Berlin 2018 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 39: Wetting, Microfluidics and Confined Liquids I (joint session CPP/DY)

DY 39.5: Talk

Wednesday, March 14, 2018, 11:00–11:15, C 264

What determines the lateral adhesion force? — •Doris Vollmer, Nan Gao, Sanghyuk Wooh, Rüdiger Berger, and Hans-Jürgen Butt — MPI für Polymerforschung, Mainz

The mobility of drops on surfaces depends on the interactions between the drop, the surface and its surrounding medium. The strength of the interactions is reflected in the lateral adhesion force, FLA. We have investigated the lateral adhesion forces of droplets of water on a superhydrophobic periodic structure made of TiO2 pillars or varying distance, using a laser deflection system. The force per pillar across the effective contact width did not change with the spacing ratio. Notably, the lateral adhesion force can be calculated, knowing either (i) the apparent contact width and the apparent contact angles or the (ii) real contact width and the contact angle on the corresponding flat surface.