Gao Na, Zhang Yifan, Chen Ruizi, Zhao Yue, Li Xiao-Peng, Li Heguo, Shao Jiang, Gao Jiefeng, He Xinjian, Shi Bobo, Chen Xiaoyu, Zhang Shenghui, Xu Huan
School of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, China; State Key Laboratory of NBC Protection for Civilian, Beijing 100191, China.
School of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, China.
Int J Biol Macromol. 2025 Jun;311(Pt 4):144118. doi: 10.1016/j.ijbiomac.2025.144118. Epub 2025 May 12.
With the increasing demand for ecofriendly air filtration materials, poly(lactic acid) (PLA) nanofibrous membranes (NFMs) show significant potential for efficient air purification while evading plastic pollution. However, there is still an urgent need to solve the issues of intrinsically low electroactivity and poor electret performance for PLA. Here, we prepared MOF-functionalized core-shell beaded PLA (MCSB-PLA) gradient nanofibers at fibrous cellulose, featuring a PLA/MOF-5 composite shell layer by coaxial electrospinning. Under the action of high-voltage electric field, MOF-5 nanocrystals were ready to interact with PLA chains, prompting the generation of highly refined and electroactive nanofibers. The MCSB-PLA NFMs were characterized by ultrafine fibers (diameter decrease of 23.5 %) and MOF-triggered bead-on-string microstructures. Meanwhile, both the surface potential and dielectric constant were largely elevated for MCSB-PLA NFMs (up to 5.2 kV and 1.86, respectively), accompanied by excellent tribo-output performance (236.8 % and 161.9 % increase in output voltage and current, respectively). Given the increased electroactivity, MCSB-PLA NFMs showed high-efficiency PM filtration (93.4 %, 106 Pa, at 32 L/min), representing an increase of 12.26 % compared to pure PLA counterpart (only 83.2 %). Even under high-humidity conditions, 91.3 % removal of PM was realized by MCSB-PLA (at 90 %RH and 32 L/min). Furthermore, the self-powered mechanisms were integrated with MCSB-PLA/cellulose, permitting real-time monitoring of physiological signals. The proposed degradable and highly electroactive MCSB-PLA NFMs is highly promising for air purification and passive healthcare.
随着对环保型空气过滤材料需求的不断增加，聚乳酸（PLA）纳米纤维膜（NFMs）在高效空气净化同时避免塑料污染方面显示出巨大潜力。然而，PLA固有的低电活性和较差的驻极体性能问题仍亟待解决。在此，我们在纤维状纤维素上制备了MOF功能化的核壳珠状PLA（MCSB-PLA）梯度纳米纤维，通过同轴静电纺丝形成了具有PLA/MOF-5复合壳层的结构。在高压电场作用下，MOF-5纳米晶体易于与PLA链相互作用，促使生成高度细化且具有电活性的纳米纤维。MCSB-PLA纳米纤维膜的特征在于超细纤维（直径减小23.5%）和MOF引发的串珠状微观结构。同时，MCSB-PLA纳米纤维膜的表面电位和介电常数均大幅提高（分别高达5.2 kV和1.86），并伴有优异的摩擦输出性能（输出电压和电流分别增加236.8%和161.9%）。鉴于电活性的提高，MCSB-PLA纳米纤维膜显示出高效的PM过滤性能（在32 L/min时为93.4%，106 Pa），与纯PLA对应物（仅83.2%）相比提高了12.26%。即使在高湿度条件下，MCSB-PLA也能实现91.3%的PM去除率（在90%RH和32 L/min时）。此外，自供电机制与MCSB-PLA/纤维素相结合，可实现生理信号的实时监测。所提出的可降解且具有高电活性的MCSB-PLA纳米纤维膜在空气净化和被动医疗保健方面极具前景。
