Painting on the cool Passive radiative cooling materials emit heat. They can reduce the need for air conditioning by providing daytime cooling but are often challenging to apply to rooftops and other building surfaces. Mandal et al. fabricated porous poly(vinylidene fluoride-co-hexafluoropropene) to create an excellent radiative cooling material. Better yet, the polymer is easy to paint or spray onto a wide range of surfaces, has good durability, and can even be dyed. This makes it a promising candidate for widespread use as a high-performance passive radiative cooling material. Science, this issue p. 315 Tuning the air-filled void distribution in a polymer can produce a film with excellent radiative cooling properties. Passive daytime radiative cooling (PDRC) involves spontaneously cooling a surface by reflecting sunlight and radiating heat to the cold outer space. Current PDRC designs are promising alternatives to electrical cooling but are either inefficient or have limited applicability. We present a simple, inexpensive, and scalable phase inversion–based method for fabricating hierarchically porous poly(vinylidene fluoride-co-hexafluoropropene) [P(VdF-HFP)HP] coatings with excellent PDRC capability. High, substrate-independent hemispherical solar reflectances (0.96 ± 0.03) and long-wave infrared emittances (0.97 ± 0.02) allow for subambient temperature drops of ~6°C and cooling powers of ~96 watts per square meter (W m−2) under solar intensities of 890 and 750 W m−2, respectively. The performance equals or surpasses those of state-of-the-art PDRC designs, and the technique offers a paint-like simplicity.

中文翻译：

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用于高效被动日间辐射冷却的分层多孔聚合物涂层

在凉爽的被动辐射冷却材料上绘画会散发热量。它们可以通过提供白天的冷却来减少对空调的需求，但通常很难应用于屋顶和其他建筑表面。曼达尔等人。制造多孔聚（偏二氟乙烯-共-六氟丙烯）以制造出色的辐射冷却材料。更好的是，该聚合物易于在各种表面上涂漆或喷涂，具有良好的耐用性，甚至可以染色。这使其成为广泛用作高性能被动辐射冷却材料的有希望的候选材料。科学，这个问题 p。315 调整聚合物中充满空气的空隙分布可以产生具有优异辐射冷却性能的薄膜。被动白天辐射冷却 (PDRC) 涉及通过反射阳光和向寒冷的外太空辐射热量来自发冷却表面。当前的 PDRC 设计是电冷却的有前途的替代方案，但效率低下或适用性有限。我们提出了一种简单、廉价且可扩展的基于相转化的方法，用于制造具有优异 PDRC 能力的分层多孔聚（偏二氟乙烯-共-六氟丙烯）[P(VdF-HFP)HP] 涂层。高、独立于基板的半球形太阳反射率 (0.96 ± 0.03) 和长波红外发射率 (0.97 ± 0.02) 允许约 6°C 的低于环境温度下降和约 96 瓦/平方米 (W m-2) 的冷却功率分别在 890 和 750 W m-2 的太阳强度下。性能等于或超过最先进的 PDRC 设计，