Bioinspired "Skin" with Cooperative Thermo-Optical Effect for Daytime Radiative Cooling
Bioinspired "Skin" with Cooperative Thermo-Optical Effect for Daytime Radiative Cooling
复制标题
具有协同热光效应的仿生“皮肤”，可实现日间辐射冷却
DOI：
10.1021/acsami.0c03897
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发表时间：
2020
影响因子：
9.5
通讯作者：
Wiersma Diederik S.
中科院分区：
文献类型：
--
作者：
Yang Meng;Zou Weizhi;Guo Jing;Qian Zhenchao;Luo Heng;Yang Shijia;Zhao Ning;Pattelli Lorenzo;Xu Jian;Wiersma Diederik S.
可操作性强的节能冷却材料是可持续热管理的理想选择。受北极熊皮毛中协同热光效应的启发，我们通过将聚二甲基硅氧烷薄膜与高散射聚乙烯气凝胶层压在一起，开发了一种灵活且可重复使用的冷却皮肤。由于其97.9%的高孔隙率和3.8 ± 1.4微米的定制孔径，在2.7 mm的厚度下可以实现0.96的上级太阳能反射率和0.8的对辐射热能的高透明度。结合气凝胶0.032 W/m/K的低热导率，在大城市环境中，冷却表层在中午使低于环境温度的温度下降5-6度，在理想的使用条件下，估计极限为14度。我们设想，这种广义的双层方法将构建从夜间到白天辐射冷却的桥梁，并为经济，可扩展，灵活和可重复使用的冷却材料铺平道路。
Energy-saving cooling materials with strong operability are desirable towards sustainable thermal management. Inspired by the cooperative thermo-optical effect in fur of polar bear, we develop a flexible and reusable cooling skin via laminating a polydimethylsiloxane film with a highly-scattering polyethylene aerogel. Owing to its high porosity of 97.9% and tailored pore size of 3.8 +- 1.4 micrometers, superior solar reflectance of 0.96 and high transparency to irradiated thermal energy of 0.8 can be achieved at a thickness of 2.7 mm. Combined with low thermal conductivity of 0.032 W/m/K of the aerogel, the cooling skin exerts midday sub-ambient temperature drops of 5-6 degrees in a metropolitan environment, with an estimated limit of 14 degrees under ideal service conditions. We envision that this generalized bilayer approach will construct a bridge from night-time to daytime radiative cooling and pave the way for economical, scalable, flexible and reusable cooling materials.