MilliporeSigma

A radiative cooling structural material.

Science (New York, N.Y.) (2019-05-28)
Tian Li, Yao Zhai, Shuaiming He, Wentao Gan, Zhiyuan Wei, Mohammad Heidarinejad, Daniel Dalgo, Ruiyu Mi, Xinpeng Zhao, Jianwei Song, Jiaqi Dai, Chaoji Chen, Ablimit Aili, Azhar Vellore, Ashlie Martini, Ronggui Yang, Jelena Srebric, Xiaobo Yin, Liangbing Hu
ABSTRACT

Reducing human reliance on energy-inefficient cooling methods such as air conditioning would have a large impact on the global energy landscape. By a process of complete delignification and densification of wood, we developed a structural material with a mechanical strength of 404.3 megapascals, more than eight times that of natural wood. The cellulose nanofibers in our engineered material backscatter solar radiation and emit strongly in mid-infrared wavelengths, resulting in continuous subambient cooling during both day and night. We model the potential impact of our cooling wood and find energy savings between 20 and 60%, which is most pronounced in hot and dry climates.

MATERIALS
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Sigma-Aldrich
1H,1H,2H,2H-Perfluorooctyltriethoxysilane, 98%