摘要
Metal surfaces play a crucial role in numerous applications,from self-cleaning and anti-icing to anti-fogging and oil-water separation.The regulation of their wettability is essential to enhance their performance in these areas.This paper proposes a multi-state regulation method for metal surface wettability,leveraging nanosecond laser ablation.By creating non-uniform microstructures on a metal surface,the contact area between the solid and liquid phases can be increased,resulting in the attainment of superhydrophilic properties(contact angle(CA),ranging from 4.6°to 8.5°).Conversely,the construction of uniform microstructures leads to a decreased solid-liquid contact area,thereby rendering the metal surface hydrophilic(CA=12.2°–53°).Furthermore,through heat treatment on a surface with uniform microstructures,organic matter adsorption can be promoted while simultaneously reducing surface energy.This process results in the metal surface acquiring hydrophobic properties(CA=92.1°–133.5°),facilitated by the“air cushion effect.”Building on the hydrophobic surface,stearic acid modification can further reduce surface energy,ultimately bestowing the metal surface with superhydrophobic properties(CA=150.1°–152.7°,and sliding angle=3.8°).Performance testing has validated the durability and self-cleaning effectiveness of the fabricated superhydrophobic surface while also highlighting the excellent anti-fog performance of the superhydrophilic surface.These findings strongly indicate the immense potential of these surfaces in various engineering applications.
基金
supported by the Natural Science Foundation of Hunan Province,China(Grant No.2023JJ30669)
the Natural Science Foundation of Changsha City,China(Grant No.kq2208273)
the Fundamental Research Funds for the Central Universities of Central South University(Grant No.2023ZZTS0967)
the Fundamentals and Application Fundamentals Foundation of Guangdong Province,China(Grant No.2022A1515011226)
the Project of State Key Laboratory of Precision Manufacturing for Extreme Service Performance,Central South University(Grant No.ZZYJKT2022-10)
the Project of Guangdong Provincial Key Laboratory of Manufacturing Equipment Digitization(Grant No.2020B1212060014)。
