ZnO掺杂MgHPO4·0.78H2O涂层用于日间辐射冷却研究
ZnO doped MgHPO4·0.78H2O coating for daytime radiation cooling research
蒋周程 1陶宇 1罗松 1苏青 1黄霞1
作者信息
- 1. 四川轻化工大学材料科学与工程学院,四川 自贡 643000
- 折叠
摘要
物体以热辐射的方式通过大气窗口(8-13 μm)与外太空(～3 K)进行能量交换,这为 日间辐射提供了可能性.以无水氯化镁作为镁源,焦磷酸钠作为磷源,氧化锌作为锌源,采用两步水热合成法合成ZnO掺杂的MgHPO4·0.78H2O粉体,再以聚乙烯醇(PVA)作为成膜剂制备出ZnO掺杂的MgHPO4·0.78H2O的辐射制冷涂层,研究涂层的日间辐射冷却性能.结果表明,Mg∶P∶ZnO摩尔比为1∶1∶0.5的粉体对太阳光谱平均反射率高达93％,大气窗口(8～13 μm)平均发射率为91％,较未掺杂ZnO的MgHPO4·0.78H2O粉体太阳光谱(0.3～2.5 μm)反射率提高了 3％,近红外(0.76～2.5 μm)反射率提高了 7％.0.5-Zn O涂层在高湿地区可实现低于环境空气温度3 ℃的日间辐射冷却,这为辐射制冷涂层在高湿地区的应用提供了 一定的参考.
Abstract
Objects can radiate emission of heat to outer empty space(～3 K)through an atmospheric window(8-13 μm),resulting in a possibility for radiative cooling.In this paper,ZnO doped MgHPO4·0.78H2O powder was synthesized by two-step hydrothermal synthesis method with anhydrous magnesium chloride as magnesium source,sodium pyrophosphate as phosphorus source and zinc oxide as zinc source.Then,ZnO doped MgHPO4·0.78H2O radiative cooling coating was prepared with polyvinyl alcohol(PVA)as film forming agent.The day-time radiative cooling performance of the coating was studied.The results indicate that Mg∶P∶ZnO powder with molar ratio of 1∶1∶0.5 powder has a high reflectance of 93％in the solar spectral region of 0.3-2.5 μm and a high emissivity of 0.91 in the atmospheric window of 8-13 μm.Compared with the undoped ZnO powder,the solar spectral(0.3-2.5 μm)and near-infrared reflectivity(0.76-2.5 μm)are increased by 3％and 7％respective-ly.In the high humidity area,0.5-ZnO coating could achieves a daytime radiative cooling of 3 ℃ below the am-bient air temperature,providing valuable references for its application of radiative cooling coating in the high humidity area.
关键词
ZnO/掺杂/MgHPO4·0.78H2O/反射率/发射率/日间辐射制冷Key words
ZnO/doping/MgHPO4·0.78H2O/reflectivity/emissivity/daytime radiative cooling引用本文复制引用
基金项目
自贡市省级转移支付科技计划(2021SZYZF02)
出版年
2024
NETL
NSTL
万方数据