Regensburg 2022 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 46: Poster Session: Complex Fluids, Soft Matter, Active Matter, Glasses and Granular Materials

DY 46.11: Poster

Donnerstag, 8. September 2022, 15:00–18:00, P2

Collective Behaviour of Active Assemblies Induced by Internal Feedback — •Lisa Rohde and Frank Cichos — Molecular Nanophotonics Group, Peter Debye Institute for Soft Matter Physics, Leipzig University, Linnéstr. 5, 04103 Leipzig, Germany

Collective phenomena and self-organising processes in nature such as structure formation of cells or flocking of birds are generated by physical interactions between autonomous objects ruled by feedback, information processing or sensing. Recently there has been an increasing interest in studying the collective behaviour of artificial active particles that provide the basic functionality of self-propulsion on the microscale. Here, we introduce physical interactions between artificial microswimmers in a crowded environment by implementing feedback rules to mimic the self-organisation of their living counterparts. We use differently shaped Janus particles capped with a thin gold layer. They are driven by self-thermophoresis, which we control by heating the gold layer with a laser. Depending on the shape of the Janus particle we observe different clustering behaviour as a result of a positive feedback mechanism by which Janus particles are attracted due to a temperature increase of a growing cluster. Our system reacts on hydrodynamic flow fields that are internally induced by other components by showing for example, a polarised motion of particles when being subjected to the feedback loop. We investigate and quantify the role of shape dependent hydrodynamic flow fields on the feedback mechanism by dedicated experiments on the clustering of active assemblies.