Self-charging and long-term face masks leveraging low-cost,biodegradable and sustainable piezoelectric nanofiber membrane  

作　　者：Zhenqi Wang Zhuomin Zhang Zehua Peng Xiaodan Yang Xuemu Li Yao Shan Bingren Liu Xiaote Xu Yongsheng Gao Zhengbao Yang 

机构地区：[1]Department of Mechanical and Aerospace Engineering,Hong Kong University of Science and Technology,Clear Water Bay,Hong Kong China [2]Department of Mechanical Engineering,City University of Hong Kong,Hong Kong China

出　　处：《Nano Materials Science》2025年第1期113-122,共10页纳米材料科学(英文版)

基　　金：supported by General Research Grants (GRF Project No. 11212021 and No. 11210822) from the Research Grants Council of the Hong Kong Special Administrative Region;the Innovation and Technology Fund (Project No. ITS/065/20;GHP/096/19SZ) from Innovation and Technology Commission of Hong Kong Special Administrative Region

摘　　要：The mass discarding face masks has caused severe environmental problems during and after the COVID-19 pandemic.To reduce waste and minimize environmental impact,we present a new face mask featuring selfcharging extended service time and fully biodegradable materials.To extend the effective service time,we need to supplement the lost electric charge of the electret layer of face masks,for which task we propose to use the piezoelectric effect and generate electricity from breathing motions.However,existing piezoelectric materials are either toxic,impermeable,rigid,costly,or non-degradable.We synthesize a fully biodegradable piezoelectric membrane composed of polyvinyl alcohol(PVA)and glycine(GLY)via the electrospinning process.Parameters are accurately controlled to ensure that glycine crystallizes into a highly piezoelectricβphase during electrospinning and enables piezoelectric responses of the filter membrane.Tested with the standard 0.3μm particles,face masks made of the PVA-GLY membrane show an outstanding filtration efficiency of 97%,which remains stable over at least 10 h of high-concentration continuous filtration.Furthermore,we demonstrated the biodegradability of PVA-GLY masks,which can degrade completely within a few weeks,compared to commonly used surgical masks requiring over thirty years to be decomposed.

关 键 词：PIEZOELECTRIC Amino acid MICROFIBER FILTRATION COVID ELECTROSPINNING Environment Health 

分 类 号：TS941.7[轻工技术与工程—服装设计与工程] TB3[一般工业技术—材料科学与工程]