While electrospinning is an effective method for fabricating nanofibers with good application prospects,controlling the length of stable section of electrospinning jet is critical and remains challenging.In the paper,...While electrospinning is an effective method for fabricating nanofibers with good application prospects,controlling the length of stable section of electrospinning jet is critical and remains challenging.In the paper,the effects of electrospinning parameters on the length of stable section have been investigated experimentally using polyacrylonitrile(PAN).The results based on single factor experiments and orthogonal experiments showed that the stable⁃jet length increased with the increase of solution concentration,receiving distance,voltage and solution flow rate,and decreased with the enhanced concentration of salt which was commonly utilized as additive to facilitate the spinning.Furthermore,experimental results based on polyethylene oxide(PEO)and polyvinyl alcohol(PVA)showed that the length of stable section changed with increasing salt concentration,and due to the parametric interaction,the change was distinct under different driving voltages or solution concentration conditions.展开更多
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 capabil...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.展开更多
基金National Natural Science Foundation of China(Nos.51773037,51973027,51803023,and 61771123)Fundamental Research Funds for the Central Universities(Nos.2232020D⁃15,2232020A⁃08,2232020G⁃01,2232020D⁃14,and 2232018A3⁃11)+3 种基金Changjiang Youth Scholars Program of ChinaInnovation Program of Shanghai Municipal Education Commission,ChinaShanghai Sailing Program,China(No.18YF 1400400)China Postdoctoral Science Foundation(No.2018M640317)。
文摘While electrospinning is an effective method for fabricating nanofibers with good application prospects,controlling the length of stable section of electrospinning jet is critical and remains challenging.In the paper,the effects of electrospinning parameters on the length of stable section have been investigated experimentally using polyacrylonitrile(PAN).The results based on single factor experiments and orthogonal experiments showed that the stable⁃jet length increased with the increase of solution concentration,receiving distance,voltage and solution flow rate,and decreased with the enhanced concentration of salt which was commonly utilized as additive to facilitate the spinning.Furthermore,experimental results based on polyethylene oxide(PEO)and polyvinyl alcohol(PVA)showed that the length of stable section changed with increasing salt concentration,and due to the parametric interaction,the change was distinct under different driving voltages or solution concentration conditions.
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)+6 种基金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 Hongthe 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 CASTthe DHU Distinguished Young Professor Program to Prof.WANG Li Mingthe Fundamental Research Funds for the Central Universitiesthe Graduate Student Innovation Fund of Donghua University(Grant No.CUSF-DH-D-2020015)to Ms.LEI Sai Ling。
文摘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.
