Yao Ye, Su Yazhou, Li Wenhua, Shi Lingxiang, Sun Xiaoxia
Institute of Refrigeration and Cryogenics Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
Key Laboratory of Textile Science & Technology of Ministry of Education, College of Textiles, Donghua University, Shanghai 201620, People's Republic of China.
Nanotechnology. 2023 Apr 12;34(26). doi: 10.1088/1361-6528/acc590.
The membrane-based liquid desiccant dehumidification system is a newly developed method in the field of air dehumidification. In this study, double-layer nanofibrous membranes (DLNMs) with directional vapor transport and water repellency for liquid dehumidification were fabricated by a simple electrospinning process. Specifically, the combination of thermoplastic polyurethane nanofibrous membrane and polyvinylidene fluoride (PVDF) nanofibrous membrane forms a cone-like structure in DLNMs, resulting in directional vapor transportation. The nanoporous structure and rough surface of PVDF nanofibrous membrane provide waterproof performance for DLNMs. Compare with the commercial membranes, the proposed DLNMs have a significantly higher water vapor permeability coefficient, which is as high as 539.67 g·m m·24 h·Pa. This study not only provides a new route to construct a directional vapor transport and waterproof membrane, but also demonstrates the huge application prospect of the nanofibrous membrane formed by electrospinning in the field of solution dehumidification.
基于膜的液体除湿系统是空气除湿领域新开发的一种方法。在本研究中，通过简单的静电纺丝工艺制备了具有定向蒸汽传输和拒水性能用于液体除湿的双层纳米纤维膜（DLNMs）。具体而言，热塑性聚氨酯纳米纤维膜与聚偏氟乙烯（PVDF）纳米纤维膜的组合在DLNMs中形成了一种锥状结构，从而实现了定向蒸汽传输。PVDF纳米纤维膜的纳米多孔结构和粗糙表面为DLNMs提供了防水性能。与商业膜相比，所制备的DLNMs具有显著更高的水蒸气渗透系数，高达539.67 g·m m·24 h·Pa。本研究不仅为构建定向蒸汽传输和防水膜提供了一条新途径，还展示了静电纺丝形成的纳米纤维膜在溶液除湿领域的巨大应用前景。
