期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 22, 页码 25286-25293出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c03897
关键词
aerogel; brightness; polar bear; radiative cooling; thermal insulation
资金
- Chinese Academy of Sciences [QYZDB-SSW-SLH025]
- National Natural Science Foundation of China [51673203, 51522308]
Energy-saving cooling materials with strong operability are desirable for sustainable thermal management. Inspired by the cooperative thermo-optical effect in the fur of a polar bear, we develop a flexible, superhydrophobic, and reusable cooling skin by laminating a poly(dimethylsiloxane) film with a highly scattering polyethylene aerogel. Owing to its high porosity (97.9%) and tailored pore size of 3.8 +/- 1.4 mu m, it can achieve superior solar reflectance ((R) over bar (sun) similar to 0.96) and high transparency to irradiated thermal energy ((tau) over bar (PE,MIR) similar to 0.8) at a thickness of 2.7 mm. Combined with the low thermal conductivity (0.032 W m(-1) K-1) of the aerogel, the cooling skin exerts midday sub-ambient temperature drops of 5-6 degrees C in a metropolitan environment, with an estimated limit of 14 degrees C under ideal service conditions. Our generalized bilayer approach can be easily applied to different types of emitters, bridging the gap between night-time and daytime radiative cooling and paving the way for more cost-effective and scalable cooling materials.
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