SiO2-Encapsulated ZnO@ZIF-8 Coated Fabric for Passive Radiative Cooling

Materials with passive daytime radiative cooling (PDRC) have drawn more attention as a result of their potential for energy savings. We prepared SiO2-encapsulated ZnO@ZIF-8 (ZZS) particles and a radiative cooling coating containing ZZS particles. Owing to the polyhedron structure and the phonon-polarization resonance of ZZS particles, the ZZS fabric coating could reflect sunlight with 83% and radiate heat to outer space with 0.96. Compared with the ambient air, its average temperature decreased by 6.4 degrees C, and the human body under direct sunlight could avoid overheating 3.9 degrees C. In addition, the ZZS coated fabric after rubbing still had good PDRC and its average temperature increased by 1.38degree celsius higher than the original ZZS coated fabric. Owing to good PDRC property, hydrophobicity, mechanical properties and simple methods, the widespread usage of ZZS coated fabric for personal thermal management appears to be promising.