Hu Weiwei, Zhang Fatao, Tan Xinyu, Tu Yiteng, Nie Shijin
College of Science and College of Materials and Chemical Engineering, Solar Energy High Value Utilization and Green Conversion Hubei Provincial Engineering Research Center, China Three Gorges University, Hubei, Yichang 443000, China.
Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials (CTGU), China Three Gorges University, Hubei, Yichang 443000, China.
ACS Appl Mater Interfaces. 2024 Apr 17;16(15):19828-19837. doi: 10.1021/acsami.4c01926. Epub 2024 Apr 3.
Passive radiative cooling (PRC) is a zero-energy-consumption technology that reflects sunlight and radiates heat to cold outer space. In this work, a porous poly(vinylidene fluoride)-poly(methyl methacrylate) (PVDF-PMMA) composite film is fabricated by decorating zinc-imidazolate metal-organic framework (MOF) (ZIF-8) particles obtained by phase inversion. Due to the competent scattering via the coral-like hierarchical structures and the vibration excitations of specific functional groups, the prepared film exhibits good solar reflectance (92.6%) and intermediate infrared emittance (99.1%), with an average sub-ambient cooling of 10.4 °C under a solar radiation intensity of 0.6 AM1.5. Additionally, poly(vinylidene fluoride) has a low surface energy, while the ZIF-8 particles and coral-like hierarchical structures enhance the surface roughness, endowing the surface with significant superhydrophobicity characterized by a water contact angle (WCA) of 157.5° and a sliding angle (SA) of 2°. These films exhibit excellent antibacterial properties. When the content of ZIF-8 particles in the film is 300 mg·L, the antibacterial rate reaches 100% after 1 h of treatment. Thus, the ZIF-8 porous poly(vinylidene fluoride)-poly(methyl methacrylate) composite (ZPPP) film has potential application prospects in areas with high health and environmental requirements, such as cold chain transportation and public spaces.
被动辐射冷却（PRC）是一种零能耗技术，可反射阳光并将热量辐射到寒冷的外层空间。在这项工作中，通过装饰通过相转化获得的锌-咪唑金属有机框架（MOF）（ZIF-8）颗粒，制备了一种多孔聚偏氟乙烯-聚甲基丙烯酸甲酯（PVDF-PMMA）复合膜。由于通过珊瑚状分级结构的有效散射和特定官能团的振动激发，所制备的膜表现出良好的太阳反射率（92.6%）和中红外发射率（99.1%），在0.6 AM1.5的太阳辐射强度下，平均低于环境温度的冷却为10.4°C。此外，聚偏氟乙烯具有低表面能，而ZIF-8颗粒和珊瑚状分级结构提高了表面粗糙度，赋予表面显著的超疏水性，其水接触角（WCA）为157.5°，滑动角（SA）为2°。这些膜表现出优异的抗菌性能。当膜中ZIF-8颗粒的含量为300 mg·L时，处理1 h后的抗菌率达到100%。因此，ZIF-8多孔聚偏氟乙烯-聚甲基丙烯酸甲酯复合材料（ZPPP）膜在冷链运输和公共场所等高健康和环境要求的领域具有潜在的应用前景。
