Wettability regulation from superhydrophilic to superhydrophobic via nanosecond laser ablation  

作　　者：CHEN Zhi WU ZhiCheng ZHANG GuoJun LI DongHui HAN FengLin 

机构地区：[1]State Key Laboratory of Precision Manufacturing for Extreme Service Performance,College of Mechanical and Electrical Engineering,Central South University,Changsha,410083,China [2]Guangdong Provincial Key Laboratory of Manufacturing Equipment Digitization,Guangdong HUST Industrial Technology Research Institute,Dongguan,523808,China [3]China Harzone Industry Corp.,Ltd.,Wuhan,430299,China

出　　处：《Science China(Technological Sciences)》2024年第6期1829-1841,共13页中国科学（技术科学英文版）

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)。

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.

关 键 词：nanosecond laser ablation surface wettability SUPERHYDROPHOBIC SUPERHYDROPHILIC 

分 类 号：TG665[金属学及工艺—金属切削加工及机床]