Berlin 2008 – wissenschaftliches Programm

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SYMP: Symposium Computational Soft matter physics

SYMP 1: Computational soft matter physics

SYMP 1.1: Hauptvortrag

Donnerstag, 28. Februar 2008, 09:30–10:00, H 0105

Hydrodynamic cooperativity in active fluids — •Ignacio Pagonabarraga — Departament de Física Fonamental, Facultat de Física, Martí i Franquès 1, E-08028 Barcelona, Spain

The dynamics of complex fluids leads to a rich variety of structures which emerge out of the interactions between suspended particles, as well as out of the dissipative interactions mediated by the solvent in which they are suspended. The understanding of such non-equilibrium structures requires a proper treatment of the hydrodynamic coupling at a mesoscopic level, in which suspended particles can be resolved in detail. At the same time, the solvent must be coarse grained because a fully atomistic description, in which the solvent molecules are resolved cannot reach the relevant time and length scales in which these materials evolve. I will analyze how such approaches can be developed, and will concentrate in systems which develop structures under non-equilibrium conditions. These can be achieved through external driving of the system or through internal drivings. The latter include relaxation from initial metastable states, as is the case of phase separating mixtures, or the steady states reached by the motion of active particles. I will discuss the analogies between these different situations and will analyze the properties of systems composed by active self-propellig suspended particles. These systems are intrinsically out of equilibrium and therefore display peculiar properties. I will consider the morphologies and structures they can develop at long times and the role of hydrodynamics in these systems.