Berlin 2018 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 70: Poster: Flows, Patterns, Delay, Reaction Diffusion
DY 70.8: Poster
Donnerstag, 15. März 2018, 15:30–18:00, Poster A
Slip-mediated dewetting of polymer microdroplets — •Joshua McGraw1,2, Tak Shing Chan1, Thomas Salez3, Simon Maurer1, Michael Benzaquen3, Elie Raphaël3, Ralf Seemann1, Martin Brinkmann1, and Karin Jacobs1,4 — 1Experimental Physics, Saarland University, 66041 Saarbrücken, Germany — 2Département de Physique, Ecole Normale Supérieure/ Paris Sciences et Lettres (PSL) Research University, CNRS, 75005 Paris, France — 3Laboratoire de Physico-Chimie Théorique, UMR Gulliver 7083, Ecole Supérieure de Physique et de Chimie Industrielles ParisTech/PSL Research University, 75005 Paris, France — 4fLeibniz-Institute for New Materials, 66123 Saarbrücken, Germany
Classical hydrodynamic models predict that infinite work is required to move a three-phase contact line. Assuming a slip boundary condition, in which the liquid slides against the solid, such an unphysical prediction is avoided. Here, we present the results of experiments in which a contact line moves and where slip is a dominating and controllable factor. Spherical cap-shaped polystyrene microdroplets, with nonequilibrium contact angle, are placed on solid self-assembled monolayer coatings from which they dewet. The relaxation is monitored using in situ atomic force microscopy. We find that slip has a strong influence on the droplet evolutions, both on the transient nonspherical shapes and contact line dynamics. The observations are in agreement with scaling analysis and boundary element numerical integration of the governing Stokes equations, including a Navier slip boundary condition.