Two-Dimensional Nanofibrous Networks by Superspreading-Based Phase Inversion for High-Efficiency Separation

作者：Ming Yang, Xiaobao Gong, Sai Wang, Yucheng Tian, Xia Yin, Xianfeng Wang, Jianyong Yu, Shichao Zhang, Bin Ding · 发表于：Nano Letters · 年份：2023 · DOI：10.1021/acs.nanolett.3c03486 · 被引用次数：18 · 研究领域：Surface Modification and Superhydrophobicity、Solar-Powered Water Purification Methods、Aerosol Filtration and Electrostatic Precipitation

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 0.3 removal) and water purification (microfiltration level). This creation of such attractive 2D fibrous nanomaterials can pave the way for versatile high-performance separation applications.