Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 47: Poster: Interfaces and Thin Films
CPP 47.10: Poster
Mittwoch, 9. März 2016, 18:15–21:00, Poster B2
Force response of actively deformed polymer microdroplets and -films: dependence on the solid/liquid boundary condition — •Jonas R. Heppe1,2, Joshua D. McGraw2,3, Roland Bennewitz1, and Karin Jacobs2 — 1INM - Leibniz Institute for New Materials, D-66123 Saarbrücken — 2Saarland University, Experimental Physics, D-66041 Saarbrücken — 3Ecole Normale Supérieure, Département de Physique, F-75005, Paris
In fluid dynamics, the solid/liquid boundary condition can play a major role in the flow behavior of a liquid. For example, in the dewetting of identical polymer films on weak slip or strong slip substrates, large qualitative and quantitative differences are observed. Therefore, when applying an external load to a liquid resting on such substrates, the measured reaction forces and the ensuing flow should also depend on the boundary condition. We present atomic force microscopy measurements in which the reaction force of a cantilever is measured as the tip pierces micron-sized droplets and films of polymeric liquid. These indentations are done on substrates with tuned slip. Accessing the size, depth and rate dependence of the resulting force distance curves, we show an influence of the slip condition on the dissipated energy and adhesion.