Independent dual-responsive Janus chromic fibers  

独立双响应Janus变色纤维

作　　者：Yanfang Wei Wei Zhang Chengyi Hou Qinghong Zhang Yaogang Li Hongzhi Wang 位艳芳;张伟;侯成义;张青红;李耀刚;王宏志(State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201600,China;Engineering Research Center of Advanced Glasses Manufacturing Technology,College of Materials Science and Engineering,Donghua University,Shanghai 201600,China)

机构地区：[1]State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201600,China [2]Engineering Research Center of Advanced Glasses Manufacturing Technology,College of Materials Science and Engineering,Donghua University,Shanghai 201600,China

出　　处：《Science China Materials》2021年第7期1770-1779,共10页中国科学（材料科学（英文版）

基　　金：supported by the Fundamental Research Funds for the Central Universities(2232019G-02 and2232019A3-02);Donghua University Distinguished Young Professor Program(LZB2019002);Shanghai Rising-Star Program(20QA1400300)。

摘　　要：Daily exposure under solar ultraviolet(UV)and infrared(IR)is prone to cause skin cancer and photoaging.Real-time monitoring of the environmental UV index and IR radiation temperature during outdoor activities can enhance awareness and strengthen personal protection.It is a challenge to design flexible,wearable devices(with measurement capabilities)that can be integrated with apparels.Here,microfluidic spinning technology(MST)was used for the continuous and large-scale fabrication of eco-friendly coresheath Janus fibers with a well-defined axially symmetric Janus core.One side of the core was sensitive to UV light and the opposite was sensitive to IR radiation.Textiles woven with Janus fibers showed excellent independent reversible color responses to dual-wavelength stimulation.Such textiles switched among four colors under UV and IR irradiation,both individually and in combination.The color gradient of the textiles changed significantly with increasing UV intensity(UV index).After 60 cycles of UV/IR stimulation and 50 washes,the change rate of the comprehensive chromatic aberration(ΔE_(ab)^(*))of the textiles under different conditions was only 0.42%-4.71%.This was attributed to the unique structure of the fibers.The three-line striped textiles demonstrated the potential of the fibers to be used as wearable energy-free realtime visual monitors of the UV index and IR radiation temperature.在户外活动中,频繁暴露于太阳紫外线和红外辐射下皮肤容易发生癌变和老化.对环境中的紫外线强度和红外辐射进行实时监测有益于增强个人防护.设计可与服装集成且兼具监测功能的光响应材料与柔性器件是一项挑战.本文中,我们利用微流控纺丝技术实现了具有轴向对称性皮芯结构Janus变色纤维的连续化制备.芯层材料双侧分别对紫外和红外波段光敏感.用Janus纤维编织的纺织品对紫外/红外双波段刺激具有独立可逆的变色响应,使得纤维能够在四种颜色间切换.纺织品的颜色能随着光照强度的改变发生显著的梯度变化.由于皮层的保护作用,经过60次紫外/红外刺激或50次洗涤后,纺织品的综合色差(ΔE_(ab)^(*))变化率仅为0.42%-4.71%.我们设计的三线条纹纺织品展示出该纤维可以用作紫外线指数和红外辐射的可穿戴式无能耗、实时、可视化监测.

关 键 词：microfluidic spinning UV index IR radiation temperature dual-wavelength response core-sheath Janus fibers 

分 类 号：TQ342[化学工程—化纤工业]