Abstract
The dependence of wetting behavior on roughness is of great relevance in many practical applications. However, most studies concentrate on static wettability. In this study, the influence of nanoroughness on the spontaneous dewetting of water is investigated. For both smooth and nanorough surfaces, contact line motion is governed by two distinct regimes: hydrodynamic dissipation dominates for small water contact angles, while the molecular kinetic theory describes contact line motion at large contact angles. In a quantitative comparison of nanorough with chemically heterogeneous surfaces, the similarities in behavior suggest that there may be a universal dewetting mechanism.
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