期刊
MATERIALS
卷 13, 期 17, 页码 -出版社
MDPI
DOI: 10.3390/ma13173816
关键词
laser irradiation; microtextures; surface modification; superhydrophobicity; functional surface; titanium alloys
类别
资金
- National Natural Science Foundation of China [51805343]
- Natural Science Foundation of Jiangsu Province [BK20180844]
- Postdoctoral Research Foundation of China [7131703318]
Laser irradiation is a popular method to produce microtextures on metal surfaces. However, the common laser-produced microtextures were hierarchical (multiscale), which may limit their applicability. In this paper, a method of two-step laser irradiation, combining first-step strong ablation and sequentially second-step gentle ablation, was presented to produce micron-rough surface with single-scale microtextures. The effect of laser fluence on the Ti-6Al-4V surface morphology and wettability were investigated in detail. The morphology results revealed that the microtextures produced using this method gradually evolved from multiscale to single-scale meanwhile from microprotrusions to microholes with increasing the second-step laser fluence from 0.0 to 2.4 J/cm(2). The wettability and EDS/XPS results indicated that attributing to the rich TiO(2)content and micron roughness produced by laser irradiation, all the two-step laser-irradiated surfaces exhibited superhydrophilicity. In addition, after silanization, all these superhydrophilic surfaces immediately turned to be superhydrophobic with close water contact angles of 155-162 degrees. However, due to the absence of nanotextures, the water-rolling angle on the superhydrophobic surfaces with single-scale microtextures distinctly larger than those with multiscale ones. Finally, using the two-step laser-irradiation method and assisted with silanization, multifunctional superhydrophobic Ti-6Al-4V surfaces were achieved, including self-cleaning, guiding of the water-rolling direction and anisotropic water-rolling angles (like the rice-leaf), etc.
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