Dresden 2017 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 53: Posters - Active Matter

DY 53.9: Poster

Donnerstag, 23. März 2017, 17:00–19:30, P1A

BD-Simulations on interfacially trapped active particles with long-ranged capillary interactions — •Jonathan Funk, Johannes Bleibel, and Martin Oettel — Institut für Angewandte Physik, Universität Tübingen, Deutschland

We study the dynamics of micron-sized colloidal particles trapped at a fluid interface. The particles deform the surface due to an external force (e.g. gravity), giving rise to long-ranged capillary interactions. Additionally the particles are self-propelled, with a constant velocity and changing direction due to rotational diffusion. In systems with a packing fraction (Φ>0.3) the active particles self-assemble in clusters even without an attractive potential by simply blocking each others motion. In systems with capillary interaction the ratio between the capillary force and an effective temperature is the determining factor for the clustering behavior. We study the movement in this capillary systems with lower densities, especially the active clustering effect and the diffusive characteristic of the active particles. Important observables of the system are the density distribution, the evolution of the Fourier modes of the density distribution, the average swimming speed and the persistence length of the active motion. With this observables, we can evaluate the phase behavior of the systems and establish a phase diagram.