膜
材料科学
多孔性
化学工程
纳米技术
共价键
溶剂
多孔介质
表面改性
化学
复合材料
有机化学
工程类
生物化学
作者
Jiaao Yao,Hongyu Zuo,Jingjie Bi,Yanjun Liu,Huiqing Wu,Jiayin Yuan,Yiwang Chen,Yaozu Liao,Weiyi Zhang
标识
DOI:10.1002/anie.202418896
摘要
Friction plays a pivotal role in many phenomena of physical chemistry and has long been in the focus of research thereof. As a crucial parameter, frictions in membranes’ inner and/or outer surface can be minimized to reduce solvent inlet pressure and enlarge inner pore fluid flux, ideally reaching near frictionless transport of water at nanoscale. Inspired by the leaf structure of Tillandsia, a porous membrane with a rough surface and a hydrophilic inlet together with hydrophobic pore channels was designed and fabricated, based on covalent organic frameworks (COFs). Combined with COFs’ inherent highly oriented pore structures, the as‐made asymmetric membranes through chemical etching can minimize the solvent critical intrusion pressure and enable inner pore low friction water transport. Ultimately, obtained COF membranes succeeded in trapping fog from air and achieved a water harvesting rate (WHR) of 1570 mg cm‐2 h‐1, together with small molecular pollutants filtrated off in the meantime. Intriguingly, the synthesized asymmetric COF membranes illustrated unidirectional low friction water collecting and transporting features, the successful imitation of T. macdougallii. This work presents a practical strategy to construct functional porous membranes for low friction water collection and transport, and created a model paradigm to design fluid transporting pore channels.
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