Dresden 2014 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 18: Wetting, Superamphiophobicity, Micro- and Nanofluidics I

CPP 18.6: Vortrag

Dienstag, 1. April 2014, 10:45–11:00, ZEU 222

Superamphiphobic particles - how small can we go? — Ming Ye, Xu Deng, Javed Ally, Periklis Papadopoulos, Frank Schellenberger, Doris Vollmer, Michael Kappl, and •Hans-Jürgen Butt — Max-Planck-Institut für Polymerforschung, Mainz, Germany

Water and oil repellent coatings - so called superamphiphobic coatings - greatly reduce the interaction between a liquid and a solid. So far only flat or weakly curved superhydrophobic and superamphiphobic surfaces have been designed. This raises the question whether highly curved structures or microspheres are feasible.

Therefore, we coated microspheres with a superamphiphobic layer and measured the force between the spheres and a liquid. A qualitatively different dependence of the adhesion force on the applied load for superamphiphobic and smooth spheres is detected. Furthermore we demonstrate both experimentally and theoretically that superamphiphobicity fails below a critical particle radius, depending on topological details and type of liquid. Therefore, this study sets a fundamental physical limit to the application of superamphiphobic layers for small objects with high curvature.