Role of Surface Topography in the Superhydrophobic Effect—Experimental and Numerical Studies
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...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-04-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/9/3112 |
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| author | Samih Haj Ibrahim Tomasz Wejrzanowski Bartłomiej Przybyszewski Rafał Kozera Xabier García-Casas Angel Barranco |
| author_facet | Samih Haj Ibrahim Tomasz Wejrzanowski Bartłomiej Przybyszewski Rafał Kozera Xabier García-Casas Angel Barranco |
| author_sort | Samih Haj Ibrahim |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T03:59:23Z |
| format | Article |
| id | doaj.art-54712fc2a23a44d4bc7bb7d04e4e084a |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T03:59:23Z |
| publishDate | 2022-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-54712fc2a23a44d4bc7bb7d04e4e084a2023-11-23T08:38:21ZengMDPI AGMaterials1996-19442022-04-01159311210.3390/ma15093112Role of Surface Topography in the Superhydrophobic Effect—Experimental and Numerical StudiesSamih Haj Ibrahim0Tomasz Wejrzanowski1Bartłomiej Przybyszewski2Rafał Kozera3Xabier García-Casas4Angel Barranco5Faculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, 02-507 Warsaw, PolandFaculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, 02-507 Warsaw, PolandFaculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, 02-507 Warsaw, PolandFaculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, 02-507 Warsaw, PolandNanotechnology 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, SpainNanotechnology 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, SpainWithin 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.https://www.mdpi.com/1996-1944/15/9/3112superhydrophobic surfacesroll-off anglewettability |
| spellingShingle | Samih Haj Ibrahim Tomasz Wejrzanowski Bartłomiej Przybyszewski Rafał Kozera Xabier García-Casas Angel Barranco Role of Surface Topography in the Superhydrophobic Effect—Experimental and Numerical Studies Materials superhydrophobic surfaces roll-off angle wettability |
| title | Role of Surface Topography in the Superhydrophobic Effect—Experimental and Numerical Studies |
| title_full | Role of Surface Topography in the Superhydrophobic Effect—Experimental and Numerical Studies |
| title_fullStr | Role of Surface Topography in the Superhydrophobic Effect—Experimental and Numerical Studies |
| title_full_unstemmed | Role of Surface Topography in the Superhydrophobic Effect—Experimental and Numerical Studies |
| title_short | Role of Surface Topography in the Superhydrophobic Effect—Experimental and Numerical Studies |
| title_sort | role of surface topography in the superhydrophobic effect experimental and numerical studies |
| topic | superhydrophobic surfaces roll-off angle wettability |
| url | https://www.mdpi.com/1996-1944/15/9/3112 |
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