Stable Superhydrophobic Aluminum Surfaces Based on Laser-Fabricated Hierarchical Textures
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Institut für Fertigungstechnik, Technische Universität Dresden, George-Bähr-Str. 3c, 01069 Dresden, Germany
2
PROBIEN-CONICET, Dto. de Electrotecnia, Universidad Nacional del Comahue, Neuquén 8300, Argentina
3
Fraunhofer-Institut für Werkstoff- und Strahltechnik (IWS), Winterbergstr. 28, 01277 Dresden, Germany
*
Author to whom correspondence should be addressed.
Materials 2021, 14(1), 184; https://doi.org/10.3390/ma14010184
Received: 4 December 2020
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Revised: 23 December 2020
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Accepted: 28 December 2020
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Published: 2 January 2021
(This article belongs to the Special Issue Advances in Laser Processing)
Laser-microtextured surfaces have gained an increasing interest due to their enormous spectrum of applications and industrial scalability. Direct laser interference patterning (DLIP) and the well-established direct laser writing (DLW) methods are suitable as a powerful combination for the fabrication of single (DLW or DLIP) and multi-scale (DLW+DLIP) textures. In this work, four-beam DLIP and DLW were used independently and combined to produce functional textures on aluminum. The influence of the laser processing parameters, such as the applied laser fluence and the number of pulses, on the resulting topography was analyzed by confocal microscopy and scanning electron microscopy. The static long-term and dynamic wettability characteristics of the laser-textured surfaces were determined through water contact angle and hysteresis measurements, revealing superhydrophobic properties with static contact angles up to 163° and hysteresis as low as 9°. The classical Cassie–Baxter and Wenzel models were applied, permitting a deeper understanding of the observed wetting behaviors. Finally, mechanical stability tests revealed that the DLW elements in the multi-scale structure protects the smaller DLIP features under tribological conditions.
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Keywords:
single-and multi-scale textures; direct laser interference patterning; direct laser writing; superhydrophobicity; aluminum 1050
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MDPI and ACS Style
Milles, S.; Dahms, J.; Soldera, M.; Lasagni, A.F. Stable Superhydrophobic Aluminum Surfaces Based on Laser-Fabricated Hierarchical Textures. Materials 2021, 14, 184. https://doi.org/10.3390/ma14010184
AMA Style
Milles S, Dahms J, Soldera M, Lasagni AF. Stable Superhydrophobic Aluminum Surfaces Based on Laser-Fabricated Hierarchical Textures. Materials. 2021; 14(1):184. https://doi.org/10.3390/ma14010184
Chicago/Turabian StyleMilles, Stephan, Johannes Dahms, Marcos Soldera, and Andrés F. Lasagni. 2021. "Stable Superhydrophobic Aluminum Surfaces Based on Laser-Fabricated Hierarchical Textures" Materials 14, no. 1: 184. https://doi.org/10.3390/ma14010184
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