生体模擬型マイクロピラミッド構造を用いた日中放射冷却凝縮器の開発

被动辐射冷却大气集水技术(PRC-AWH)作为一种节能技术，是解决水资源短缺问题的一种很有前途的替代方案。然而，确保PRC-AWH全天运行是一项具有挑战性的任务。在这里，我们报道了一种自清洁、可伸缩和灵活的分级聚合物薄膜，以实现连续(全天)PRC-AWH，它具有高太阳反射率、高发射率。由于其独特的混合光子和分级结构表面，聚合物薄膜具有高的太阳反射率和理想的红外发射率，并在一天中实现卓越的平均过冷度。室外试验表明，PRC-AWH是在自然天气条件下实现的，可以从大气中收集大量的水。此外，层次化结构确保表面实现超疏水表面，表面收集的灰尘被水滴清除。

Passive radiative cooling atmospheric water harvesting (PRC-AWH) is a promising alternative to overcome water scarcity issues as an energy-saving technique. However, it is a challenging task to ensure all-day PRC-AWH operation. Here, we report a self-cleaning, scalable and flexible hierarchical polymer film to achieve continuous (all-day) PRC-AWH which exhibits high solar reflectivity, high emissivity. Owing to its unique hybrid photonic and hierarchical structured surface, the polymer film exhibits high solar reflectivity and ideal infrared emissivity and achieves superb average subcooling throughout the day. Outdoor tests demonstrate that daytime PRC-AWH is realized in natural weather conditions to collect large amounts of water from the atmosphere. Besides, the hierarchical structures ensure the surfaces achieve superhydrophobic surfaces where the dust collected on the surface is cleared out by water droplets.