Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 64: Poster: Active Matter and Microswimmers (joint session DY/TT)

TT 64.1: Poster

Donnerstag, 19. März 2020, 15:00–18:00, P1A

Colloidal rods with visual perception: a simple cone of sight model. — •Anton Lüders, Philipp Stengele, and Peter Nielaba — Universität Konstanz, Konstanz, Deutschland

We introduce a simple model system of two-dimensional colloidal spherocylinders which become self-propelled under visual stimuli triggered by their neighboring particles. Via conventional Brownian dynamics simulations, the clustering phenomena and the collective motion in systems of multiple colloidal rods with visual perception are analyzed. In our model system, every particle is linked to a predefined cone of sight. A specific particle moves according to active Brownian motion if there is another particle's center inside the corresponding cone of sight but fluctuates according to normal passive Brownian motion otherwise. By analyzing the clustering phenomena of large systems we find a regime dominated by a clustering mechanism characteristic for the rods with visual perception in the range of small number densities. This regime leads to an unusual enhancement of the mean cluster size by reducing the number density of the system. Furthermore, it is studied how a small number of grouped spherocylinders with visual perception spread inside an infinite system. We find that the dynamics of rods inside this system is based on metastable states of passive Brownian motion and small flocks of activated particles. The dynamics of the particles inside the infinite system is further compared to more complex model systems of colloidal spherocylinders with visual perception.