Porous block copolymer films with self-adjustable optical transmittance and passive radiative cooling  

作　　者：Xue Meng Weiming Tang Shuyun Zhuo Jince Zhao Zixuan Ren Zhonghe Sun Hao Yan Tianyi Zhao Ziguang Zhao Mingjie Liu 

机构地区：[1]School of Future Technology,University of Chinese Academy of Sciences,Beijing 100049,China [2]Key Laboratory of Bio-Inspired Smart Interfacial,Science and Technology of Ministry of Education,School of Chemistry,Beihang University,Beijing 100191,China

出　　处：《Nano Research》2024年第9期8472-8478,共7页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.22161142021,22175010,and 22275183).

摘　　要：As an energy-free cooling technique,radiative cooling has garnered significant attention in the field of energy conservation.However,traditional radiative cooling films often possess static optical properties and their inherent opacity limits their applications in building such as windows.Therefore,there exists a requirement for passive radiative cooling films endowed with adjustable transmittance.Here we report the porous block copolymer films with self-adjustable optical transmittance and passive radiative cooling.In a result,the film exhibited a high solar reflectance(0.3-2.5μm)of 96.9%and a high infrared emittance(8-13μm)of 97.9%.Outdoor experiments demonstrated that the film surface temperature was 6.6℃lower than ambient temperature,with a cooling power of 104.8 W·m^(-2).In addition,the film’s transmittance can be regulated by altering the polarity of the post-processing solvent,providing an effective approach for regulating indoor light intensity and thermal balance,thereby enhancing the applicability of radiative cooling.

关 键 词：passive radiative cooling block copolymer porous structure self-adjustable optical transmittance 

分 类 号：TL343[核科学技术—核技术及应用]