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Wetting, spreading, and adsorption on randomly rough surfaces

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Abstract

The wetting properties of solid substrates with customary (i.e., macroscopic) random roughness are considered as a function of the microscopic contact angle of the wetting liquid and its partial pressure in the surrounding gas phase. Analytic expressions are derived which allow for any given lateral correlation function and height distribution of the roughness to calculate the wetting phase diagram, the adsorption isotherms, and to locate the percolation transition in the adsorbed liquid film. Most features turn out to depend only on a few key parameters of the roughness, which can be clearly identified. It is shown that a first-order transition in the adsorbed film thickness, which we term “Wenzel prewetting”, occurs generically on typical roughness topographies, but is absent on purely Gaussian roughness. It is thereby shown that even subtle deviations from Gaussian roughness characteristics may be essential for correctly predicting even qualitative aspects of wetting.

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  1. Max-Planck-Institute for Dynamics and Self-Organization, Bunsenstr. 10, 37073, Göttingen, Germany

    S. Herminghaus

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Herminghaus, S. Wetting, spreading, and adsorption on randomly rough surfaces. Eur. Phys. J. E 35, 43 (2012). https://doi.org/10.1140/epje/i2012-12043-8

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  • DOI: https://doi.org/10.1140/epje/i2012-12043-8

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