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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 26: Focus: Wetting on smooth and rough surfaces: From spreading to superhydrophobicity II

CPP 26.4: Talk

Wednesday, March 13, 2013, 16:00–16:15, H34

Wetting of non regular rough 3D surfaces — •Ciro Semprebon, Stephan Herminghaus, and Martin Brinkmann — MPI-DS, Göttingen, Germany

Modelling wetting of disordered rough surfaces is a challenging problem as the liquid interface can adopt a large number of different topologies in mechanical equilibrium. A recent study of regular surface topographies demonstrates that topological changes of the interface are important to understand the variety of emerging advancing and receding contact angles [1]. Here, we present a method to compute interfacial equilibria on arbitrary substrate topographies while allowing for varying interface topology. In this method the material contact angle can be controlled via a short ranged interface potential. To demonstrate its applicability, we studied drying of a rough substrate while decreasing the Laplace pressure of the wetting film. The results are compared to drying during a decrease of the total liquid volume or an increasing material contact angle at fixed Laplace pressure.