Li He, Che Keyi, Jiang Pan, Yin Fei, Li Zhaoling, Wang Xianfeng, Yu Jianyong, Zhang Shichao, Ding Bin
Innovation Center for Textile Science and Technology, College of Textiles, Donghua University, Shanghai 200051, China.
School of Materials Science and Engineering, Shanghai University of Engineering Science, Shanghai 201620, China.
Nano Lett. 2024 Oct 2. doi: 10.1021/acs.nanolett.4c02954.
High-performance separation materials for oil-water emulsions are crucial to environmental protection and resource recovery; however, most existing fibrous separation materials are subject to large pore size and low porosity, resulting in limited separation performance. Herein, we create high-performance membranes consisting of spherical-beaded nanofibers and nanoarchitectured networks (nano-nets) using electrostatic spinning/netting technology, for water-in-oil emulsion separation. By manipulating the nonequilibrium stretching of jets, spherical-beaded nanofibers capable of generating a robust microelectric field are fabricated as scaffolds, on which charged droplets are induced to eject and phase separate to self-assemble nano-nets with small pores. Benefiting from 3D undulating networks with cavities originating from 2D nano-nets supported by 1D spherical-beaded nanofibers, the membranes exhibit under-oil superhydrophobicity (>152°), a striking separation performance with an efficiency of >99.2% and a flux of 5775 L m h, together with wide pressure applicability, antifouling, and reusability. This work may open up new horizons in developing fibrous materials for separation and purification.
用于油水乳液的高性能分离材料对环境保护和资源回收至关重要；然而，大多数现有的纤维分离材料存在孔径大、孔隙率低的问题，导致分离性能有限。在此，我们利用静电纺丝/编织技术制备了由球形珠状纳米纤维和纳米结构网络（纳米网）组成的高性能膜，用于油包水乳液分离。通过控制射流的非平衡拉伸，制备出能够产生强大微电场的球形珠状纳米纤维作为支架，在其上诱导带电液滴喷出并相分离，以自组装形成具有小孔的纳米网。得益于由一维球形珠状纳米纤维支撑的二维纳米网产生的具有空腔的三维起伏网络，该膜表现出油下超疏水性（>152°）、显著的分离性能，效率>99.2%，通量为5775 L m⁻² h⁻¹，同时具有宽压力适用性、抗污染性和可重复使用性。这项工作可能为开发用于分离和纯化的纤维材料开辟新的视野。
