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SYBS: Symposium Physics of Biological and Synthetic Active Matter

SYBS 1: Physics of Biological and Synthetic Active Matter

SYBS 1.4: Hauptvortrag

Dienstag, 13. März 2018, 11:15–11:45, H 0105

Suspensions of active colloids — •Cecile Cottin-Bizonne, Félix Ginot, Isaac Theurkauff, and Christophe Ybert — Institut Lumière Matière, Université Lyon 1, France

We experimentally explore the behavior of active suspensions of self propelled colloids. At intermediate densities we observe the formation of clusters, resulting from a permanent dynamical merging and separation of active colloids. We have characterized in depth their kinetics of formation and their dynamics which shows vivid translational and rotational motions. These experimental results are discussed in the framework of a simple statistical model that captures quantitatively the measured dynamics. This sheds some new light on the internal organization of the clusters and on the mechanisms underlying their formation. Looking further at the sedimentation profile of the active particles we derive non-equilibrium equation of state of our system. Finally in the dense regime we a observe an unexpected non-monotonic behavior of the particles with activity.