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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 40: Colloids and Complex Liquids III

CPP 40.1: Vortrag

Donnerstag, 3. April 2014, 11:15–11:30, ZEU 260

Dynamical signatures of length-scale dependent hydrophobic hydration — •Richard Gregor Weiß¹ and Joachim Dzubiella^1,2 — ¹Humboldt Universität zu Berlin — ²Helmholtz-Zentrum Berlin

We present an investigation of the curvature dependence of water dynamics at hydrophobic solutes by using Molecular Dynamics simulations of SPC/E water at differently sized spherical model surfaces.

As an important novel insight into the subject we present the dependence of water molecule mobility on surface curvature. The findings show that the diffusional behavior and the sojourn times of water molecules at hydrophobic surfaces strongly depend on surface curvature. In addition the curvature dependence exhibits a non-monotonic progression as it is already known for water hydration structure [1].

Our study demonstrates the existence of an intimate connection between static and dynamic curvature effects of hydrophobic hydration. Large implications arise for the interpretation of dynamical measurements of hydration at heterogeneous biomolecular surfaces with varying surface geometry.

[1] D. Chandler, vol. 437, pp 640-647, Nature