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A platform for research: civil engineering, architecture and urbanism
A black near-infrared reflective coating based on nano-technology
Highlights CuO nanoparticles are used to develop a black near-infrared reflective coating. Optical and thermal properties of the black coatings made by us are studied. Flake CuO nanoparticles can significantly improve the coating reflective performance.
Abstract The object of this paper is to develop a black near-infrared reflective coating using CuO nanoparticles (NPs), which can reduce the absorbed energy by pavements in urban areas and permafrost regions and can also keep black color at same time. Here we first made 12 types of black coatings containing different types of CuO NPs (spherical CuO NPs, rod CuO NPs, and flake CuO NPs) and various CuO NPs mass percentage (i.e., 6.8%, 12.8%, 18.0%, and 22.6%). We then experimentally studied their spectral reflectance when applied on black substrate and specially evaluated the reflecting performance of three types of coatings (i.e., coatings with different types of CuO NPs and optimal mass percentage, 22.6 wt%) under two different meteorological conditions. Results show that CuO NPs can significantly improve the optical and thermal properties, more specifically: (1) the spectral reflectance of coatings increases with its CuO NPs mass percentage for a fixed CuO NPs shape, however, the near-infrared radiation increase gradually decreases; (2) the coating containing flake CuO NPs has the highest spectral reflectance for a fixed CuO mass percentage; (3) the reflecting performances of three types of coatings vary with local meteorological conditions: use of these three typical coatings in a typical summer meteorological condition can significantly reduce the asphalts' surface temperature by a maximum of 12.62K, 9.01K and 7.31K, respectively, while in a typical autumn meteorological condition can reduce that by a maximum of 10.04K, 8.60K, and 7.96K, respectively. The mechanism that the optical and thermal properties of coatings varies with CuO NPs types is also qualitatively analyzed based on the micro-structures of CuO NPs. Based on the experimental results, the coating containing 22.6 wt% flake CuO NPs is the optimal black near-infrared black reflective coating. The optimized coating can be used in the urban cities for mitigating urban heat island effect and can be also be used in permafrost regions for protecting the underlying permafrost.
A black near-infrared reflective coating based on nano-technology
Highlights CuO nanoparticles are used to develop a black near-infrared reflective coating. Optical and thermal properties of the black coatings made by us are studied. Flake CuO nanoparticles can significantly improve the coating reflective performance.
Abstract The object of this paper is to develop a black near-infrared reflective coating using CuO nanoparticles (NPs), which can reduce the absorbed energy by pavements in urban areas and permafrost regions and can also keep black color at same time. Here we first made 12 types of black coatings containing different types of CuO NPs (spherical CuO NPs, rod CuO NPs, and flake CuO NPs) and various CuO NPs mass percentage (i.e., 6.8%, 12.8%, 18.0%, and 22.6%). We then experimentally studied their spectral reflectance when applied on black substrate and specially evaluated the reflecting performance of three types of coatings (i.e., coatings with different types of CuO NPs and optimal mass percentage, 22.6 wt%) under two different meteorological conditions. Results show that CuO NPs can significantly improve the optical and thermal properties, more specifically: (1) the spectral reflectance of coatings increases with its CuO NPs mass percentage for a fixed CuO NPs shape, however, the near-infrared radiation increase gradually decreases; (2) the coating containing flake CuO NPs has the highest spectral reflectance for a fixed CuO mass percentage; (3) the reflecting performances of three types of coatings vary with local meteorological conditions: use of these three typical coatings in a typical summer meteorological condition can significantly reduce the asphalts' surface temperature by a maximum of 12.62K, 9.01K and 7.31K, respectively, while in a typical autumn meteorological condition can reduce that by a maximum of 10.04K, 8.60K, and 7.96K, respectively. The mechanism that the optical and thermal properties of coatings varies with CuO NPs types is also qualitatively analyzed based on the micro-structures of CuO NPs. Based on the experimental results, the coating containing 22.6 wt% flake CuO NPs is the optimal black near-infrared black reflective coating. The optimized coating can be used in the urban cities for mitigating urban heat island effect and can be also be used in permafrost regions for protecting the underlying permafrost.
A black near-infrared reflective coating based on nano-technology
You, Zhilang (author) / Zhang, Mingyi (author) / Wang, Jiwei (author) / Pei, Wansheng (author)
Energy and Buildings ; 205
2019-10-10
Article (Journal)
Electronic Resource
English
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