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Advisor(s)
Abstract(s)
The aim of the present work was to investigate the wetting behaviour of biomedical grade Ti-6Al-4V alloy surfaces textured by a femtosecond laser treatment. The material was treated in ambient atmosphere using an Yb: KYW chirped-pulse-regenerative amplification laser with a wavelength of 1030 nm and a pulse duration of 500 fs. Four main types of surface textures were obtained depending on the processing parameters and laser treatment method. These textures consist of: (1) nanoscale laser-induced periodic surface structures (LIPSS); (2) nanopillars; (3) a bimodal roughness distribution texture formed of LIPSS overlapping microcolumns; (4) a complex texture formed of LIPSS overlapping microcolumns with a periodic variation of the columns size in the laser scanning direction. The wettability of the surfaces was evaluated by the sessile drop method using distilled-deionized (DD) water and Hank's balanced salt solution (HBSS) as testing liquids. The laser treated surfaces present a hydrophilic behaviour as well as a high affinity for the saline solution, with equilibrium contact angles in the ranges 24.1-76.2. for DD water and 8.4-61.8. for HBSS. The wetting behaviour is anisotropic, reflecting the anisotropy of the surface textures. (c) 2012 Elsevier B.V. All rights reserved.
Description
Keywords
Wetting behaviour Femtosecond lasers Surface texturing Surface anisotropy Ti-6Al-4V implants Biological model fluids AL2O3-TIC ceramics Titanium implants Contact angles Solid-surfaces Power-law Irradiation Morphology Ablation Mineralization
Citation
CUNHA, Alexandre; SERRO, Ana Paula; OLIVEIRA, Vítor; ALMEIDA, Amélia; VILAR, Rui; DURRIEU, Marie-Christine - Wetting behaviour of femtosecond laser textured Ti-6Al-4V surfaces. Applied Surface Science. ISSN 0169-4332. Vol. 265 (2013), p. 688-696.