Fabrication of Regular Hierarchical Structures with Superhydrophobic and High Adhesion Performances on a 304 Stainless Steel Surface via Picosecond Laser
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Hierarchical structures significantly influence the development of metal surface wettability. In this study, three kinds of hierarchical structures formed by the superimposition of different nanoscale (quasi-) periodic structures on micro-column arrays were fabricated on 304 stainless steel surfaces via picosecond laser irradiation. Scanning Electron Microscope (SEM) and Confocal Laser Scanning Microscope (CLSM) were used to characterize the created hierarchical structures. An optical contact angle meter was used to analyse the wetting performances. The results show that the surfaces of these fabricated samples have superhydrophobic properties and strong adhesion performances, which can be attributed to the formation of hierarchical structure that causes a reduction in the liquid-solid contact area and the change in the direction of surface tension. By controlling the dimensionof the nanotextures on the micro-column arrays, the hydrophobic property of 304 stainless steel surfaces can be greatly improved.
Keywordssuperhydrophobic hierarchical structure laser irradiation bioinspiration texture adhesion stainless steel
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This work was financially supported by the Natural Science Foundation of Jiangsu Province (BK20150685), the National Natural Science Foundation of China (51705258), and the Foundation for Distinguished Young Talents, College of Engineering, Nanjing Agricultural University (YQ201604).
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