In nature, Stenocara beetles have a hydrophilic/hydrophobic contrast surface for water harvesting in the desert by mist condensation in hydrophilic regions and water transport through hydrophobic regions. This nature-inspired wettability contrast surface has been widely studied for water harvesting, efficient heat transfer using dropwise condensation, and liquid arrays for biomedical applications. However, most fabrication methods have used toxic chemical coatings with silanization or fluorination. In this study, extreme wettability contrast aluminum surfaces having stable superhydrophilic/superhydrophobic properties were fabricated with a green manufacturing process including laser beam machining, boiling water treatment, and silicone oil heat treatment without the use of toxic chemicals. The nano-microscale hierarchical structures including nanostructures prepared by boiling water treatment and microstructures prepared by laser texturing became superhydrophobic surface after hydrophobic organic absorption by silicone oil heat treatment. Additional formation of hydrophilic pseudo-boehmite (AlOOH) structure after boiling water treatment of newly laser-textured aluminum could create stable superhydrophilic patterns on the superhydrophobic surface. The fabricated superhydrophobic surface could minimize the AlOOH formation during the additional boiling water treatment for superhydrophilic surface by trapping the air between the solid surface and water. The mechanism of wettability transition was analyzed by surface morphology and surface chemistry. In addition, various superhydrophilic patterns on the superhydrophobic surfaces were fabricated with sub-millimeter precision for demonstration of water droplet arrays and aqueous liquid control.

在自然界中，Stenocara 甲虫具有亲水/疏水对比表面，用于在沙漠中通过亲水区域的雾气凝结和疏水区域的水传输来收集水分。这种受自然启发的润湿性对比表面已被广泛研究用于集水、使用逐滴冷凝的高效传热以及用于生物医学应用的液体阵列。然而，大多数制造方法都使用了硅烷化或氟化的有毒化学涂层。在这项研究中，具有稳定的超亲水/超疏水特性的极端润湿性对比铝表面是通过绿色制造工艺制造的，包括激光束加工、沸水处理和硅油热处理，而不使用有毒化学品。包括沸水处理制备的纳米结构和激光纹理制备的微结构在内的纳米微米级分层结构在硅油热处理后形成疏水性有机物吸收后的超疏水表面。在对新激光纹理化的铝进行沸水处理后，额外形成亲水性假勃姆石 (AlOOH) 结构可以在超疏水表面上产生稳定的超亲水图案。通过在固体表面和水之间捕获空气，制造的超疏水表面可以在超亲水表面的额外沸水处理过程中最大限度地减少 AlOOH 的形成。通过表面形貌和表面化学分析润湿性转变的机制。此外，