Berlin 2015 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 46: P11: Wetting, Micro and Nano Fluidics
CPP 46.18: Poster
Wednesday, March 18, 2015, 10:00–13:00, Poster A
Force response of actively deformed polymer microdroplets: dependence on the solid/liquid boundary condition — •Jonas Heppe1,2, Joshua D. McGraw2, Roland Bennewitz1, and Karin Jacobs1,2 — 1INM - Leibniz Institute for New Materials, D-66123, Saarbrücken, Germany — 2Saarland University, Experimental Physics, D-66041, Saarbrücken, Germany
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 liquid polymer micron sized droplets and films. 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.