辐射制冷纤维素织物的制备及性能研究

Study on Preparation and Properties of Radiative Cooling Cellulose Textiles

关键词:  纤维素织物  纳米二氧化硅  辐射制冷  环境友好

Key Words:cellulose textile  nano-SiO₂  radiative cooling  environmentally friendly

摘要:采用喷涂方式在纤维素织物（CT）表面负载纳米二氧化硅（SiO₂）颗粒，进而制备辐射制冷纤维素织物（SiO₂-CT）。纳米SiO₂可以提升CT的表面粗糙度，形成大量的光散射中心，进而提升CT的宽波段光管理能力。结果表明，SiO₂-CT在0.5~1.1 μm和1.1~2.5 μm波段的反射率分别达91%和73%。在中红外波段的发射率达0.97。SiO₂-CT展现出优异的辐射制冷效果，在中午时段可以自发降温~4.5 ℃，在夜间时段可以自发降温~6.5 ℃。

Abstract:In this study， nano-silica （SiO₂） particles were loaded on the surface of cotton cellulose textiles（CT） by a spraying method to prepare radiative cooling cellulose textiles（SiO₂-CT）. Nano-SiO₂ could improve the surface roughness of CT and form a large number of light scattering centers， thus improving the ability of CT for broad-wide management of light. The results showed that the reflectance of prepared SiO₂-CT reached 91% and 73% in the spectra of 0.5-1.1 μm and 1.1-2.5 μm， respectively， and its emissivity reached 0.97 in the mid-infrared spectra. Finally， SiO₂-CT showed an excellent radiation cooling effect， which spontaneously enabled the sub-ambient temperature of ~4.5 ℃ at noon and ~6.5 ℃ at night， respectively.