空气中大量携载细菌和病毒等烟尘颗粒，对人民群众生命造成严重威胁。具有相互连贯孔结构的静电纺丝纳米纤维膜在空气净化领域展示出巨大的应用前景。石油基合成纤维不可再生和资源渐趋枯竭，环境友好、可降解海藻基纳米纤维符合当今绿色发展理念。海藻酸钠（SA）分子链半刚性以及链间强静电排斥导致有效链缠结不足，电纺SA溶液还存在很大的挑战。我们前期基于溶液物化性质研究，利用柔性的高分子、助溶剂和表面活性剂的协同作用，提高了分子链的缠结，制备了高SA比例纤维膜。表面光滑、堆积结构单一、致密纤维膜限制了应用，如何获得高效低阻、多功能性SA纳米纤维膜是研究的重点。受自然界生物材料结构启发，本项目拟以仿生原理，设计和调控具有串珠、蛛网和复合结构纳米纤维膜方法，阐明多级结构形成机理；明确纤维结构与过滤性能的构效关系；引入功能性纳米粒子，制备多功能性的复合纤维，开发具有高效低阻、功能性纳米纤维膜，以期获得更广泛的应用。

A large number of dust particles carrying bacteria and viruses in the air pose a serious threat to people's lives. Nanofiber membrane has showed great potentials in air purification due to its interconnected nanoscale pore structures. Petroleum based synthetic fibers are non-renewable and resources are gradually exhausted. Environmentally friendly and degradable algal based nanofibers are in line with the concept of green development. Electrospinning of alginate (SA) solution is still a severe challenge because the rigid worm-like chain conformations and strong electrostatic repulsion of SA lead to the isolation of chains without sufficient chain entanglement. Based on the study of physicochemical properties of solution, synergistic regulation by cosolvent, nonionic surfactants, and polyethylene oxide is employed to realize electrospinning of SA nanofibers with higher alginate to date. The smooth surface, single stacking structure and compact nanofiber membrane limit the application. High efficiency, low resistance and functionalization will be the key points for nanofiber membrane in air purification. Inspired by nature, strong, tough and flexible synthetic hierarchical materials are constantly being synthesized. We will develop many kinds of hierarchical organic, hybrid organic/inorganic fiber materials, such as bead-on-string, nanofiber/nets and composite, to point out the formation mechanism of hierarchical structures. Meanwhile, we also investigated the filtering mechanism of electrospun hierarchical structures fiber for fine particles to provide theoretical support for their practical application. By introducing functional nanoparticles, it is expected that nanofibrous air purification membrane with multifunction will gain more and more applications in the future.