Cracked Metal–Phenolic Networks with Durable Confinement Capillarity for Enhanced Solar Desalination

IF 27.4 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Zhenxing Wang, Min Hu, Lin Zhu, Jiajing Zhou, Fang He, Yanzhu Liu, Yongxiu Li, Yuexiang Li, Zhixing Lin, Frank Caruso
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Abstract

Solar-driven interfacial desalination is a promising strategy to address freshwater shortages. Water evaporation can be enhanced through confinement capillarity by generating ultra-thin water layers on the internal surfaces of porous photothermal materials. However, realizing confinement capillarity relies on coatings composed of aggregated nanospheres, which likely detach under mechanical compression, limiting their practical application. Herein, nature-inspired crack patterns are introduced into adhesive photothermal supramolecular materials, metal–phenolic network coatings, forming C-MPNs to achieve durable confinement capillarity. The crack patterns can be controlled to optimize water transport through narrow channels, enhancing the evaporation rate from 1.6 to 3.3 kg m−2 h−1 while preventing salt accumulation during seawater desalination. Furthermore, the cracks serve as buffer zones, significantly improving the mechanical stability of C-MPN coatings under compression (exhibiting negligible change after 300 cycles)—overcoming a key challenge that has hindered the practical application of confinement capillarity. Furthermore, due to the enhanced confinement capillarity in C-MPNs, high evaporation performance is sustained even as the size of the photothermal material increases—a rare characteristic among 3D photothermal materials. This work provides fundamental insights into the design of photothermal coatings with confinement capillarity, paving the way for their application in solar desalination.

Abstract Image

具有持久约束毛细的金属-酚醛网络用于强化太阳能海水淡化
太阳能驱动的界面海水淡化是解决淡水短缺的一个很有前途的策略。通过在多孔光热材料的内表面产生超薄水层,约束毛细作用可以增强水分蒸发。然而,实现约束毛细管作用依赖于由聚集的纳米球组成的涂层,这些涂层在机械压缩下可能会脱落,限制了它们的实际应用。本文将受自然启发的裂纹模式引入到粘附光热超分子材料、金属-酚醛网络涂层中,形成c - mpn,以实现持久的约束毛细作用。通过控制裂缝模式,可以优化窄通道输水,将蒸发速率从1.6 kg m−2 h−1提高到3.3 kg m−2 h−1,同时防止海水淡化过程中的盐分积累。此外,裂纹作为缓冲带,显著提高了C-MPN涂层在压缩下的机械稳定性(300次循环后变化可以忽略不计),克服了阻碍约束毛细作用实际应用的关键挑战。此外,由于c - mpn中的约束毛细管作用增强,即使光热材料的尺寸增加,也能保持高蒸发性能,这是3D光热材料中罕见的特性。这项工作为具有约束毛细的光热涂层的设计提供了基本的见解,为其在太阳能脱盐中的应用铺平了道路。
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来源期刊
Advanced Materials
Advanced Materials 工程技术-材料科学:综合
CiteScore
43.00
自引率
4.10%
发文量
2182
审稿时长
2 months
期刊介绍: Advanced Materials, one of the world's most prestigious journals and the foundation of the Advanced portfolio, is the home of choice for best-in-class materials science for more than 30 years. Following this fast-growing and interdisciplinary field, we are considering and publishing the most important discoveries on any and all materials from materials scientists, chemists, physicists, engineers as well as health and life scientists and bringing you the latest results and trends in modern materials-related research every week.
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