Department of Polymer Science and Engineering, School of Chemical Engineering , Nanjing University of Science and Technology , Nanjing 210094 , PR China.
College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering , Sichuan University , Chengdu 610065 , PR China.
ACS Appl Mater Interfaces. 2019 Oct 30;11(43):40685-40693. doi: 10.1021/acsami.9b15612. Epub 2019 Oct 17.
Personal cooling technology using functional clothing that could provide localized thermal regulation instead of cooling the entire space is regarded as a highly anticipated strategy to not only facilitate thermal comfort and human health but also be energy-saving and low-cost. The challenge is how to endow textiles with prominent cooling effect whenever the wearer is motionless or sportive. In this study, high content of edge-selective hydroxylated boron nitride nanosheets (BNNSs) up to 60 wt % was added into a biodegradable cellulose/alkaline/urea aqueous solution, and then regenerated cellulose (RCF)/BNNS multifilaments were successfully spun in a simple, low-cost, and environmentally friendly process, which was demonstrated to serve as both static and dynamic personal cooling textile. Typically, excellent axial thermal conductivity of RCF/BNNS filament rendered that body-generated heat could directly escape from skin to the outside surface of the textile by means of thermal conduction, achieving a much better static personal cooling result through continuous thermal radiation. Besides, synergistic effect between excellent heat dissipation capability and good hygroscopicity also resulted in much better dynamic cooling effect once the wearer is doing some sports, whose efficiency was even better than commercial hygroscopic textiles such as cotton and RCF.
利用功能服装进行个人冷却技术，通过局部热调节来代替整个空间的冷却，被认为是一种备受期待的策略，不仅可以促进热舒适性和人体健康，而且还具有节能和低成本的特点。挑战在于如何在穿着者静止或运动时为纺织品赋予突出的冷却效果。在这项研究中，高达 60wt%的高含量边缘选择性羟基化氮化硼纳米片（BNNS）被添加到可生物降解的纤维素/堿/尿素水溶液中，然后通过简单、低成本和环保的工艺成功纺制了再生纤维素（RCF）/BNNS 复丝，可作为静态和动态个人冷却纺织品。通常情况下，RCF/BNNS 纤维的优异轴向热导率使得人体产生的热量可以通过热传导直接从皮肤逸出到纺织品的外表面，从而通过连续热辐射实现更好的静态个人冷却效果。此外，散热能力优异和吸湿性良好之间的协同效应也使得穿着者运动时具有更好的动态冷却效果，其效率甚至优于棉和 RCF 等商业吸湿纺织品。
