Bacterial Cellulose-Based Janus Films with Radiative Cooling and Solar Heating Properties for All-Season Thermal Management
作者机构：School of Materials Science and EngineeringTianjin UniversityTianjin300350 China Tianjin Key Laboratory of Composite and Functional MaterialsTianjin300350 China
出 版 物：《Chinese Journal of Chemistry》 (中国化学（英文版）)
年 卷 期：2023年第41卷第20期
页 面：2611-2618页
核心收录：
学科分类：08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0701[理学-数学]
基 金：This work was financially supported by the National Natural Science Foundation of China(Nos.52173181 and 51973155) Natural Science Foundation of Tianjin City(20JCYBJC00810) Key Program of National Natural Science Foundation of China(No.52130303) National KeyR&D Program of China(2022YFB3805702)
主 题：Bacterial cellulose MXene nanosheets Radiative cooling Solar heating Thermal management Nanostructures Nanoparticles Thin films
摘 要：Advanced radiative cooling materials with both heating and cooling mode is of pivotal importance for all-season energy-saving in *** this work,we report the design and fabrication of bacterial cellulose-based Janus films(J-BC)with radiative cooling and solar heating properties,which were developed by two-step vacuum-assisted filtration of modified MXene-doped bacterial cellulose and modified silicon nitride(Si_(3)N_(4))-doped bacterial cellulose,followed by hot-pressing and drying *** as-prepared J-BC films show a unique Janus structure where modified MXene nanosheets and cellulose nanofibers are on the bottom surface,and modified silicon nitride(Si_(3)N_(4))nanoparticles and cellulose nanofibers are on the top *** radiative cooling effect of J-BC films is enabled by the Si_(3)N_(4)-doped bacterial cellulose due to the high mid-infrared emissivity of Si_(3)N_(4) nanoparticles,which shows a high solar reflection of~98.1%and high emissivity of~93.6%in the atmospheric transparency window(8-13μm).Thanks to the enhanced photothermal conversion of the modified MXene nanosheets,a reduced solar reflection(6.6%)and relatively low thermal emissivity in the atmospheric window(71.4%)are achieved,making sure the solar heating effect of J-BC *** the outdoor tests,J-BC films achieve a sub-ambient temperature drop of~3.8°C and an above-ambient temperature rise of~14.2°*** prediction demonstrated that the J-BC films with dual modes have great potential of all-season energy saving for buildings and a corresponding energy-saving map in China is also *** work disclosed herein can provide an avenue for the shaping of advanced radiative cooling materials for emerging applications of personal thermal management,sustainable energy-efficient buildings,and beyond.
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