Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 13: Solid / liquid interfaces I

O 13.2: Vortrag

Montag, 14. März 2011, 15:15–15:30, WIL B321

Static Dielectric Reponse of Water at Planar Interfaces — •Douwe Jan Bonthuis, Stephan Gekle, and Roland Netz — TU München, Deutschland

The water structure close to an interface strongly influences the interaction between charged solutes. A key factor in these short-ranged interactions is the dielectric response function of the first few water layers, which differs appreciably from the bulk dielectric constant. From molecular dynamics simulations, we calculate the static dielectric tensor of water close to various surfaces, using two different methods: (1) relating the dielectric function to the fluctuations of the polarization density and (2) directly calculating the response to an external electric field. While the components of the tensor parallel to the surface closely follow the water density, the perpendicular component shows a highly non-trivial profile.