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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 50: Poster Session III

CPP 50.9: Poster

Dienstag, 17. März 2020, 14:00–16:00, P1C

Translational and rotational dynamics of anisotropic colloids — •Lisa Rohde, Manuel A. Escobedo-Sanchez, Juan Pablo Segovia-Gutierrez, and Stefan U. Egelhaaf — Condensed Matter Physics Laboratory, Heinrich Heine University, Düsseldorf, Germany

Micron-sized colloids show many physical phenomena, also encountered in more complex environments. In contrast to molecular systems, they are experimentally more accessible due to their larger size and slower dynamics. For example, they can be observed by optical microscopy. This renders them powerful model systems. While spherical particles have been used in many studies, the interest now moves to more complex structures. Here, we present experiments with ‘colloidal molecules’, namely trimers formed by three fused spherical particles[1]. The dynamics of spherical particles has been investigated in dependence of the particle concentration[2]. With increasing concentration, the dynamics slows down and eventually dynamical arrest is observed. A non-spherical shape introduces more complex dynamics with translation and rotation. In our experiments, the particles are in quasi-2D confinement resulting in translational motion as well as rotation around (only) one axis. The dynamics of pure trimers as well as the dynamics of trimers in the presence of spherical particles are investigated. The translational and rotational motions are quantitatively studied using microscopy and particle tracking.

[1]Manoharan et al.,Science,301,483-487,2003. [2]Pusey:Liquids,Freezing and Glass Transition,Elsevier p.763-942,1991.