Fu Ye, Ai Shulun, Guo Zhiguang, Liu Weimin
Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan 430062, People's Republic of China.
Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan 430062, People's Republic of China.
J Colloid Interface Sci. 2023 Nov;649:646-654. doi: 10.1016/j.jcis.2023.06.142. Epub 2023 Jun 20.
By collecting water in the air, it is an important way to solve the problem of water shortage in arid and semi-arid areas. Improving the efficiency of fog harvesting is still a great challenge to be overcome. The use of 3D structure is an excellent strategy, here, a Multiple-biomimetic 3D hydrophilic and superhydrophobic fog harvester with a hump-valley structure was prepared by the combination of thermal processing and spraying. Inspired by biological water collection in nature, a 3D porous sponge surface with hydrophilic valley and superhydrophobic hump was obtained by two-step treatment. This surface structure showed excellent fog harvesting performance, which was 185 % higher than the original sponge. This structure accelerates the capture, transfer and transport of droplets during the fog harvesting process and greatly improves the efficiency of fog harvest. The results show that the chemical gradient and structural gradient actuation we constructed on the melamine sponge surface can effectively improve the fog collection efficiency. A surface with a linear hump-valley mixed wettability pattern is designed, and it is proved that fog collection efficiency can be effectively improved at the droplet capture and transfer stage and transport stage respectively. This study highlights a simple and cheap integrated fog harvester material design.
通过收集空气中的水分，这是解决干旱和半干旱地区缺水问题的重要途径。提高雾滴收集效率仍然是一个有待克服的巨大挑战。采用三维结构是一种出色的策略，在此，通过热处理和喷涂相结合的方法制备了一种具有驼峰-山谷结构的多重仿生三维亲水和超疏水雾滴收集器。受自然界生物集水的启发，通过两步处理获得了具有亲水山谷和超疏水驼峰的三维多孔海绵表面。这种表面结构表现出优异的雾滴收集性能，比原始海绵高出185%。这种结构在雾滴收集过程中加速了液滴的捕获、转移和运输，大大提高了雾滴收集效率。结果表明，我们在三聚氰胺海绵表面构建的化学梯度和结构梯度驱动能够有效提高雾滴收集效率。设计了一种具有线性驼峰-山谷混合润湿性模式的表面，并证明在液滴捕获和转移阶段以及运输阶段分别能够有效提高雾滴收集效率。本研究突出了一种简单且廉价的集成雾滴收集器材料设计。
