期刊
OPTICAL MATERIALS
卷 122, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.optmat.2021.111651
关键词
Daytime radiative cooling; Transparency; Broadband infrared emission; Window film; Energy efficient
资金
- National Natural Science Foundation of China [51773135, 51973138, 52073185, 21878194]
- National Key Research and Development Program of China [2018YFB0704200]
- Harmful Components and Tar Reduction in Cigarette Key Laboratory of Sichuan Province [2020510107340040]
A transparent dual-layer film was fabricated for daytime radiative cooling, with improved dispersion of SiO2 NPs in PMMA and high transparency; the film demonstrated excellent cooling capacity and lowered the temperature significantly in both outdoor and automotive cooling tests.
Window is the least energy-efficient part of buildings or cars; however radiative cooling, as an efficient energy-zero technology, is rarely used in window films of buildings or cars. Therefore, we in this work fabricated a transparent dual-layer film for daytime radiative cooling, which contained a layer of polymethyl methacrylate (PMMA) uniformly mixed with modified silica nanoparticles (SiO2 NPs) and a layer of silver. The dispersion of the modified SiO2 NPs in PMMA was notably improved through in-site grafting PMMA, which resulted in a high transparency of the radiative cooling film even at a high filling fraction of SiO2 (20 wt%). Owing to the strong broadband IR absorbance/emittance (epsilon(AW) = 94.3%) and high sunlight reflectance (rho approximate to 50%), the dual-layer film possessed a high cooling capacity and could achieve an average temperature drop of 1.4 degrees C than pure PMMA film in the daytime outdoor cooling measurement. In the simulated automotive cooling test, the dual-layer film cooled the interior space up to 6 degrees C below ambient temperature during peak solar hours. The excellent optical property and cooling capability exhibit a promising application of building and car windows for cooling their interior spaces.
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