction, fabricated by 3d laser printing based on two-photon polymerization. By numerical simulations, we will discuss collective, light-actuated effects including unexpected patterns and transport effects.
On the other hand, we demonstrate that light actuation of a large number of colloidal particles in optical feedback leads to self-organized pattern formation including the superposition of symmetric patterns as hexagons, rolls and squares. We discuss the stability of these patterns and their control.