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American Institute of Physics, The Journal of Chemical Physics, 13(143), p. 134705

DOI: 10.1063/1.4932104

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Fluid contact angle on solid surfaces: role of multiscale surface roughness

Journal article published in 2015 by Francesco Bottiglione ORCID, Giuseppe Carbone ORCID, Bo N. J. Persson
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This paper is available in a repository.

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Abstract

We present a simple analytical model and an exact numerical study which explain the role of roughness on different length scales for the fluid contact angle on rough solid surfaces. We show that there is no simple relation between the distribution of surface slopes and the fluid contact angle. In particular, surfaces with the same distribution of slopes may exhibit very different contact angles depending on the range of length-scales over which the surfaces have roughness.