Cai Xuan, Wang Yutao, Luo Yumin, Xu Jingyu, Zhao Liang, Lin Yiyi, Ning Yin, Wang Jizhuang, Gao Liang, Li Dan
College of Chemistry and Materials Science, Jinan University, Guangzhou 510632, P. R. China.
Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, Jinan University, Guangzhou 510632, P. R. China.
ACS Appl Mater Interfaces. 2022 Jun 15;14(23):27222-27232. doi: 10.1021/acsami.2c05943. Epub 2022 Jun 3.
The all-day passive radiative cooler has emerged as one of the state-of-the-art energy-saving cooling tool kits but routinely suffers from limited processability, high cost, and complicated fabrication processes, which impede large-scale applications. To address these challenges, this work exploits a polymer-based passive radiative cooler with optimized turbidity, reconfigurability, and recyclability. These cooling membranes are fabricated selective condensation of octyl side chain-modified polyvinyl alcohol through a non-solvent-induced phase separation method. The rational tuning over spatial organization and distribution of the air-polymer interface renders optimized bright whiteness with solar reflectance at 96%. Meanwhile, the abundant -C-O-C- bonds endow such membranes with infrared thermal emittance over 90%. The optimized membrane realizes a subambient cooling of ∼5.7 °C with an average cooling power of ∼81 W m under a solar intensity of ∼528 W m. Furthermore, the supramolecule nature of the developed passive radiative cooling membrane bears enhanced shape malleability and recyclability, substantially enhancing its conformability to the complex geometry and extending its life for an eco-friendly society.
全天候被动辐射冷却器已成为最先进的节能冷却工具之一，但通常存在加工性有限、成本高和制造工艺复杂等问题，这阻碍了其大规模应用。为应对这些挑战，本研究开发了一种具有优化浊度、可重构性和可回收性的聚合物基被动辐射冷却器。这些冷却膜是通过非溶剂诱导相分离法对辛基侧链改性聚乙烯醇进行选择性缩合制备的。对空气-聚合物界面的空间组织和分布进行合理调控，可实现优化的亮白色，太阳能反射率达96%。同时，丰富的-C-O-C-键使此类膜的红外热发射率超过90%。在约528 W m的太阳强度下，优化后的膜实现了约5.7 °C的亚环境冷却，平均冷却功率约为81 W m。此外，所开发的被动辐射冷却膜的超分子性质具有增强的形状延展性和可回收性，大大提高了其对复杂几何形状的适应性，并为生态友好型社会延长了其使用寿命。
