4.6 Article

Nanodroplets wetting an elastic half-space

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SOFT MATTER
卷 19, 期 27, 页码 5050-5067

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ROYAL SOC CHEMISTRY
DOI: 10.1039/d3sm00136a

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In this paper, the statics and dynamics of nanoscale droplets on elastic, infinitely thick surfaces were studied using the disjoining pressure concept. It was found that the wetting ridge evolves in a non-monotonic way in terms of its maximal height and solid angle over time.
Wetting of deformable surfaces is a highly debated topic in interface science. A classical approach employing the localized Young's traction gamma sin theta and curvature-induced traction following from the spherical cap assumption, is commonly used for the evaluation of the deformation - particularly, a wetting ridge - of the surface. This, however, does not provide insight into the nanophysics behind the soft wetting, and the effect the surface forces have on the wetting ridge geometry is still poorly understood. In the present paper, we use the disjoining pressure concept to study statics and dynamics of nanoscale droplets on elastic, infinitely thick surfaces. We show that the wetting ridge tip geometry does depend on the surface forces. We demonstrate that when the droplet comparable with the range of the surface force action spreads, the wetting ridge evolves in a way that its maximal height and solid angle changes with time non-monotonically.

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