Yang Ming, Gong Xiaobao, Wang Sai, Tian Yucheng, Yin Xia, Wang Xianfeng, Yu Jianyong, Zhang Shichao, Ding Bin
Innovation Center for Textile Science and Technology, College of Textiles, Donghua University, Shanghai 201620, China.
Nano Lett. 2023 Nov 22;23(22):10579-10586. doi: 10.1021/acs.nanolett.3c03486. Epub 2023 Nov 7.
Two-dimensional (2D) nanomaterials have been widely applied as building blocks of nanoporous materials for high-precision separations. However, most existing 2D nanomaterials suffer from poor continuity and a lack of interior linking, resulting in deteriorated performance when assembled into macroscopic bulk structures. Here, a unique superspreading-based phase inversion technique is proposed to directly construct 2D nanofibrous networks (NFNs) from a polymer solution. By tailoring capillary behavior, polymer solution droplets evolve into ultrathin liquid films through superspreading; manipulating phase instability, subsequently, enables the liquid film to phase invert into continuous nanostructured networks. The assembled single-layered NFNs possess integrated structural superiorities of 1D nanoscale fiber diameter (∼40 nm) and 2D lateral infinity, exhibiting a weblike nanoarchitecture with extremely small through-pores (∼100 nm). Our NFNs show remarkable performances in air filtration (PM removal) and water purification (microfiltration level). This creation of such attractive 2D fibrous nanomaterials can pave the way for versatile high-performance separation applications.
二维（2D）纳米材料已被广泛用作纳米多孔材料的构建单元，用于高精度分离。然而，大多数现有的二维纳米材料存在连续性差和缺乏内部连接的问题，导致在组装成宏观块状结构时性能下降。在此，提出了一种独特的基于超铺展的相转化技术，以直接从聚合物溶液构建二维纳米纤维网络（NFN）。通过调整毛细管行为，聚合物溶液滴通过超铺展演变成超薄液膜；随后，控制相不稳定性使液膜相转化为连续的纳米结构网络。组装的单层NFN具有一维纳米级纤维直径（约40nm）和二维横向无限性的综合结构优势，呈现出具有极小通孔（约100nm）的网状纳米结构。我们的NFN在空气过滤（去除颗粒物）和水净化（微滤水平）方面表现出卓越性能。这种有吸引力的二维纤维纳米材料的创制可为多功能高性能分离应用铺平道路。
