Bioinspired superwetting surfaces for fog harvesting fabricated by picosecond laser direct ablation

水雾收集仿生超润湿表面的皮秒激光加工研究

Fog harvesting has been considered as a promising method for solving water crisis in underdeveloped regions.To mimic and optimize the alleged natural fog harvesting ability of the stenocara beetle,hybrid superhydrophobic(hydrophobic,superhydrophilic)/hydrophilic patterns are processed on stainless steel via picosecond laser direct writing.Basically,after laser processing,the surfaces of stainless steel change from hydrophilic to superhydrophilic.Then,after chemical and heat treatment,the superhydrophilic surfaces become superhydrophobic with ultra-low adhesion,and superhydrophobic(hydrophobic)with ultra-high adhesion,respectively.This work systematically examines the fog harvesting ability of picosecond laser treated surfaces(LTS),pristine surfaces(PS),laser and chemical treated surfaces(LCTS),laser and heat-treated surfaces(LHTS).Compared with the PS,the as-prepared surfaces enhanced the fog harvesting efficiency by 50%.This work provides a fast and simple method to fog collectors,which offer a great opportunity to develop water harvesters for real world applications.

雾收集被认为是解决欠发达地区水资源危机的一种有前景的方法。为了模仿和优化stenocara甲虫的天然水雾收集能力,通过皮秒激光直写技术在不锈钢上加工超疏水(疏水,超亲水)/亲水混合的图案。研究发现经过激光加工后,不锈钢的表面会从亲水变为超亲水。经过化学和热处理后,超亲水表面分别变为具有超低黏附性的超疏水表面和具有超高黏附性的超疏水(疏水)表面。本文系统地研究了原始表面(PS)、皮秒激光处理表面(LTS)、激光和化学处理表面(LCTS)、激光和热处理表面(LHTS)的水雾收集能力。发现与PS相比,所制备的表面可将水雾收集效率提高50%。这项工作为雾收集提供了一种快速而简单的方法,为开发用于现实世界的集水器提供了一个很好的选择。