Controllable diameter of electrospun nanofibers based on the velocity of whipping jets for high-efficiency air filtration  

作　　者：LEI SaiLing WANG LiMing WANG RongWu QIN XiaoHong YU JianYong 

机构地区：[1]Key Laboratory of Textile Science&Technology,Ministry of Education,College of Textiles,Donghua University,Shanghai 201620,China [2]Innovation Center for Textile Science and Technology,Donghua University,Shanghai 201620,China

出　　处：《Science China(Technological Sciences)》2022年第2期481-489,共9页中国科学（技术科学英文版）

基　　金：partly supported by the Fundamental Research Funds for the Central Universities(Grant Nos.2232020D-15,2232020A-08,2232020G-01,2232020D-14,2232019D3-11);the National Natural Science Foundation of China(Grant Nos.51773037,51973027,51803023,52003044,61771123);supported by the Chang Jiang Scholars Program and the Innovation Program of Shanghai Municipal Education Commission(Grant No.2019-01-07-00-03-E00023)to Prof.QIN Xiao Hong;the Shanghai Sailing Program(Grant No.19YF1400700);the Opening Project of State Key Laboratory of High Performance Ceramics and Superfine Microstructure(Grant No.SKL201906SIC);the Young Elite Scientists Sponsorship Program by CAST;the DHU Distinguished Young Professor Program to Prof.WANG Li Ming;the Fundamental Research Funds for the Central Universities;the Graduate Student Innovation Fund of Donghua University(Grant No.CUSF-DH-D-2020015)to Ms.LEI Sai Ling。

摘　　要：Electrospun nanofibers are regarded as a promising candidate for filtration because of their prominent size effect.The precise control of nanofiber diameter is the key to the material’s outstanding filtration capability,but it remains a challenge.Herein,an electrohydrodynamic scaling model is established for the accurate prediction of fiber diameter based on the velocity of the whipping jet.In this model,the velocity reflects jet stretching and is tuned by adding salt.The theoretical predictions agree well with the experimental results.With the proposed diameter model,the filtration property of the membrane is significantly optimized by governing the fiber diameter.When the nanofiber is slenderized to 183 nm,an ultralight (0.521 g m;) membrane exhibits high filtration efficiency (99.93%) and low pressure drop (105.2 Pa) against ultrafine aerosol particles (≤0.26μm) under an airflow face velocity of 5.33 cm s^(-1).These findings demonstrate that the established surface charge-based diameter model provides an excellent platform to timely and accurately control the nanofiber diameter via the velocity of whipping jets for highefficiency air filtration.

关 键 词：ELECTROSPINNING jet velocity fiber diameter FILTRATION 

分 类 号：TQ342[化学工程—化纤工业]