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.
Bioinspired {"}skin{"} with Cooperative Thermo-Optical Effect for Daytime Radiative Cooling / Yang, M.; Yang, M.; Zou, W.; Zou, W.; Guo, J.; Guo, J.; Qian, Z.; Qian, Z.; Luo, H.; Luo, H.; Yang, S.; Yang, S.; Zhao, N.; Zhao, N.; Pattelli, L.; Pattelli, L.; Xu, J.; Wiersma, D.S.; Wiersma, D.S.. - In: ACS APPLIED MATERIALS & INTERFACES. - ISSN 1944-8252. - STAMPA. - 12:(2020), pp. 25286-25293. [10.1021/acsami.0c03897]
Bioinspired {"}skin{"} with Cooperative Thermo-Optical Effect for Daytime Radiative Cooling
Luo, H.;Luo, H.;Zhao, N.;Zhao, N.;Pattelli, L.;Pattelli, L.;Wiersma, D. S.;Wiersma, D. S.
2020
Abstract
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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