Journal
APPLIED SURFACE SCIENCE
Volume 257, Issue 12, Pages 5213-5218Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2010.12.089
Keywords
Femtosecond laser texturing; Multi-scale surface structuration; Surface topography; Ripples; Wettability; Cassie-Baxter's model
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Topographic and wetting properties of AISI 316L stainless steel and Ti-6Al-V alloys were modified via linearly polarized femtosecond laser pulse irradiation. In order to induce a gradual evolution of the surface topography and wettability, four samples of each alloy were irradiated with different number of pulses. From the topographic point of view, a multi-scale morphology made of nano-and micro-periodic ripples was induced. The increase in the number of pulses led to the appearance of a third scale structure of waviness that is due to the laser scanning. The wettability of alloys was changed from a hydrophilic behavior to a hydrophobic one without lowering surface energies by chemical coatings. The apparent contact angle (CA) increased with increasing the number of pulses. A rise of about 50 degrees of the apparent CA of the Ti-6Al-V was noticed. (C) 2011 Elsevier B. V. All rights reserved.
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