This paper reports the femtosecond (fs) laser and picosecond (ps) laser fabrications to create superhydrophilic surfaces. Subsequently, investigations of the surface morphologies and the surface chemistry using EDS, XRD, and FTIR-spectroscopy are carried out. Due to significant variations in the formation of micro-nano structure and molecular compositions, fs laser and ps laser fabricated surfaces exhibited a noteworthy difference in surface wettability by controlling the laser parameters. It is evident from experimental results that ps laser structured surfaces show efficient superhydrophilic nature (0° contact angle with 300 ± 18 ms spreading time) than the fs laser (0° contact angle with 400 ± 18 ms spreading time) due to higher surface roughness factor and surface energy resulted from laser-induced thermalization. Nevertheless, all fabricated surfaces convert from superhydrophilic to superhydrophobic due to chemisorbed hydroxyl (–OH) and C–C(H) functional group contamination. An eco-friendly zeolite (Na-based ZSM-5) coating is used on such ultrafast laser fabricated surfaces to maintain the superhydrophilic property for more than 14 months. The proposed investigation provides an innovative approach for producing long-term stable superhydrophilic metal surfaces, which are useful for water treatment, microfluidics, and heat transfer applications.

本文报告了飞秒 (fs) 激光和皮秒 (ps) 激光制造以创建超亲水表面。随后，使用 EDS、XRD 和 FTIR 光谱对表面形貌和表面化学进行研究。由于微纳米结构的形成和分子组成的显着变化，通过控制激光参数，fs 激光和 ps 激光制造的表面在表面润湿性方面表现出显着的差异。从实验结果中可以明显看出，由于更高的表面粗糙度，ps 激光结构化表面显示出比 fs 激光（0° 接触角，400 ± 18 ms 传播时间）有效的超亲水性（0° 接触角，300 ± 18 ms 传播时间）因子和表面能是由激光诱导的热化引起的。尽管如此，由于化学吸附的羟基 (-OH) 和 C-C(H) 官能团污染，所有制造的表面都从超亲水转变为超疏水。在这种超快激光制造表面上使用环保沸石（Na 基 ZSM-5）涂层，以保持超亲水性能超过 14 个月。拟议的研究为生产长期稳定的超亲水金属表面提供了一种创新方法，可用于水处理、微流体和传热应用。