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Self-pumping and scalable fog collector with diode-like micro-hole arrays inspired by natural asymmetric wettability
Applied Materials Today ( IF 8.3 ) Pub Date : 2020-10-15 , DOI: 10.1016/j.apmt.2020.100851
Maolin Zhou , Xuyao He , Xingyu Wu , Lin Xiao , Zehang Cui , Xiaoxuan Tang , Long Guo , Senyun Liu , Hongwei Liu , Yuying Zhu , Yabin Zhang , Guoqiang Li , Jiangong Zhu

Fog collection has been considered as an effective and sustainable approach for relieving the water deficiency in arid regions. Despite great progresses on bioinspired superwetting surfaces towards fog collection, practical fog-collecting devices face challenges by omnidirectional collection and lower-evaporation storage simultaneously. Inspired by unidirectional liquid movement caused by asymmetric wettability on the holey lotus leaf, a self-revolving collector was developed to efficiently harvest the fog in a wind-driven manner, finally storing it lastingly at lower-evaporation rate. Such a collector provided a superhydrophobic external surface for capturing fogdrops, a diode-liquid micro-hole array for the spontaneous droplet movement, and a hydrophilic internal surface for fast droplet collection and long-term storage. The synergy of these structural features together with composition merits made the self-revolving collector show efficient fog collection and lower-evaporation storage. The fog-laden wind field around the collector as well as the relationship between the self-revolving speed and the fog-laden wind speed were explored theoretically. The corresponding model analyses further supported the 49% enhancement of fog collection rate when the collector whipped by 1 m/s fog-laden wind revolves at 18 rad/s. This work opens an avenue for designing a novel fog collector used in real environment and offers a strategy for optimizing the existing fog collectors towards high efficiency.



中文翻译:

具有自然不对称润湿性的二极管状微孔阵列自吸式可扩展雾收集器

人们认为雾收集是缓解干旱地区缺水的有效而可持续的方法。尽管在生物启发的超湿表面上进行雾收集方面取得了很大进展,但实用的雾收集设备同时面临着全向收集和低蒸发存储的挑战。受多孔荷叶上不对称润湿性引起的单向液体运动的启发,开发了一种自转式收集器,以风驱动方式有效地收集雾气,最终以较低的蒸发速率持久存储雾气。这种收集器提供了用于捕获雾滴的超疏水外表面,用于自发移动液滴的二极管液体微孔阵列以及用于快速收集和长期存储的亲水内表面。这些结构特征的协同作用以及组成优点使自转式集尘器显示出有效的雾气收集和较低的蒸发存储。从理论上探讨了集热器周围的大雾风场以及自转速度与大雾风速之间的关系。相应的模型分析进一步支持当以1 m / s载有雾气的风搅打的集尘器以18 rad / s的速度旋转时,集雾率提高49%。这项工作为设计一种在实际环境中使用的新型除雾器开辟了道路,并提供了一种优化现有除雾器以提高效率的策略。从理论上探讨了集热器周围的大雾风场以及自转速度与大雾风速之间的关系。相应的模型分析进一步支持当以1 m / s载有雾气的风搅打的集尘器以18 rad / s的速度旋转时,集雾率提高49%。这项工作为设计一种在实际环境中使用的新型除雾器开辟了道路,并提供了一种优化现有除雾器以提高效率的策略。从理论上探讨了集热器周围的大雾风场以及自转速度与大雾风速之间的关系。相应的模型分析进一步支持当以1 m / s载有雾气的风搅打的集尘器以18 rad / s的速度旋转时,集雾率提高49%。这项工作为设计一种在实际环境中使用的新型烟雾收集器开辟了道路,并提供了一种优化现有烟雾收集器以提高效率的策略。

更新日期:2020-10-16
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