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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 85: Focus: Polymers under confinement I

CPP 85.6: Hauptvortrag

Donnerstag, 19. März 2020, 11:30–12:00, ZEU 222

Nonequilibrium Properties of Polymers in Confinement — •Roland G. Winkler — Theoretical Soft Matter and Biophysics, Institute for Advanced Simulation, Forschungszentrum Jülich, 52428 Jülich

The interplay between polymer conformational degrees of freedom, confinement, and nonequilibrium forces results in intriguing structural and dynamical properties [1]. The out-of-equilibrium state can either be achieved by well established external fields, such as electric, magnetic, and flow fields, or by active forces, as for polar filaments of the cytoskeleton of a cell. Moreover, in living cells, nonthermal fluctuations (colored noise), induced by ATP-powered enzymes, are expected to play a major role in DNA organization and for the dynamics of the chromatin in the nucleus. The novel emerging phenomena of active soft matter render them a promising class of new materials [2]. We studied the properties of soft colloids, like linear polymers and star polymers under flow, specifically the interplay between flow, polymer conformations, and hydrodynamic interactions. In particular, we find that the latter strongly affect the properties of polymers in a channel [3]. For "active" polymers, we find that their internal degrees of freedom strongly affect the conformations, and in particular, the phase behavior. [1] R. G. Winkler, D. A. Fedosov, G. Gompper, Curr. Opin. Colloid Interface Sci. 19, 594 (2014) [2] R. G. Winkler, J. Elgeti, G. Gompper, J. Phys. Soc. Jpn. 86, 101014 (2017) [3] R. Chelakkot, R. G. Winkler, G. Gompper, EPL 91, 14001 (2010)