Radiative cooling materials can cool terrestrial objects without any energy input but are susceptible to rain wetting and dust contamination, which affects badly their cooling characteristics. Herein, this work fabricated a radiative cooling porous film with superhydrophobic self-cleaning properties using poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) and poly(vinylidene fluoride) (PVDF). The PVDF-HFP/PVDF film consists of micropores with nanoparticles both inside and at the surface. The micro/nanostructures enhanced the scattering of solar light, which in combination with the infrared emissivity of both PVDF-HFP and PVDF polymers makes the film show excellent radiative cooling ability with a sub-ambient temperature drop of 16°C. The micro/nanostructures roughened the surface of the film, which in combination with the low surface energy property of both PVDF-HFP and PVDF polymers endows the film with superhydrophobic self-cleaning properties. The self-cleaning function defends the film from contamination and maintains sustainable radiative cooling for lasting applications. The integration of cooling and self-cleaning into a film paves the way for multifunctional and long-life radiative cooling materials.

中文翻译：

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超疏水自清洁辐射散热膜的制备

辐射制冷材料可以在没有任何能量输入的情况下对地面物体进行降温，但容易受到雨水浸湿和灰尘污染，严重影响其制冷特性。在此，这项工作使用聚（偏二氟乙烯）制备了具有超疏水自清洁性能的辐射冷却多孔膜。-六氟丙烯）（PVDF-HFP）和聚（偏二氟乙烯）（PVDF）。PVDF-HFP/PVDF 薄膜由内部和表面均带有纳米粒子的微孔组成。微/纳米结构增强了太阳光的散射，这与 PVDF-HFP 和 PVDF 聚合物的红外发射率相结合，使薄膜显示出出色的辐射冷却能力，温度可下降 16°C。微/纳米结构使薄膜表面粗糙，结合 PVDF-HFP 和 PVDF 聚合物的低表面能特性，赋予薄膜超疏水自清洁性能。自清洁功能可保护薄膜免受污染，并为持久应用保持可持续的辐射冷却。