Berlin 2008 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 22: POSTERS Micro- and Nanofluidics
CPP 22.12: Poster
Mittwoch, 27. Februar 2008, 16:00–18:30, Poster A
Water structure and slippage at hydrophobic and hydrophilic surfaces — •Christian Sendner1, Jiri Janecek2, and Roland Netz1 — 1Physik Department, Technische Universität München — 2Institute of Physical and Applied Chemistry, Brno University of Technology, Czech Republic
Via Monte Carlo and Molecular Dynamics simulations, we probe the structure and slippage of water films at hydrophobic and hydrophilic surfaces. At nonpolar, hydrophobic surfaces, a depletion of the water density is observed which is set in relation to the wetting properties. At hydrophilic surfaces, achieved with polar hydroxyl groups on top, we examine the interfacial water structure dependent on the density, spatial distribution and angular orientation of the polar groups. In non-equilibrium simulations the slip length of sheared water layers between two hydrophobic surfaces is examined as well as the structural changes of interfacial water at hydrophilic surfaces under the influence of shearing.