Yu Xi, Li Yang, Wang Xianfeng, Si Yang, Yu Jianyong, Ding Bin
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Textiles, Donghua University, Shanghai 201620, China.
Innovation Center for Textile Science and Technology, Donghua University, Shanghai 200051, China.
ACS Appl Mater Interfaces. 2020 Jul 15;12(28):32078-32089. doi: 10.1021/acsami.0c04486. Epub 2020 Jul 1.
Space cooling occupies a large portion of total building energy consumption, aggravating the energy crisis and restricting human sustainable development, thus an efficient and energy-saving personal cooling technology is in high demand. Recently, thermally conductive fillers, such as boron nitride (BN), are usually enriched to fibrous materials to construct thermal management textiles. However, these fabrication processes are complex and time-consuming, and the resultant materials fail to transmit moisture and resist liquid water. Herein, we develop a facile and scalable methodology to construct highly thermoconductive breathable superhydrophobic nanofibrous membranes to enhance the thermal management of textiles for personal cooling. The strategy causes boron nitride (BN) to be linked with each other along nanofibers, and thus the membranes contain well interpenetrated BN network and remain porous structure simultaneously, improving their thermal conductivity without sacrificing the moisture permeability. In addition, the membranes possess good resistance to water penetration and intriguing superhydrophobicity due to the synergistic effect of the hydrophobic polymeric matrix and improved roughness. As a consequence, the resultant membranes demonstrate outstanding hybrid active-passive cooling performance with ultrahigh in-plane thermal conductivity of 17.9 W m K, cross-plane thermal conductivity of 0.29 W m K, and high water vapor transmission (WVT) rate of 11.6 kg m day, as well as excellent water repellency with water contact angle of 153° and high hydrostatic pressure of 32 kPa, indicating promising utility for the next generation of cooling fabrics.
空间制冷在建筑总能耗中占很大比例，加剧了能源危机并限制了人类的可持续发展，因此对高效节能的个人制冷技术需求迫切。最近，诸如氮化硼（BN）之类的导热填料通常被添加到纤维材料中以构建热管理纺织品。然而，这些制造工艺复杂且耗时，并且所得材料无法传导水分和抵抗液态水。在此，我们开发了一种简便且可扩展的方法来构建高导热透气超疏水纳米纤维膜，以增强用于个人制冷的纺织品的热管理。该策略使氮化硼（BN）沿纳米纤维相互连接，因此这些膜包含相互贯穿良好的BN网络并且同时保持多孔结构，在不牺牲透湿性的情况下提高了它们的热导率。此外，由于疏水性聚合物基体和改善的粗糙度的协同作用，这些膜具有良好的抗水渗透性能和引人注目的超疏水性。结果，所得的膜表现出出色的混合主动 - 被动冷却性能，面内热导率高达17.9 W m⁻¹ K⁻¹，横向热导率为0.29 W m⁻¹ K⁻¹，高水蒸气透过率（WVT）为11.6 kg m⁻² day⁻¹，以及具有153°的水接触角和32 kPa的高静水压的优异拒水性，表明其在下一代冷却织物中具有广阔的应用前景。
