A Molecular Confine-Induced Charged Fiber for Fog Harvesting

IF 17.2 1区工程技术 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Advanced Fiber Materials Pub Date : 2024-08-05 DOI:10.1007/s42765-024-00474-w

Yating Ji, Weifeng Yang, Xiaoyan Li, Yinjie Chen, Bi Xu, Zaisheng Cai

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Abstract

Harvesting fog composed of differently charged droplets offers a potential solution to freshwater crises. Leveraging electrostatic attraction between charged surfaces and droplets to enhance capture efficiency represents an efficacious approach for achieving efficient fog harvesting. However, existing strategies to enhance electrostatic attraction by introducing charges on the surface pose persistence challenges. Here, an asymmetric wettability polyacrylonitrile (PAN) fiber (named Janus-PAN) with stable high surface potential via in-situ molecular confined modification is proposed for fog harvesting. By coupling the high capture efficiency generated by persistent electrostatic interaction and the directional self-driven transport supported by wettability gradient, Janus-PAN achieves a water collection rate (WCR) of 1775 mg/cm²/h, which is 2.6 times higher than that of fibers with low surface potential and no wetting gradient. Moreover, the potential application of the Janus-PAN harp in agricultural irrigation is demonstrated. The previously unreported surface potential control strategy shown here can potentially upgrade the fiber-based fog harvesting materials.

Graphical Abstract

Abstract Image

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用于雾气采集的分子密闭带电光纤

收集由不同电荷的液滴组成的雾，为解决淡水危机提供了一个潜在的解决方案。利用带电表面与液滴之间的静电吸引来提高捕获效率，是实现高效雾收集的有效方法。然而，通过在表面上引入电荷来增强静电吸引的现有策略会带来持久性挑战。在此，我们提出了一种非对称润湿性聚丙烯腈（PAN）纤维（命名为 Janus-PAN），它通过原位分子约束改性具有稳定的高表面电位，可用于雾气捕集。通过耦合持续静电相互作用产生的高捕获效率和润湿梯度支持的定向自驱动传输，Janus-PAN 实现了 1775 mg/cm2/h 的水收集率（WCR），是低表面电位和无润湿梯度纤维的 2.6 倍。此外，还证明了 Janus-PAN Harp 在农业灌溉中的潜在应用。这里展示的以前未报道过的表面电位控制策略有可能提升基于纤维的雾气采集材料的水平。

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来源期刊

Advanced Fiber Materials Multiple-

CiteScore

18.70

自引率

11.20%

发文量

109

期刊介绍： Advanced Fiber Materials is a hybrid, peer-reviewed, international and interdisciplinary research journal which aims to publish the most important papers in fibers and fiber-related devices as well as their applications.Indexed by SCIE, EI, Scopus et al. Publishing on fiber or fiber-related materials, technology, engineering and application.