Regensburg 2010 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 26: Micro and Nanofluidics I

CPP 26.1: Talk

Wednesday, March 24, 2010, 14:00–14:15, H39

Sorption in elastically coupled microporous media: Equilibrium and dynamics — •Kristian Müller-Nedebock — Stellenbosch University, Stellenbosch, Südafrika

Microporous materials in which small guest molecules can be sorbed and where pores are coupled elastically are studied. We show how multiple state models with elastic interactions can account for experimentally determined adsorption isotherms. We also present a simple theoretical model for an auxetic medium, consisting of counter-rotating hinged elements, that permits selective sorption of molecules in dependence of shape and size. This tuning can be achieved through the application of external hydrostatic pressure on the host. A mean-field treatment of the model indicates both continuous and first-order phase transitions. Finally, we study simple dynamics of filling of medium of one-dimensional, yet elastically coupled pores, which pose extremely interesting and mathematically challenging problems beyond that of slow single-file diffusion. Here we develop a Langevin equation approach in order to understand better the subdiffusive regime.