Depinning of three-dimensional drops from wettability defects

Abstract

Substrate defects crucially influence the onset of sliding drop motion under lateral driving. A finite force is necessary to overcome the pinning influence even of microscale heterogeneities. The depinning dynamics of three-dimensional drops is studied for hydrophilic and hydrophobic wettability defects using a long-wave evolution equation for the film thickness profile. It is found that the nature of the depinning transition explains the experimentally observed stick-slip motion.

6 pages, 9 figures, submitted to epl

References in corpus (2)

• Long-wave theory of bounded two-layer films with a free liquid-liquid interface: Short- and long-time evolution
• Drops on an inclined heterogeneous substrate: onset of sliding motion

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• A continuous time random walk model of transport in variably saturated heterogeneous porous media
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• Emergence of the bifurcation structure of a Langmuir-Blodgett transfer model
• The collective behaviour of ensembles of condensing liquid drops on heterogeneous inclined substrates
• Statics and Dynamics of Polymeric Droplets on Chemically Homogeneous and Heterogeneous Substrates