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Article

Role of Surface Topography in the Superhydrophobic Effect—Experimental and Numerical Studies

1
Faculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, 02-507 Warsaw, Poland
2
Technology Partners Foundation, Pawinskiego 5A, 02-106 Warsaw, Poland
3
Nanotechnology on Surfaces and Plasma Group (CSIC-US), Materials Science Institute of Seville (Consejo Superior de Investigaciones Científicas—Universidad de Sevilla), c/Américo Vespucio 49, 41092 Seville, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Ana Paula Piedade
Materials 2022, 15(9), 3112; https://doi.org/10.3390/ma15093112
Received: 11 January 2022 / Revised: 12 April 2022 / Accepted: 14 April 2022 / Published: 25 April 2022
(This article belongs to the Section Materials Simulation and Design)
Within these studies, the effect of surface topography for hydrophobic coatings was studied both numerically and experimentally. Chemically modified polyurethane coating was patterned by application of a laser beam. A set of patterns with variously distant linear peaks and grooves was obtained. The cross section of the pattern showed that the edges of the peaks and grooves were not sharp, instead forming a rounded, rectangle-like shape. For such surfaces, experimental studies were performed, and in particular the static contact angle (SCA), contact angle hysteresis (CAH), and roll-off angle (ROA) were measured. Profilometry was used to create a numerical representation of the surface. Finite volume method was then applied to simulate the behavior of the water droplets. The model developed herewith enabled us to reproduce the experimental results with good accuracy. Based on the verified model, the calculation was extended to study the behavior of the water droplet on the simulated patterns, both spiked and rectangular. These two cases, despite a similar SCA of the water droplet, have shown extremely different ROA. Thus, more detailed studies were dedicated to other geometrical features of such topography, such as the size and distance of the surface elements. Based on the results obtained herewith, the future design of superhydrophobic and/or icephobic topography is discussed. View Full-Text
Keywords: superhydrophobic surfaces; roll-off angle; wettability superhydrophobic surfaces; roll-off angle; wettability
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MDPI and ACS Style

Haj Ibrahim, S.; Wejrzanowski, T.; Przybyszewski, B.; Kozera, R.; García-Casas, X.; Barranco, A. Role of Surface Topography in the Superhydrophobic Effect—Experimental and Numerical Studies. Materials 2022, 15, 3112. https://doi.org/10.3390/ma15093112

AMA Style

Haj Ibrahim S, Wejrzanowski T, Przybyszewski B, Kozera R, García-Casas X, Barranco A. Role of Surface Topography in the Superhydrophobic Effect—Experimental and Numerical Studies. Materials. 2022; 15(9):3112. https://doi.org/10.3390/ma15093112

Chicago/Turabian Style

Haj Ibrahim, Samih, Tomasz Wejrzanowski, Bartłomiej Przybyszewski, Rafał Kozera, Xabier García-Casas, and Angel Barranco. 2022. "Role of Surface Topography in the Superhydrophobic Effect—Experimental and Numerical Studies" Materials 15, no. 9: 3112. https://doi.org/10.3390/ma15093112

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