Micro-pits array structure, micro-gratings structure covered with finer nanostructures were generated on titaniumsurfaces using femtosecond laser pulse. The wetting behavior of the two types of surface structures were studied. Micropitsarray structure with a size of dozens of microns exhibits hydrophilic properties, and the hydrophilicity increased withincreasing the number of laser pulses. Micro-gratings structure covered with finer nanostructures exhibits hydrophobicproperties, and the hydrophobicity increased with decreasing the laser energy density. The results demonstrated thatwettability of metallic surface can be facilely controlled by adjusting the femtosecond laser processing parameters. Theformation processes of the two types of surface microstructures as well as the underlying mechanisms for their specialwettability are also discussed. This research might provide a facile controllable strategy to realize special wettability formetal or other solid surfaces, even expand the functions and applications of metals.
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