Lam Do Van, Dung Dao Thi, Nguyen Uyen Nhat Trieu, Kang Hyun Seok, Bae Byeong-Soo, Kim Hyeon-Don, Lim Mikyung, Kim Duckjong, Kim Jae-Hyun, Lee Seung-Mo
National Creative Research Initiative Center for Functionally Antagonistic Nano-Engineering, Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, South Korea.
Korea Institute of Machinery and Materials (KIMM), 156 Gajeongbuk-ro, Yuseong-gu, Daejeon, 34103, South Korea.
Small Methods. 2025 Mar;9(3):e2401141. doi: 10.1002/smtd.202401141. Epub 2024 Aug 16.
Passive radiative cooling represents a transformative approach to achieving sustainable cooling on Earth without relying on energy consumption. In this research, the optical characteristics of five readily accessible metal-organic frameworks (MOFs): ZIF-67(Co), MOF-74(Ni), HKUST-1(Cu), MOF-801(Zr), and UiO-66(Zr) are meticulously explored. The objective is to identify the pivotal factors that influence their ability to facilitate radiative cooling. Through an in-depth analysis encompassing spectroscopic features, surface texture, and porosity, it is found that the MOFs' cooling efficacy is largely influenced by their optical bandgaps and functional groups, although other factors like chemical composition and structural characteristics remain to be considered. Notably, UiO-66(Zr) emerged as the standout performer, boasting an impressive solar reflectance of 91% and a mid-infrared emissivity of 96.8%. Remarkably, a fabric treated with UiO-66(Zr) achieved a substantial sub-ambient cooling effect, lowering temperatures by up to 5 °C and delivering a cooling power of 26 W m at 300 K. The findings underscore the vast potential of MOFs in offering new opportunities to advance passive radiative cooling technologies, paving the way for their extensive application in this field.
被动辐射冷却代表了一种在不依赖能源消耗的情况下实现地球上可持续冷却的变革性方法。在这项研究中，对五种易于获取的金属有机框架（MOF）：ZIF-67（钴）、MOF-74（镍）、HKUST-1（铜）、MOF-801（锆）和UiO-66（锆）的光学特性进行了细致探索。目的是确定影响它们促进辐射冷却能力的关键因素。通过涵盖光谱特征、表面纹理和孔隙率的深入分析发现，MOF的冷却效果在很大程度上受其光学带隙和官能团影响，尽管诸如化学成分和结构特征等其他因素仍有待考虑。值得注意的是，UiO-66（锆）表现突出，其太阳反射率高达91%，中红外发射率为96.8%。引人注目的是，用UiO-66（锆）处理过的织物实现了显著的低于环境温度的冷却效果，在300K时温度降低高达5°C，冷却功率为26W/m。这些发现突出了MOF在为推进被动辐射冷却技术提供新机会方面的巨大潜力，为其在该领域的广泛应用铺平了道路。
