含有聚甲基丙烯酸甲酯、二氧化硅和银的透明散热薄膜
Transparent radiative cooling films containing poly(methylmethacrylate), silica, and silver
中文简介
窗户是建筑物或汽车中能源效率最低的部分;然而,辐射冷却作为一种高效的零能耗技术,很少用于建筑物或汽车的窗膜。因此,我们在这项工作中制造了一种用于白天辐射冷却的透明双层薄膜,其中包含一层与改性二氧化硅纳米颗粒 (SiO2 NPs) 均匀混合的聚甲基丙烯酸甲酯 (PMMA) 和一层银。通过现场接枝 PMMA 显着改善了改性 SiO2 NP 在 PMMA 中的分散性,即使在 SiO2 的高填充分数 (20 wt%) 下,辐射冷却膜也具有高透明度。由于具有较强的宽带红外吸收率/发射率 (εAW = 94.3%) 和高太阳光反射率 (ρ ≈ 50%),双层薄膜具有较高的冷却能力,在白天室外制冷测量中,平均温降比纯 PMMA 薄膜低 1.4 °C。在模拟汽车冷却测试中,双层薄膜在太阳高峰时段将内部空间冷却至低于环境温度 6 °C。出色的光学性能和冷却能力表明,建筑和车窗在冷却内部空间方面的应用前景广阔。
英文摘要(原文)
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 (εAW = 94.3%) and high sunlight reflectance (ρ ≈ 50%), the dual-layer film possessed
题录(GB/T 7714)
Lei M Q, Hu Y F, Song Y N, 等. Transparent radiative cooling films containing poly(methylmethacrylate), silica, and silver[J]. Optical Materials, 2021, 122: 111651. DOI: 10.1016/j.optmat.2021.111651.
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