School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China.
School of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, China.
ACS Appl Mater Interfaces. 2023 Aug 9;15(31):37580-37592. doi: 10.1021/acsami.3c08490. Epub 2023 Jul 25.
The concept of triboelectric nanogenerator (TENG)-based fibrous air filters, in which the electroactive fibers are ready to enhance the electrostatic adsorption by sustainable energy harvesting, is appealing for long-term respiratory protection and in vivo real-time monitoring. This effort discloses a self-reinforcing electroactivity strategy to confer extreme alignment and refinement of the electrospun poly(lactic acid) (PLA) nanofibers, significantly facilitating formation of electroactive phases (i.e., β-phase and highly aligned chains and dipoles) and promotion of polarization and electret properties. It endowed the PLA nanofibrous membranes (NFMs) with largely increased surface potential and filtration performance, as exemplified by efficient removal of PM and PM (90.68 and 99.82%, respectively) even at the highest airflow capacity of 85 L/min. With high electroactivity and a well-controlled morphology, the PLA NFMs exhibited superior TENG properties triggered by regular respiratory vibrations, enabling 9.21-fold increase of surface potential (-1.43 kV) and nearly 68% increase of PM capturing (94.3%) compared to those of conventional PLA membranes. The remarkable TENG mechanisms were examined to elaborately monitor the personal respiration characteristics, particularly those triggered large and rapid variations of output voltages like coughing and tachypnea. Featuring desirable biocompatibility and degradability, the self-powered PLA NFMs permit promising applications in the fabrication of ecofriendly air filters toward high-performance purification and intelligent monitoring.
基于摩擦纳米发电机（TENG）的纤维空气过滤器的概念，其中的电活性纤维可以通过可持续的能量收集来增强静电吸附，这对于长期的呼吸保护和体内实时监测具有吸引力。这项工作揭示了一种自增强的电活性策略，赋予了电纺聚乳酸（PLA）纳米纤维极高的取向度和细化度，显著促进了电活性相（即β相和高度取向的链段和偶极子）的形成和极化、驻极体性能的提升。这使得 PLA 纳米纤维膜（NFMs）具有大大提高的表面电势和过滤性能，例如，即使在最高气流容量为 85 L/min 的情况下，对 PM 和 PM（分别为 90.68%和 99.82%）的去除效率也很高。由于具有高电活性和良好控制的形态，PLA NFMs 表现出由常规呼吸振动触发的优异 TENG 性能，表面电势（-1.43 kV）增加了 9.21 倍，PM 捕获率（94.3%）增加了近 68%，与传统 PLA 膜相比。详细检查了显著的 TENG 机制，以精心监测个人呼吸特征，特别是那些引发输出电压大幅快速变化的特征，如咳嗽和呼吸急促。具有良好的生物相容性和可降解性，自供电 PLA NFMs 有望应用于制造环保空气过滤器，以实现高性能净化和智能监测。
