Dresden 2006 – wissenschaftliches Programm
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DY: Dynamik und Statistische Physik
DY 46: Poster
DY 46.98: Poster
Donnerstag, 30. März 2006, 16:00–18:00, P1
Wetting Transitions at the Free Surface of Binary Liquids studied by Faraday Waves — •Stephan Gier1,2, Andriy Kityk3, Christian Wagner1, and Patrick Huber2 — 1Experimentalphysik, Universität des Saarlandes, D-66041 Saarbrücken — 2Technische Physik, Universität des Saarlandes, D-66041 Saarbrücken — 3Institute for Computer Science, Technical University of Czestochowa, PL-42200 Czestochowa
We present measurements on standing surface waves at the free surface of two binary liquids (pentane/water and methanol/cyclohexane) as a function of temperature, T, and molar fraction, x, of one component. The critical acceleration, ac and the wave number, kc, for surface waves exhibit distinct changes upon variation of T and x that can be related to surface wetting transitions. Thus we demonstrate that Faraday surface waves allow visualizing and examining on a macroscopic scale rheological changes triggered by modifications of the microscopic surface structure of liquids.