Dresden 2014 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

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

CPP 18.10: Talk

Tuesday, April 1, 2014, 12:00–12:15, ZEU 222

Liquid transport on rough substrates — Ciro Semprebon, •Stephan Herminghaus, and Martin Brinkmann — MPI-DS Goettingen

The ability of liquids to form continuous films on solids is essential for many technical applications such as surface coatings or liquid transport in granulates. In this work we investigate the morphological evolution and transport properties of wetting layers adhering to an irregular rough substrate. To avoid explicit modelling of contact lines, we consider a thin film model with a precursor film and minimize the total interfacial energy. The generic short range interface potential accounts for a finite apparent contact angle of the macroscopically thick regions of the film. Based on the static interfacial profiles obtained by energy minimization, we numerically solve the linearized steady thin film equation and compute the effective mobility of the liquid. Various types of roughness and material contact angles are investigated, either prescribing the pressure in or the volume of the liquid film. Our results show that the connectivity between the domains of macroscopically thick films can be correlated to the effective liquid mobility.