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- Title
Thin lamellar films with enhanced mechanical properties for durable radiative cooling.
- Authors
Xiong, Lianhu; Wei, Yun; Chen, Chuanliang; Chen, Xin; Fu, Qiang; Deng, Hua
- Abstract
Passive daytime radiative cooling is a promising path to tackle energy, environment and security issues originated from global warming. However, the contradiction between desired high solar reflectivity and necessary applicable performance is a major limitation at this stage. Herein, we demonstrate a "Solvent exchange-Reprotonation" processing strategy to fabricate a lamellar structure integrating aramid nanofibers with core-shell TiO2-coated Mica microplatelets for enhanced strength and durability without compromising optical performance. Such approach enables a slow but complete two-step protonation transition and the formation of three-dimensional dendritic networks with strong fibrillar joints, where overloaded scatterers are stably grasped and anchored in alignment, thereby resulting in a high strength of ~112 MPa as well as excellent environmental durability including ultraviolet aging, high temperature, scratches, etc. Notably, the strong backward scattering excited by multiple core-shell and shell-air interfaces guarantees a balanced reflectivity (~92%) and thickness (~25 μm), which is further revealed by outdoor tests where attainable subambient temperature drops are ~3.35 °C for daytime and ~6.11 °C for nighttime. Consequently, both the cooling capacity and comprehensive outdoor-services performance, greatly push radiative cooling towards real-world applications. Practical application of radiative cooling technology in harsh outdoor conditions remains challenging. Here, the authors develop a lamellar ANFs/Mica@TiO2 composite via a "solvent exchange-reprotonation" process enabling durable outdoor cooling.
- Subjects
THIN films; COOLING; MULTIPLE scattering (Physics); GLOBAL warming; HIGH temperatures
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-41797-3