Regensburg 2007 – scientific programme
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O: Fachverband Oberflächenphysik
O 67: Symposium: The Solid-Liquid Interface: A Challenge for Theoreticians II
O 67.8: Talk
Friday, March 30, 2007, 12:30–12:45, H38
Surface stress and surface tension at charged solid-liquid interfaces — •Dominik Kramer1 and Jörg Weissmüller1,2 — 1Institut für Nanotechnologie, Forschungszentrum Karlsruhe, Postfach 3640, 76021 Karlsruhe, Germany — 2Technische Physik, Universität des Saarlandes, 66041 Saarbrücken, Germany
Most experimental and theoretical results of surface stress changes of electrodes support either the view that the variations of surface stress are identical or similar of that of surface tension, i.e. have essentially a quadratic dependence on the potential, or that the basic dependence is a linear function of the charge. By using a simple model of the solid surface and using both the Lippmann equation (which describes the potential dependence of surface tension) and Shuttleworth's equation (which relates stress and tension) we demonstrate that the surface stress can be considered as a sum of two terms. The first one is a linear function of the surface tension; the second one is a linear function of the surface charge density. This comprehensive description allows explaining of the different results and their seeming discrepancies without assuming experimental errors or fundamental thermodynamic problems.