Dr Patrick Ilg

Complex Fluids and Theoretical Polymer Physics group of the University of Reading

Structure and dynamics of complex fluids: macroscopic description from systematic coarse-graining

Fluids and Materials Seminar

9th November 2017, 2:00 pm – 3:00 pm
Main Maths Building, SM3

Soft matter systems respond sensitively to external perturbations, typically leading to anisotropic macroscopic properties.
On a microscopic level, soft matter systems are successfully described by interacting many-particle models obeying Newtonian dynamics for translational and rotational degrees of freedom. In order to capture the long-time, large-length scale behavior, coarse-grained descriptions of the orientational ordering and dynamics are urgently needed. Here, we discuss a general method based on projection operators and nonequilibrium thermodynamics in order to systematically and consistently connect microscopic and coarse-grained levels of description. We demonstrate the method for the examples of low-molecular polymer melts and nematic liquid crystals and show its benefits and limitations. Finally, we discuss possible applications of the method for complex interfaces.

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