摘要
将被动式辐射制冷技术应用于航天器的散热降温管理,可有效避免航天器内部器件因高温而无法正常工作的问题。以聚乙烯醇(PVA)、硅酸四乙酯(TEOS)、磷酸和去离子水为原料,采用静电纺丝法结合高温煅烧技术,制备具有辐射制冷性能的二氧化硅(SiO_(2))纤维膜,并对其室外辐射制冷效果、纤维力学性能和极端高温与紫外辐照环境下的耐用性能进行研究。结果表明:SiO_(2)纳米纤维膜具有良好的日间辐射制冷性能,最大降温幅度达17℃;具有良好的柔性,有效解决了无机纤维膜因力学性能差而易断裂的问题。在长期紫外辐照下,光谱性能未发生衰减,紫外-可见-近红外波段的反射率为94.5%,中红外波段的发射率为81.6%,在极端高温环境下其表现出长期耐用性。SiO_(2)纳米纤维膜通过辐射制冷的方式,为航天器热管理应用提供了新的可能性。
The implementation of passive radiative cooling technology in the context of spacecraft heat dissipation and cooling management has been demonstrated to be an effective strategy for averting the failure of internal spacecraft devices due to elevated temperatures.Silicon dioxide(SiO_(2))fiber membranes with radiative cooling performance were prepared by electrospinning method combined with high-temperature calcination technology using polyvinyl alcohol(PVA),tetraethyl silicate(TEOS),phosphoric acid,and deionized water as the raw materials.The outdoor radiative cooling effect,fiber mechanical properties,and durability under extreme high temperature and ultraviolet irradiation environments of the resulting membranes were tested.Findings demonstrate that the SiO_(2)nanofiber membrane possesses the capability to attain a temperature reduction below the ambient temperature during daylight,with a maximum recorded cooling range of 17℃.The fiber membrane displays a high degree of flexibility,thus effectively addressing the issue of inorganic fiber membrane breakage that is often associated with inadequate mechanical properties.In the context of prolonged UV irradiation,the spectral performance remains unattenuated,with a reflectance of 94.5%in the UV-visible-near-infrared band and an emissivity of 81.6%in the mid-infrared band.The material shows a long-term durability in extreme high-temperature environments.The SiO_(2)nanofiber membranes offer novel opportunities for the utilization of thermal management for spacecraft through radiation refrigeration.
作者
周涛
崔博
侯成义
ZHOU Tao;CUI Bo;HOU Chengyi(College of Materials Science and Engineering,Donghua University,Shanghai,China;State Key Laboratory of Advanced Fiber Materials,Donghua University,Shanghai,China;College of Physics,Donghua University,Shanghai,China)
出处
《东华大学学报(自然科学版)》
北大核心
2025年第6期150-155,共6页
Journal of Donghua University(Natural Science)
关键词
辐射制冷
极端环境
静电纺丝
二氧化硅
纤维膜
radiative cooling
extreme environment
electrostatic spinning
silicon dioxide
fiber membrane
