Extreme cold weather seriously harms human thermoregulatory system,necessitating high-performance insulating garments to maintain body temperature.However,as the core insulating layer,advanced fibrous materials always...Extreme cold weather seriously harms human thermoregulatory system,necessitating high-performance insulating garments to maintain body temperature.However,as the core insulating layer,advanced fibrous materials always struggle to balance mechanical properties and thermal insulation,resulting in their inability to meet the demands for both washing resistance and personal protection.Herein,inspired by the natural spring-like structures of cucumber tendrils,a superelastic and washable micro/nanofibrous sponge(MNFS)based on biomimetic helical fibers is directly prepared utilizing multiple-jet electrospinning technology for high-performance thermal insulation.By regulating the conductivity of polyvinylidene fluoride solution,multiple-jet ejection and multiple-stage whipping of jets are achieved,and further control of phase separation rates enables the rapid solidification of jets to form spring-like helical fibers,which are directly entangled to assemble MNFS.The resulting MNFS exhibits superelasticity that can withstand large tensile strain(200%),1000 cyclic tensile or compression deformations,and retain good resilience even in liquid nitrogen(-196℃).Furthermore,the MNFS shows efficient thermal insulation with low thermal conductivity(24.85 mW m^(-1)K^(-1)),close to the value of dry air,and remains structural stability even after cyclic washing.This work offers new possibilities for advanced fibrous sponges in transportation,environmental,and energy applications.展开更多
随着科技的进步,兼具防水透湿与辐射制冷功能的膜材料在高温高湿环境下的人体防护领域展现出巨大的应用潜力。采用醇溶性聚酰胺6和含氟疏水剂为原料,通过一步静电纺丝技术成功制备了具有优异防护性能和热管理性能的微纳米纤维膜。研究...随着科技的进步,兼具防水透湿与辐射制冷功能的膜材料在高温高湿环境下的人体防护领域展现出巨大的应用潜力。采用醇溶性聚酰胺6和含氟疏水剂为原料,通过一步静电纺丝技术成功制备了具有优异防护性能和热管理性能的微纳米纤维膜。研究了疏水剂浓度对纤维膜的微观结构、表面化学、防水性、透湿性以及辐射制冷性能的影响。在疏水剂浓度为35 wt%时,所制备的纤维膜耐静水压为32.1 kPa,透湿通量高达11.14 kg m^(-2)d^(-1),同时,该纤维膜具有91.4%的太阳光平均反射率和在“大气窗口”波段高达91.98%的平均发射率,能够在阳光直射条件下实现环境温度降低8~11℃,可显著提升工作者的安全性和舒适性。不仅为多功能纤维材料的制备提供了新方法,也为高温高湿环境下人体防护材料的研发与应用提供了重要参考。展开更多
基金supported by Young Elite Scientists Sponsorship Program by China Association for Science and Technology(No.2022QNRC001)the National Natural Science Foundation of China(No.52273053)the Chenguang Program of Shanghai Education Development Foundation and Shanghai Municipal Education Commission(No.21CGA41)。
文摘Extreme cold weather seriously harms human thermoregulatory system,necessitating high-performance insulating garments to maintain body temperature.However,as the core insulating layer,advanced fibrous materials always struggle to balance mechanical properties and thermal insulation,resulting in their inability to meet the demands for both washing resistance and personal protection.Herein,inspired by the natural spring-like structures of cucumber tendrils,a superelastic and washable micro/nanofibrous sponge(MNFS)based on biomimetic helical fibers is directly prepared utilizing multiple-jet electrospinning technology for high-performance thermal insulation.By regulating the conductivity of polyvinylidene fluoride solution,multiple-jet ejection and multiple-stage whipping of jets are achieved,and further control of phase separation rates enables the rapid solidification of jets to form spring-like helical fibers,which are directly entangled to assemble MNFS.The resulting MNFS exhibits superelasticity that can withstand large tensile strain(200%),1000 cyclic tensile or compression deformations,and retain good resilience even in liquid nitrogen(-196℃).Furthermore,the MNFS shows efficient thermal insulation with low thermal conductivity(24.85 mW m^(-1)K^(-1)),close to the value of dry air,and remains structural stability even after cyclic washing.This work offers new possibilities for advanced fibrous sponges in transportation,environmental,and energy applications.
文摘随着科技的进步,兼具防水透湿与辐射制冷功能的膜材料在高温高湿环境下的人体防护领域展现出巨大的应用潜力。采用醇溶性聚酰胺6和含氟疏水剂为原料,通过一步静电纺丝技术成功制备了具有优异防护性能和热管理性能的微纳米纤维膜。研究了疏水剂浓度对纤维膜的微观结构、表面化学、防水性、透湿性以及辐射制冷性能的影响。在疏水剂浓度为35 wt%时,所制备的纤维膜耐静水压为32.1 kPa,透湿通量高达11.14 kg m^(-2)d^(-1),同时,该纤维膜具有91.4%的太阳光平均反射率和在“大气窗口”波段高达91.98%的平均发射率,能够在阳光直射条件下实现环境温度降低8~11℃,可显著提升工作者的安全性和舒适性。不仅为多功能纤维材料的制备提供了新方法,也为高温高湿环境下人体防护材料的研发与应用提供了重要参考。
