抵御环境老化的持久辐射冷却
Durable radiative cooling against environmental aging.
作者信息
Song Jianing, Zhang Wenluan, Sun Zhengnan, Pan Mengyao, Tian Feng, Li Xiuhong, Ye Ming, Deng Xu
机构信息
Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054, China.
School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China.
出版信息
Nat Commun. 2022 Aug 16;13(1):4805. doi: 10.1038/s41467-022-32409-7.
To fight against global warming, subambient daytime radiative cooling technology provides a promising path to meet sustainable development goals. To achieve subambient daytime radiative cooling, the reflection of most sunlight is the essential prerequisite. However, the desired high solar reflectance is easily dampened by environmental aging, mainly natural soiling and ultraviolet irradiation from sunlight causing yellowish color for most polymers, making the cooling ineffective. We demonstrate a simple strategy to use titanium dioxide nanoparticles, with ultraviolet resistance, forming hierarchical porous morphology via evaporation-driven assembly, which guarantees a balanced anti-soiling and high solar reflectance, rendering anti-aging cooling paint based coatings. We challenge the cooling coatings in an accelerated weathering test against simulated 3 years of natural soiling and simulated 1 year of natural sunshine, and find that the solar reflectance only declined by 0.4% and 0.5% compared with the un-aged ones. We further show over 6 months of aging under real-world conditions with barely no degradation to the cooling performance. Our anti-aging cooling paint is scalable and can be spray coated on desired outdoor architecture and container, presenting durable radiative cooling, promising for real-world applications.
为了应对全球变暖，亚环境日间辐射冷却技术为实现可持续发展目标提供了一条很有前景的途径。要实现亚环境日间辐射冷却，大部分阳光的反射是必不可少的前提条件。然而，理想的高太阳能反射率很容易因环境老化而降低，主要是自然污染以及阳光中的紫外线照射导致大多数聚合物发黄，从而使冷却效果不佳。我们展示了一种简单的策略，即使用具有抗紫外线性能的二氧化钛纳米颗粒，通过蒸发驱动组装形成分级多孔形态，这确保了抗污染和高太阳能反射率之间的平衡，从而制备出抗老化的冷却涂料基涂层。我们在加速老化试验中对冷却涂层进行了测试，模拟3年的自然污染和1年的自然阳光照射，发现与未老化的涂层相比，太阳能反射率仅下降了0.4%和0.5%。我们进一步表明，在实际环境中经过6个多月的老化后，冷却性能几乎没有下降。我们的抗老化冷却涂料具有可扩展性，可以喷涂在所需的户外建筑和容器上，呈现出持久的辐射冷却效果，在实际应用中很有前景。
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