SiO_(2)/TiO_(2)/PVDF-CA皮-芯纳米纤维膜的制备及其被动日间辐射冷却性能  

Preparation of a SiO_(2)/TiO_(2)/PVDF-CA sheath-core nanofiber membrane and itspassive daytime radiative cooling performance

作　　者：刘维超 郭威阳 宋立新[1,2] 熊杰[1] LIU Weichao;GUO Weiyang;SONG Lixin;XIONG Jie(College of Textile Science and Engineering,Zhejiang Sci-Tech University,Hangzhou 310018,China;Shaoxing Keqiao Research Institute of Zhejiang Sci-Tech University,Shaoxing 312030,China)

机构地区：[1]浙江理工大学纺织科学与工程学院,杭州310018 [2]浙江理工大学绍兴柯桥研究院,浙江绍兴312030

出　　处：《现代纺织技术》2025年第1期110-117,共8页Advanced Textile Technology

基　　金：浙江理工大学绍兴柯桥研究院基础科研资金项目(KYY2022003C)。

摘　　要：为了实现被动日间辐射冷却,减少能源消耗,采用同轴静电纺丝制备SiO_(2)/TiO_(2)/PVDF(聚偏氟乙烯)-CA(醋酸纤维素)皮-芯复合纳米纤维膜。通过SEM、XRD和FTIR等对纤维膜的形貌、结构和性能进行表征,结果表明:SiO_(2)/TiO_(2)/PVDF-CA皮-芯纳米纤维膜的纤维平均直径为(0.395±0.032)μm,在可见光到近红外光谱范围内表现出90%的反射率,并在大气透明窗口内表现出95%的高发射率。在氙灯模拟太阳光的照射下,与棉织物、PVDF-CA皮-芯纳米纤维膜的温度相比,SiO_(2)/TiO_(2)/PVDF-CA皮-芯纳米纤维膜的温度分别降低了5℃和2.3℃。在实际阳光直射条件下,SiO_(2)/TiO_(2)/PVDF-CA皮-芯纳米纤维膜的温度相比于测试装置内部温度、棉织物和PVDF-CA皮-芯纳米纤维膜分别有2.6、7.1℃和4.2℃的最大温降值。所制备的SiO_(2)/TiO_(2)/PVDF-CA皮-芯复合纳米纤维膜具有良好的降温能力,有望用于体表热管理。This study proposes a design scheme of SiO_(2)/TiO_(2)/PVDF-CA sheath-core nanofiber membrane intended for the emerging passive daytime radiative cooling(PDRC).PDRC is a novel cooling technology that effectively dissipates the heat from objects by achieving a balance in radiative heat exchange,thereby lowering the temperature.Based on high solar reflectance and high and mid-infrared emissivity,this study designed an STNs/PVDF-CA sheath-core nanofiber membrane with a complex microstructure to achieve outstanding radiative cooling performance.The study began by preparing SiO_(2)/TiO_(2) nanoparticles(STNs),which exhibited high solar reflectance(90%)and mid-infrared emittance(95%)within specific ranges.It is confirmed by using TEM and XRD techniques to analyze the morphology and structure of STNs that TiO2 synthesized by hydrothermal method is coated on the surface of SiO2.Moreover,it is found that STNs have a significantly higher average reflectance in the ultraviolet to near-infrared wavelength range compared to SiO_(2).Additionally,it confirms a positive correlation between the increase in nanoparticle diameter and the peak shift of reflectance towards longer wavelengths within a certain range.Subsequently,STNs/PVDF-CA nanofiber membranes with CA as the core layer and STNs/PVDF as the sheath layer were prepared by using coaxial electrospinning.Further experiments demonstrate that embedding STNs into PVDF-CA sheath-core nanofiber membrane achieves excellent solar reflectance capabilities.Furthermore,the nanofiber membrane exhibits significant emittance within the atmospheric transparent window,providing ideal mid-infrared emission performance for PDRC.The study validates the cooling effect of the STNs/PVDF-CA sheath-core nanofiber membrane through a series of experiments,including simulated sunlight exposure and outdoor testing in high-temperature environments.The results indicate significant superiority in temperature reduction compared to cotton fabric,with a maximum cooling effect of 7.1℃.In conclusion,the ST

关 键 词：辐射制冷 个人热管理 皮芯纳米纤维膜 纳米颗粒 同轴静电纺丝 

分 类 号：TS195.5[轻工技术与工程—纺织化学与染整工程]