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Project B8 (N): Hydrodynamic Simulation of Passive and Active Janus Particles Janus particles are colloidal particles whose surface has been modified differently in different locations, creating so-called patches. The patches are designed in a way to generate directional interactions between the Janus particles. Janus particles, therefore, often self-assemble into ordered structures, commonly referred to as lattices or crystal structures, even though the system still is a colloidal solution. By variation of the chemical nature, size and location of the patches, a rich set of lattice structures is accessible. In our work so far, we have focused on triblock Janus particles, which carry attractive van-der-Waals patches on the poles and repulsive electrostatic charges around the equator. We developed a detailed dissipative-particle dynamics model for them, which includes surface chemistry and explicit solvent molecules. With this model and our newly devised adaptive metadynamics method, we could clarify their self-assembly into two-dimensional ordered […]

Prof. Dr. Yongqi Wang Department of Mechanical Engineering Technische Universität Darmstadt Otto-Berndt-Str. 2 D-64287 Darmstadt Tel: +49 6151 1626202 Fax: +49 6151 1626203 Mail: wang@fdy.tu-darmstadt.de Further information

Prof. Dr.-Ing. André Brinkmann Zentrum für Datenverarbeitung Universität Mainz Anselm-Franz-von-Bentzel-Weg 12 D-55099 Mainz Tel: +49 6131 39 26390 Fax: +49 6131 39 26407 Mail: brinkman@uni-mainz.de Further information

Prof. Dr. Michele Cascella Department of Chemistry The Faculty of Mathematics and Natural Sciences Sem Sælands vei 26 0371Oslo, Norway Tel: +47 22855420 Mail: michele.cascella@kjemi.uio.no Further information

Prof. Dr. Florian Müller-Plathe Institut für Physikalische Chemie Technische Universität Darmstadt Alarich-Weiss-Str. 8 D-64287 Darmstadt Tel: +49 6151 16-22621 Fax: +49 6151 16-22619 Mail: f.mueller-plathe@theo.chemie.tu-darmstadt.de Further information

Prof. Dr.-Ing. Martin Oberlack Department of Mechanical Engineering Technische Universität Darmstadt Otto-Berndt-Str. 2 D-64287 Darmstadt Tel: +49 6151 1626200 Mail: oberlack@fdy.tu-darmstadt.de Further information

Prof. Dr. Thomas Speck Institut für Physik Universität Mainz Staudingerweg 9 D-55128 Mainz Tel: +49 6131 39 26915 Fax: +49 6131 39 20496 Mail: thomas.speck@uni-mainz.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

Project C7: Dense active suspensions in the chaotic regime Active matter has become a quickly evolving field spanning from biology and physics to chemistry and engineering. Its defining property is the directed motion—translational, rotational, or both—of its constituents. This directed motion requires the steady input of free energy. Freed from the constraints of thermal equilibrium, active matter exhibits a wide range of novel phenomena; on the level of its single constituents up to emergent many-body collective and dynamic behavior. Extensively studied have been the aggregation of active particles into clusters, swarms, and other highly collective and dynamics states; but also spontaneous flow states where sufficiently high activity triggers the transition from a quiescent to a flowing fluid. At high densities, chaotic behavior has been reported in suspensions of bacteria and in numerical simulations. The aim of this project is to develop a comprehensive multiscale framework that bridges the properties of […]