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Multiscale Roughness and Stability of Superhydrophobic Biomimetic Interfaces

Published

Author(s)

Michael Nosonovsky

Abstract

Stability of a composite interface (CI) of roughness-induced superhydrophobic surfaces is studied. In order to have high contact angle and low contact angle hysteresis, superhydrophobic surfaces should be able to form a CI with air pockets in the valleys between asperities. However, the CI may be unstable and can be irreversibly transformed into the homogeneous interface. We formulate stability criterion and identify mechanisms that lead to destabilization of the CI, the capillary waves, surface inhomogeneity, and condensation of nanodroplets, and show that these mechanisms are scale-dependent. To effectively resist these scale-dependent mechanisms, a multiscale (hierarchical) roughness is required. Such multiscale roughness is found in natural and artificial superhydrophobic surfaces.
Citation
Langmuir
Volume
23
Issue
6

Keywords

multiscale roughness, superhydrophobicity, wetting

Citation

Nosonovsky, M. (2017), Multiscale Roughness and Stability of Superhydrophobic Biomimetic Interfaces, Langmuir, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=850968 (Accessed April 16, 2024)
Created February 19, 2017