Ultrafine, self-crimp, and electret nano-wool for low-resistance and high-efficiency protective filter media against PM0.3

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:578

Article

Li, Yuyao¹  Cao, Leitao¹  Yin, Xia^1,2  Si, Yang^1,2  Yu, Jianyong²  Ding, Bin² 

[1] Donghua Univ, Coll Text, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 201620, Peoples R China

[2] Donghua Univ, Innovat Ctr Text Sci & Technol, Shanghai 200051, Peoples R China

关键词: Self-crimp;    High porosity;    Electret effect;    Nano-wool;    Air filtration;   

DOI  :  10.1016/j.jcis.2020.05.123

来源: Elsevier

【 摘 要 】

Frequent outbreaks of emerging infectious diseases (EIDs) make personal protective filter media in high demand. Electrospun nanofibrous materials are proved to be very effective in resisting virus-containing fine particles owing to their small fiber diameters; however, hindered by the intrinsic close-packing character of fine fibers, electrospun filters suffer from a relatively high air resistance, thereby poor breathing comfort. Here, we report a biomimetic and one-step strategy to create ultrafine and curly wool-like nano-fibers, named nano-wool, which exhibit fluffy assembly architecture and powerful electret effect. By achieving the online self-crimp and in-situ charging of nanofibers, the curly electret nano-wool shows a small diameter of similar to 0.6 mu m (two orders of magnitude lower than natural wool: similar to 20 mu m) and an ultrahigh porosity of 98.7% simultaneously, together with an ultrahigh surface potential of 13260 V (one order of magnitude higher than previous filters). The structural advantages and powerful electret effect enable nano-wool to show excellent filtration efficacy (>99.995% for PM0.3) and low air resistance (55 Pa). Additionally, nano-wool can be easily scaled up, not only holding great industrial prospect in personal protective respirators, but also paving the way for developing next-generation wool in a cost-efficient and multifunctional form. (C) 2020 Elsevier Inc. All rights reserved.

【 授权许可】

Free