Regensburg 2013 – wissenschaftliches Programm

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PV: Plenarvorträge

PV VII

PV VII: Plenarvortrag

Dienstag, 12. März 2013, 14:00–14:45, H15

Self-assembly, Self-organization and Control of Colloidal Suspensions — •Sabine H. L. Klapp — Institut für Theoretische Physik, Sekr. EW 7-1, Technische Universität Berlin, Hardenbergstrasse 36, D-10632 Berlin

For more than a century, colloidal suspensions have been appreciated as model systems of condensed-matter phenomena such as condensation, freezing and nucleation. Recently, the fundamental insights emerging from the study of colloids receive attention not only in physics, but also in materials science, chemistry and biology, main goals being the deliberate design of functional advanced materials and unraveling biological transport phenomena. Moreover, colloidal suspensions are increasingly used to explore non-equilibrium phenomena such as pattern formation and synchronization. In the present talk I will discuss recent theoretical and computer simulation studies in this area, considering a variety of colloidal systems which are either in thermal equilibrium or driven out of equilibrium by external fields. Starting from the ordering of charged colloids at interfaces, I will describe the rich manifold of phenomena encountered in magnetic colloids (ferrofluids), such as self-assembly into chains and anomalous diffusion in static magnetic fields, as well as self-organization in rotating fields. As a further example of non-equilibrium behavior I will consider shear-induced phenomena, focusing on recently discovered effects such as spontaneous dynamic polarization in polar nanorods and oscillating motion in shear-driven colloidal layers. Finally, I will discuss strategies to manipulate the dynamical behavior of colloidal systems by feedback control.