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DY: Fachverband Dynamik und Statistische Physik

DY 38: Wetting, Micro and Nanofluidics (joint session CPP/ DY)

DY 38.1: Talk

Wednesday, March 18, 2015, 15:00–15:15, C 243

Lateral adhesion force of superhydrophobic surfaces — •Doris Vollmer, Dominik Pilat, Nan Gao, Periklis Papadopoulos, Frank Schellenberger, Rüdiger Berger, and Hans-Jürgen Butt — MPI for Polymer Research, Mainz, Germany

We designed an instrument to measure the lateral adhesion force of drops on surfaces (1). The forces required to slide a sessile drop over a surface was measured by means of the deflection of a capillary that stuck in the drop. This allows the investigation of the dynamic lateral adhesion force of water drops on superhydrophobic surfaces. The movement of the drop relative to the surfaces enabled us to resolve the pinning of the three-phase contact line. This was related to the shape of the drop profile, which was recorded by video microscopy. The lateral adhesion of a drop on a superhydrophobic pillar array was quantified in dependence of pillar spacing and drop velocity.

(1) D.W. Pilat, P. Papadopoulos, D. Schaeffel, D. Vollmer, R. Berger, and H.-J. Butt, Langmuir 2012, 28, 16812.