Berlin 2015 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 5: Anomalous Diffusion (joint session DY, CPP)
CPP 5.9: Vortrag
Montag, 16. März 2015, 11:45–12:00, BH-N 334
On diffusivity landscapes in soft matter — •Felix Roosen-Runge1 and Dominique J. Bicout1,2 — 1Institut Laue-Langevin, Grenoble, France — 2UMR 5525, CNRS and Université Grenoble 1, France
The concept of energy landscapes has been successfully and extensively applied for the understanding of a broad range of phenomena in complex soft matter systems, such as the glass transition and protein folding. However, many experimental accounts – e.g. single-particle tracking, scattering methods and diffusion MRI – access dynamical properties, and not the free energy landscape directly. Thus, it is important to understand and exploit the effects of diffusivity landscapes, i.e. an inhomogeneous diffusivity and viscosity. First, we discuss applicability, implications and limitations of the concept of diffusivity landscapes. Second, we provide analytical approximate solutions for the diffusion equation in dynamically heterogeneous environments. Third, the results can be connected to experiments on e.g. water diffusion in hydration shells, or tracer diffusion through membranes or porous structures.