Dresden 2017 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 62: Fluids and Interfaces III

CPP 62.8: Vortrag

Donnerstag, 23. März 2017, 17:00–17:15, ZEU 255

Effects of thermal fluctuations on an interface near a contact lineDaniele Belardinelli1, Mauro Sbragaglia1, •Markus Gross2,3, and Bruno Andreotti41Department of Physics & INFN, University of Rome "Tor Vergata", Via della Ricerca Scientifica 1, 00133, Rome, Italy — 2Max-Planck-Institut für Intelligente Systeme, Heisenbergstr. 3, 70569 Stuttgart, Germany — 3IV. Institut für Theoretische Physik, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany — 4Physique et Mecanique des Milieux Heterogenes, UMR 7636 ESPCI-CNRS, Universite Paris-Diderot, 10 rue Vauquelin, 75005, Paris, France

We analytically study a liquid interface contacting a solid wall in the presence of interfacial and contact point fluctuations. A path integral description based on a contact potential is developed which takes fully into account the impenetrability of the wall. We do not assume the presence of a precursor film in front of the effective contact point, but, instead, treat the fluctuations of the contact point explicitly. As a consequence of entropic repulsion, the average profile is curved and a characteristic length scale given by the interfacial roughness emerges. The effect of fluctuations are captured in terms of an effective disjoining pressure. We identify a transition from a partial to a pseudo-partial wetting state, the latter being characterized by a precursor film of constant thickness. In the partial wetting state, instead, we find that the average profile is exponentially decaying in front of the mean contact point. Reference: D. Belardinelli, M. Sbragaglia, M. Gross, B. Andreotti, Phys. Rev. E 94, 052803 (2016)

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