Dresden 2014 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 6: Posters: Membranes and vesicles
BP 6.9: Poster
Montag, 31. März 2014, 17:30–19:30, P3
The role of ions in the Hydration Interaction between polar surfaces — •Alexander Schlaich1, Matej Kanduc1, Emanuel Schneck2, and Roland R. Netz1 — 1Fachereich Physik, Freie Universität Berlin, Arnimalle 14, 14195 Berlin — 2Institut Laue-Langevin, 6 Rue Jules Horowitz, 38000 Grenoble, France
Atomistic computer simulations are an essential tool for the study of the hydration repulsion between biological membranes, which becomes the dominating force at nanometer separations, giving rise to membrane stability. However, the study of interaction pressures, interaction thermodynamics, and interaction mechanisms with computer simulations still is a challenging task as the correct chemical potential of water needs to be accounted for.
We present atomistic simulations of simple polar surfaces in water and analyze the influence of ions present in the water slab at prescribed chemical potential, using Thermodynamic Extrapolation, a technique which has become available only recently. At physiological conditions ions play an important role both for structural and physiological behavior of membranes. We also present their influence on dielectric properties of the water confined between the surfaces and check the applicability of continuum theory on the observed effects.