论文标题
自我清洁和自冷纸
Self-cleaning and self-cooling paper
论文作者
论文摘要
被动日间辐射冷却（PDRC）的技术通过同时反射阳光并通过地球大气窗向冷辐射到冷的外层空间来冷却物体。但是，对于实际应用，当前的PDRC材料面临着前所未有的挑战，例如复杂且昂贵的制造方法以及表面污染引起的性能退化。在这里，我们通过散布空气的乙醇聚氟乙烯（PTFE）微颗粒悬浮液，开发具有出色的自我清洁和自冷的能力，具有出色的自我清洁和自冷的能力。形成的超疏水PTFE涂层不仅可以保护纸张免受现实应用的水润湿和灰尘污染，而且还可以通过阳光反向散射增强其太阳反射率。 The paper fibers, when enhanced with PTFE particles, efficiently reflect sunlight and strongly radiate heat through the atmospheric window, resulting in a sub-ambient cooling performance of 5$^{\circ}$C and radiative cooling power of 104 W/m$^2$ under direct solar irradiance of 834 W/m$^2$ and 671 W/m$^2$, respectively.冷却纸的自我清洁表面延长其寿命，并保持其室外应用的良好冷却性能。此外，对染色的论文进行了实验研究，以进行广泛的工程应用。它们可以吸收合适的可见波长以显示特定的颜色，并有效地反射近红外的灯光以减少太阳能加热，从而以具有成本效益，可扩展和能效的方式同步实现有效的辐射冷却和美学品种。
The technique of passive daytime radiative cooling (PDRC) is used to cool an object down by simultaneously reflecting sunlight and thermally radiating heat to the cold outer space through the Earth's atmospheric window. However, for practical applications, current PDRC materials are facing unprecedented challenges such as complicated and expensive fabrication approaches and performance degradation arising from surface contamination. Here, we develop a scalable paper-based material with excellent self-cleaning and self-cooling capabilities, through air-spraying ethanolic polytetrafluoroethylene (PTFE) microparticles suspensions embedded within the micropores of the paper. The formed superhydrophobic PTFE coating not only protects the paper from water wetting and dust contamination for real-life applications but also reinforces its solar reflectance by sunlight backscattering. The paper fibers, when enhanced with PTFE particles, efficiently reflect sunlight and strongly radiate heat through the atmospheric window, resulting in a sub-ambient cooling performance of 5$^{\circ}$C and radiative cooling power of 104 W/m$^2$ under direct solar irradiance of 834 W/m$^2$ and 671 W/m$^2$, respectively. The self-cleaning surface of the cooling paper extends its lifespan and keep its good cooling performance for outdoor applications. Additionally, dyed papers are experimentally studied for broad engineering applications. They can absorb appropriate visible wavelengths to display specific colors and effectively reflect near-infrared lights to reduce solar heating, which synchronously achieves effective radiative cooling and aesthetic varieties in a cost-effective, scalable, and energy-efficient way.
