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Dr. Kostas Daoulas Max Planck-Institut für Polymerforschung Ackermannweg 10 D-55128 Mainz Tel: +49 6131 379 218 Fax: :+49 6131 379340 Mail: kostas.daoulas@mpip-mainz.mpg.de Further information

Prof. Dr. Gregor Diezemann Department Chemie Johannes Gutenberg-Universität Mainz Duesbergweg 10-14 D-55128 Mainz Tel: +49 6131 39 23735 Mail: diezeman@uni-mainz.de Further information

Prof. Dr. Burkhard Dünweg Max Planck-Institut für Polymerforschung Ackermannweg 10 D-55128 Mainz Tel: +49 6131 379198 Mail: duenweg@mpip-mainz.mpg.de Further information

Prof. Dr. Jürgen Gauss Department Chemie Johannes Gutenberg-Universität Mainz Duesbergweg 10-14 D-55128 Mainz Tel: +49 6131 39 23736 Mail: gauss@uni-mainz.de Further information

Prof. Dr. Kurt Kremer Max Planck-Institut für Polymerforschung Ackermannweg 10 D-55128 Mainz Tel: +49 6131 379140 Fax: +49 6131 379340 Secr: +49 6131 379141 Mail: kremer@mpip-mainz.mpg.de Further information

Dr. Oleksandra Kukharenko Max Planck-Institut für Polymerforschung Ackermannweg 10 D-55128 Mainz Tel: +49 6131 379783 Fax: +49 6131 379340 Mail: kukharenko@mpip-mainz.mpg.de Further information

Dr. Torsten Stühn Max Planck-Institut für Polymerforschung Ackermannweg 10 D-55128 Mainz Tel: +49 6131 379268 Mail: stuehn@mpip-mainz.mpg.de Further information

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Project C3: Spinodal decomposition of polymer-solvent systems We consider the phase separation of dynamically asymmetric mixtures, in particular polymer solutions, after a sudden quench. Crucial aspects are (i) hydrodynamic momentum transport and (ii) the lack of time-scale separation between molecular relaxation and coarsening. This gives rise to complex dynamical processes such as the transient formation of network-like structures of the slow-component-rich phase, its volume shrinking, and lack of dynamic self-similarity, which are frequently summarized under the term viscoelastic phase separation. The relevant length and time scales of the physical phenomena are too large for microscopic (all atom) simulations. Alternative mesoscopic models based on a bead-spring description of polymer chains coupled to a hydrodynamic background, i.e., the Navier-Stokes equations for the solvent, allow to capture the basic physical principles but they are still computationally demanding. Therefore, macroscopic (two-fluid) models have been proposed in the literature which involve only averaged field quantities […]

Project C6 (Completed): Linking hydrodynamics and microscopic models of wet active matter with anisotropic particles The goal of this project is to develop a systematic, quantitative coarse-graining approach for a class of inherently non-equilibrium systems, namely suspensions of self-propelled particles. We link particle based models with effective hydrodynamic models within a multiscale framework based on sequential coupling and parameter passing. To this end, we combine microscopic Stokesian dynamics simulations with a mesoscopic kinetic model coupled to the macroscopic Stokes equation, and, in a second step, derive an effective hydrodynamic description in terms of particle density, polarization and nematic order parameter profiles. The multiscale scheme is applied to systems of self-propelled rod-like magnetic colloids suspended in a fluid. This is motivated by recent experiments on magnetotactic bacteria, which have shown that the interplay of internal drive (self-propulsion, mutual interactions) and external drive (magnetic field, oxygen gradient) in these systems leads to […]