Wu Junda, Yan Zhuo, Yan Yongsheng, Li Chunxiang, Dai Jiangdong
Institute of Green Chemistry and Chemical Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang212013, P. R. China.
School of Materials Science and Engineering, Jiangsu University, Zhenjiang212013, P. R. China.
ACS Appl Mater Interfaces. 2022 Nov 2;14(43):49338-49351. doi: 10.1021/acsami.2c14808. Epub 2022 Oct 21.
Fog-harvesting devices (FHDs) have been widely explored and applied to alleviate the shortage of fresh water. However, during the fog collection process, how to maintain a balance between fog capture and water removal behaviors to enhance the water collection rate still remains a challenge. Herein, inspired by the beetle, we combined a beetle-like Janus surface and the conventional cross-sectional Janus structure together, developed a simple spray-and-dry strategy to obtain three types of biomimetic asymmetric meshes, and explored the working modes for atmospheric fog collection. The surface wettability could be carefully controlled, and various asymmetric meshes with different water transportation behaviors were obtained. Through a detailed study of the fog collection process, we concluded that there existed three main working modes: Janus mode, hybrid mode, and Janus and hybrid mode. It was noted that the dual-directional Janus pump with the Janus and hybrid working mode balanced the fog capture and water removal ability and exhibited the highest water collection rate of 2478.73 mg m h, which was 2.61 times more than that of the corresponding superhydrophilic mesh. Furthermore, the prepared dual-directional Janus pump showed superior mechanical durability and antibacterial ability. In general, this work was considered instrumental in the reasonable design of biomimetic asymmetric meshes and could provide references for efficient atmospheric fog harvesting.
雾收集装置（FHDs）已被广泛研究和应用，以缓解淡水短缺问题。然而，在雾收集过程中，如何在雾捕获和排水行为之间保持平衡以提高集水率仍然是一个挑战。在此，受甲虫启发，我们将类似甲虫的Janus表面与传统的横截面Janus结构相结合，开发了一种简单的喷雾干燥策略，以获得三种类型的仿生不对称网，并探索了大气雾收集的工作模式。表面润湿性可以得到精确控制，从而获得具有不同水传输行为的各种不对称网。通过对雾收集过程的详细研究，我们得出存在三种主要工作模式：Janus模式、混合模式以及Janus和混合模式。值得注意的是，具有Janus和混合工作模式的双向Janus泵平衡了雾捕获和排水能力，展现出最高的集水率，为2478.73毫克/平方米·小时，是相应超亲水网的2.61倍。此外，制备的双向Janus泵具有优异的机械耐久性和抗菌能力。总体而言，这项工作被认为有助于仿生不对称网的合理设计，并可为高效的大气雾收集提供参考。
