Wang Lingyun, Bian Ye, Lim Chee Kent, Niu Zhuolun, Lee Patrick K H, Chen Chun, Zhang Li, Daoud Walid A, Zi Yunlong
Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China.
School of Energy and Environment, City University of Hong Kong, Hong Kong, Kowloon, China.
Nano Energy. 2021 Jul;85:106015. doi: 10.1016/j.nanoen.2021.106015. Epub 2021 Mar 24.
Face masks have been an effective and indispensable personal protective measure against particulate matter pollutants and respiratory diseases, especially the novel Coronavirus disease recently. However, disposable surgical face masks suffer from low filtration efficiency for particles ranging from nano- to micro-size, and the limited service life of ~ 4 h. Here, a nano/micro fibrous hybrid air filter mask composing of electrospun nanofibrous network and poly(3,4-ethylenedioxythiophene:poly(styrenesulfonate) coated polypropylene (PP) is proposed. Furthermore, the resultant filter is supplied with tribo-charges by a freestanding sliding triboelectric nanogenerator. Through the enhanced synergistic effect of mechanical interception and electrostatic forces, the hybrid air filter demonstrates high filtration efficiency for particle size of 11.5 nm to 2.5 µm, with a 9.3-34.68% enhancement for particles of 0.3-2.5 µm compared to pristine PP, and 48-h stable filtration efficiency of 94% (0.3-0.4 µm) and 99% (1-2.5 µm) with a low pressure drop of ~110 Pa. In addition, sterilization ability of the tribo-charge enhanced air filter is demonstrated. This work provides a facile and cost-effective approach for state-of-the-art face masks toward high filtration performance of nano- to micro- particles with greatly extended service life.
口罩一直是抵御颗粒物污染物和呼吸道疾病的一种有效且不可或缺的个人防护措施，尤其是近期对于新型冠状病毒病。然而，一次性外科口罩对于纳米至微米尺寸范围内的颗粒过滤效率较低，且使用寿命有限，约为4小时。在此，我们提出一种由静电纺纳米纤维网络和聚（3,4 - 亚乙基二氧噻吩：聚苯乙烯磺酸盐）涂覆的聚丙烯（PP）组成的纳米/微纤维混合空气过滤口罩。此外，所得过滤器由独立的滑动摩擦电纳米发电机提供摩擦电荷。通过增强机械拦截和静电力的协同效应，这种混合空气过滤器对于粒径为11.5纳米至2.5微米的颗粒具有高过滤效率，与原始PP相比，对于0.3 - 2.5微米的颗粒过滤效率提高了9.3 - 34.68%，并且在约110帕的低压降下，48小时内对于0.3 - 0.4微米颗粒的过滤效率稳定在94%，对于1 - 2.5微米颗粒的过滤效率稳定在99%。此外，还展示了摩擦电荷增强型空气过滤器的杀菌能力。这项工作为实现具有高过滤性能、能大幅延长使用寿命的纳米至微米颗粒的先进口罩提供了一种简便且经济高效的方法。
