Dresden 2003 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 20: Soft matter I

DY 20.1: Hauptvortrag

Dienstag, 25. März 2003, 09:30–10:00, G\"OR/226

Simple models for complex fluids — •Martin Kröger — Institut für Theoretische Physik, Fakultät II Math & Naturwiss, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany — Polymer Physics, Institute of Polymers, ETH Zürich, 8092 Zürich, Switzerland

In this talk we are concerned with the theoretical, analytical as well as numerical prediction of flow-induced structure for simple models of complex fluids. Special emphasis is placed on the finitely extendable nonlinear elastic (FENE) chain models, their rheological behavior and the description of their inherently anisotropic material properties via deterministic and stochastic approaches. A number of representative examples are given on how simple (but high-dimensional) models can, and have been implemented in order to enable the analysis of the microscopic origins of the rheological behavior of polymeric materials. These examples are shown to provide us with a number of routes for developing and establishing low-dimensional models devoted to the prediction of a reduced number of significant material properties. Concerning the types of complex fluids, we cover the range from flexible polymers in melts and solutions, wormlike micelles, actin filaments, rigid and semiflexible molecules in flow-induced anisotropic, and also liquid crystalline phases. Fokker-Planck equations and molecular and Brownian dynamics computer simulation methods are involved to formulate and analyze the model fluids.