Reference : Correlation between superhydrophobicity and the power spectral density of randomly ro...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
Engineering, computing & technology : Materials science & engineering
http://hdl.handle.net/2268/75751
Correlation between superhydrophobicity and the power spectral density of randomly rough surfaces
English
Awada, Houssein [Université catholique de Louvain (UCL) > > Institute of Condensed Matter and Nanosciences > >]
Grignard, Bruno [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Jérôme, Christine mailto [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Vaillant, Alexandre [University of Mons (UMons) > > Laboratoire de Physique des Surfaces et des Interfaces (LPSI) > >]
De Coninck, Joël [University of Mons (UMons) > > Laboratoire de Physique des Surfaces et des Interfaces (LPSI) > >]
Nysten, Bernard [Université catholique de Louvain (UCL) > > Institute of Condensed Matter and Nanosciences > >]
Jonas, Alain M. [Université catholique de Louvain (UCL) > > Institute of Condensed Matter and Nanosciences > >]
7-Dec-2010
Langmuir
American Chemical Society
26
23
17798-17803
Yes (verified by ORBi)
International
0743-7463
1520-5827
Washington
DC
[en] coating ; superhydrophobic coating
[en] We show experimentally and analytically that for single-valued, isotropic, homogeneous, randomly rough surfaces consisting of bumps randomly protruding over a continuous background, superhydrophobicity is related to the power spectral density of the surface height, which can be derived from microscopy measurements. More precisely, superhydrophobicity correlates with the third moment of the power spectral density, which is directly related to the notion of Wenzel roughness (i.e., the ratio between the real area of the surface and its projected area). In addition, we explain why randomly rough surfaces with identical root-mean-square roughness values may behave differently with respect to water repellence and why roughness components with wavelength larger than 10 μm are not likely to be of importance or, stated otherwise, why superhydrophobicity often requires a contribution from submicrometer-scale components such as nanoparticles. The analysis developed here also shows that the simple thermodynamic arguments relating superhydrophobicity to an increase in the sample area are valid for this type of surface, and we hope that it will help researchers to fabricate efficient superhydrophobic surfaces based on the rational design of their power spectral density.
Center for Education and Research on Macromolecules (CERM)
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy ; The Walloon Region in the frame of the CORRONET project
Researchers
http://hdl.handle.net/2268/75751
10.1021/la104282q
http://pubs.acs.org/doi/pdf/10.1021/la104282q

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