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DY: Fachverband Dynamik und Statistische Physik

DY 56: Wetting, Nano- and Microfluidics II (joint session CPP/DY)

DY 56.2: Vortrag

Donnerstag, 10. März 2016, 15:15–15:30, H42

Traction forces of water droplets on super-hydrophobic surfaces — •Martin Tress, Alexander Saal, Frank Schellenberger, and Noemí Encinas — Max Planck Institute for Polymer Research, Mainz

Surfaces with super-hydrophobic properties play an important role in both nature and science. Thereby, the artificial surfaces typically try to copy the characteristic features of their natural pendants. That is in general, a hydrophobic surface chemistry combined with a structured topography. To investigate the particular impact of these characteristics model surfaces with pillars of varying size, arrangement and surface coating have been employed [1]. While many studies used rigid pillars to maintain a well-defined topography, in the present work flexible pillars are focused. When imaged with a Laser Scanning Confocal Microscope, these flexible pillars act as cantilevers to detect traction forces of a drop resting on their top. By that, the distribution of the forces in parallel to the surface along the contact line is recorded. Especially the traction forces of the receding contact line of an evaporating drop will be illuminated.

[1] P. Papadopoulos et al. PNAS 9 (2013) 3254