材料科学
多孔性
发射率
聚偏氟乙烯
聚合物
化学工程
相(物质)
辐射冷却
复合材料
光学
有机化学
热力学
工程类
化学
物理
作者
Lin-hu Li,Guimin Liu,Qing Zhang,Haichao Zhao,Ruidong Shi,Changlin Wang,Zihao Li,Boyi Zhou,Yuanyaun Zhang
标识
DOI:10.1021/acsami.3c19173
摘要
Passive all-day radiative cooling (PARC) films with porous structures prepared via nonsolvent-induced phase separation (NIPS) have attracted considerable attention owing to their cost-effectiveness and wide applicability. The PARC performances of the films correlate with their porous structures. However, the porous structure formed using the NIPS process cannot be finely regulated. In this study, we prepared polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) films with porous structures optimized by rationally tuning the phase separation, which was achieved by adjusting the proportions of two good solvents with varying solubility parameters. The optimized PVDF-HFP film with a hierarchically porous structure exhibited a high solar reflectance of 97.7% and an infrared emissivity of 96.7%. The film with excellent durability achieved an average subambient cooling temperature of approximately 5.4 °C under a solar irradiance of 945 W·m-2 as well as a temperature of 11.2 °C at nighttime, thus demonstrating all-day radiative cooling. The results indicate that the proposed films present a promising platform for large-scale applications in green building cooling and achieving carbon neutrality.
科研通智能强力驱动
Strongly Powered by AbleSci AI