Chen Weifeng, Zhang Fatao, Yang Qiming, Yin Chaochuang, Xiao Ting, Jiang Lihua, Bai Xinwei, Tan Xinyu, Lei Yizhu
Guizhou Provincial Key Laboratory of Coal Clean Utilization, School of Chemistry and Materials Engineering, Liupanshui Normal University, Liupanshui City, Guizhou Province 553004, People's Republic of China.
Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, Solar Energy High Value Utilization and Green Conversion Hubei Provincial Engineering Research Center, College of Materials and Chemical Engineering, China Three Gorges University, Yichang City, Hubei Province 443002, People's Republic of China.
Langmuir. 2025 Jul 15;41(27):17369-17379. doi: 10.1021/acs.langmuir.4c01616. Epub 2024 Sep 16.
Atmospheric water harvesting has attracted much attention because of its potential to escalate the global freshwater shortage. However, the water collection efficiency is hindered by the trade-off between fast droplet nucleating and rapid droplet dripping due to the opposite requirements in the chemistry and the morphology of surfaces. Herein, the hierarchical porous composite film (ZIF-8@PVDF/PMMA, HPCF) with superhydrophobicity is designed for highly efficient and stable water harvesting. It indicates that the HPCF film has a large water contact angle (WCA) of 155.50° and ultralow sliding angle (SA) of 2°, exhibiting the self-cleaning function. Significantly, it is demonstrated that the water collection efficiency of HPCF can achieve 1.13 g·cm·h, which is much higher than the value of the blank sample, as well as most of the reported values. It is attributed to the hierarchical porous structure with the ZIF-8 crystals enhancing the surface roughness and endowing the film with the hydrophilic/superhydrophobic regions. This design promotes an optimal balance between droplet nucleation and shedding, significantly enhancing the water harvesting efficiency. Consequently, this work introduces an effective approach for water collection materials suitable for fog/mist conditions and provides an effective solution for the foggy area with water scarcity, demonstrating significance for advancing research aimed at mitigating the worldwide water shortage.
大气水收集因其缓解全球淡水短缺的潜力而备受关注。然而，由于表面化学性质和形态的相反要求，在快速液滴成核和快速液滴滴落之间的权衡阻碍了集水效率。在此，设计了具有超疏水性的分级多孔复合膜（ZIF-8@PVDF/PMMA，HPCF）用于高效稳定的水收集。结果表明，HPCF膜具有155.50°的大接触角（WCA）和2°的超低滑动角（SA），表现出自清洁功能。值得注意的是，结果表明HPCF的集水效率可达1.13 g·cm·h，远高于空白样品的值以及大多数已报道的值。这归因于具有ZIF-8晶体的分级多孔结构，其增强了表面粗糙度并赋予膜亲水/超疏水区域。这种设计促进了液滴成核和脱落之间的最佳平衡，显著提高了集水效率。因此，这项工作为适用于雾/薄雾条件的集水材料引入了一种有效方法，并为缺水的雾区提供了有效解决方案，对推进旨在缓解全球水资源短缺的研究具有重要意义。
