Cunha, AlexandreSerro, Ana PaulaOliveira, VitorAlmeida, AméliaVilar, RuiDURRIEU, Marie-Christine2013-10-252013-10-252013-01-15CUNHA, 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. 688-696.0169-433210.1016/j.apsusc.2012.11.085http://hdl.handle.net/10400.21/2788The 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.engWetting behaviourFemtosecond lasersSurface texturingSurface anisotropyTi-6Al-4V implantsBiological model fluidsAL2O3-TIC ceramicsTitanium implantsContact anglesSolid-surfacesPower-lawIrradiationMorphologyAblationMineralizationjournal article