Improvement of Uniformity of Needleless Electrospun Nanofibers

2013 ◽  
Vol 821-822 ◽  
pp. 200-203
Author(s):  
Wan Jun Liu ◽  
Chen Huang ◽  
Xiang Yu Jin
Keyword(s):  
Polyvinyl Alcohol ◽  
Applied Voltage ◽  
Water Solution ◽  
Electrospun Nanofibers ◽  
Diameter Distribution ◽  
Needleless Electrospinning ◽  
Uniform Diameter

Polyvinyl alcohol (PVA) water solution was electrospun using both needle electrospinning and needleless electrospinning methods. Finer and uniform nanofibers were obtained from disc and coil electrospinng, when compared to those of conventional needle electrospinning. The finest nanofibers were 217±86 nm and 234±82 nm in diameter from disc and coil electrospinning respectively, while fibers from needle electrospinning was 296±36 nm when the applied voltage was 12kV. However, needle electrospinning produced nanofibers with a more uniform diameter distribution.

Study on Needle and Needleless Electrospinning for Nanofibers

2013 ◽  
Vol 750-752 ◽  
pp. 276-279 ◽  
Author(s):  
Wan Jun Liu ◽  
Hai Feng Zhang ◽  
Da Wei Li ◽  
Chen Huang ◽  
Xiang Yu Jin
Keyword(s):  
Stainless Steel ◽  
Polyvinyl Alcohol ◽  
Applied Voltage ◽  
Large Scale ◽  
Fiber Diameter ◽  
Water Solution ◽  
Electrospun Nanofibers ◽  
Diameter Distribution ◽  
Spiral Coil ◽  
Needleless Electrospinning

Polyvinyl alcohol (PVA) water solution was electrospun by both needle electrospinning and needleless electrospinning. The electrodes for needless electrospinning were rotary spiral disk and spiral coil made from stainless steel. We found that needleless electrospinning can obtain nanofibers in large-scale, while fiber diameter and diameter distribution were larger when compared to the conventional needle electrospinning. The average diameters of disk electrospun and coil electrospun nanofibers were 441±99nm and 415±103nm respectively. As for needle electrospun nanofibers, the diameters were 393±29nm and 349±25nm when the applied voltage were 10kV and 15kV respectively.

Electrospun Poly(Styrene-co-maleic anhydride) Nanofibers for β-D-Galactosidase Immobilization and Enzymatic Transgalactosylation

2011 ◽  
Vol 396-398 ◽  
pp. 1394-1397
Author(s):  
Peng Ju Li ◽  
Yu Fei Zhang ◽  
Song Ping Zhang ◽  
Ping Wang ◽  
Min Wang
Keyword(s):  
Maleic Anhydride ◽  
Flow Rate ◽  
Applied Voltage ◽  
Nonionic Surfactants ◽  
Immobilized Enzyme ◽  
Electrospun Nanofibers ◽  
Significant Enhancement ◽  
Enzyme Loading ◽  
Original Activity ◽  
Uniform Diameter

Poly(styrene-co-maleic anhydride) nanofibers with a uniform diameter of about 400 nm were prepared by eletrospinning a solution containing 50 % (w/v) polymer and 1% (w/v) LiCl, 25 cm gap between jection needle tip and collector, a flow rate of 200 L/h, and an applied voltage of 24 kV. β-D-galactosidase was immobilized to the electrospun nanofibers and subsequently used for synthesizing hexyl-galactoside, an important nonionic surfactants, by catalyzing the transgalactosylation reaction between hexanol and lactose. Co-electrospun LiCl was found leading to a significant enhancement in the enzyme loading and activity of the immobilized β-D-galactosidase compared to nanofiber without LiCl. After 7 reusing cycles at 37oC, the immobilized enzyme retained about 33% of its original activity.

Effect of Solution Conductivity on the Morphology of Bubble-Electrospun Nanofibers

2011 ◽  
Vol 332-334 ◽  
pp. 1003-1006 ◽  
Author(s):  
Rui Rui Yang ◽  
Ji Huan He ◽  
Jian Yong Yu
Keyword(s):  
Mass Fraction ◽  
Smooth Surface ◽  
Electrospun Nanofibers ◽  
Diameter Distribution ◽  
Electrical Conductivities ◽  
Mean Diameter ◽  
Solution Conductivity

In this paper, we have bubble-electrospun PLA nanofibers to analyze and investigate the effect of different electrical conductivities by adding different amounts of LiCl into the PLA/DMF solutions on the morphology and diameter of the nanofibers. As a result, it is found that when the mass fraction of LiCl is 0.5%, we can obtain the smallest mean diameter of bubble-electrospun nanofibers with more smooth surface and uniform fineness. Moreover, both improving and reducing LiCl concentration brings on coarse nanofibers surface and poor diameter distribution.

Preparation of fully hydrolyzed polyvinyl alcohol electrospun nanofibers with diameters of sub-200 nm by viscosity control

2012 ◽  
Vol 82 (16) ◽  
pp. 1635-1644 ◽  
Author(s):  
Fan Liu ◽  
Tomohiro Nishikawa ◽  
Wataru Shimizu ◽  
Takaaki Sato ◽  
Hisanao Usami ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Electrospun Nanofibers

Effect of Introducing Long Chain Branching on Fiber Diameter and Fiber Diameter Distribution in Melt Blowing Process of Polypropylene

2021 ◽  
Vol 36 (4) ◽  
pp. 403-409
Author(s):  
K. Iiba ◽  
W. Takarada ◽  
T. Kikutani
Keyword(s):  
Fiber Diameter ◽  
Viscosity Reduction ◽  
Diameter Distribution ◽  
Polymer Rheology ◽  
Melt Blowing ◽  
Melt Flow Rate ◽  
Long Chain Branching ◽  
Molten Polymers ◽  
Uniform Diameter ◽  
Long Chain

Abstract In the melt blowing process, the molten polymers extruded from nozzles are elongated by high-velocity and high-temperature air flow. In this study, with the aim of stabilizing the melt blowing process for producing nonwoven webs with fine diameter fibers, the effect of the control of polymer rheology by the introduction of either low melt flow rate (MFR) polypropylene (PP) or long chain branched PP (LCB-PP) to regular high MFR PP was investigated. Introduction of low MFR PP into regular PP increased shear viscosity and fibers of larger diameter were produced in the melt blowing process, while introduction of low MFR LCB-PP suppressed the elongational viscosity reduction with the increase of strain rate, and eventually spinning was stabilized. It was found that the blending of an optimum amount of LCB-PP to regular PP caused the stabilization of the melt blowing process. As a result, the formation of nonwoven webs consisting of fine fibers of rather uniform diameter distribution could be achieved.

scholarly journals Evaluation of the Antimicrobial Effect of Chitosan/Polyvinyl Alcohol Electrospun Nanofibers Containing Mafenide Acetate

2015 ◽  
Vol 8 (10) ◽  
Author(s):  
Mohammadreza Abbaspour ◽  
Behzad Sharif Makhmalzadeh ◽  
Behjat Rezaee ◽  
Saeed Shoja ◽  
Zohreh Ahangari
Keyword(s):  
Polyvinyl Alcohol ◽  
Electrospun Nanofibers ◽  
Antimicrobial Effect

Using PVA/CA/Au NPs electrospun nanofibers as a green nanosorbent to preconcentrate and determine Pb2+ and Cu2+ in rice samples, water sources and cosmetics

2020 ◽  
Vol 44 (35) ◽  
pp. 15000-15009
Author(s):  
Zahra Mehrani ◽  
Zahra Karimpour ◽  
Homeira Ebrahimzadeh
Keyword(s):  
Citric Acid ◽  
Polyvinyl Alcohol ◽  
Electrospun Nanofibers ◽  
Water Sources ◽  
Au Nps ◽  
Rice Samples

Polyvinyl alcohol (PVA)/citric acid (CA)/Au NPs electrospun nanofibers was synthesized and applied as a green and efficient sorbent to extract and preconcentrate Pb2+ and Cu2+ from water sources, rice samples and cosmetics before FAAS.

Research on Electrospinning Process of Pullulan Nanofibers

2012 ◽  
Vol 268-270 ◽  
pp. 198-201 ◽  
Author(s):  
Xiao Bin Sun ◽  
D. Jia ◽  
Wei Min Kang ◽  
Bo Wen Cheng ◽  
Ya Bin Li
Keyword(s):  
Flow Rate ◽  
Applied Voltage ◽  
Great Influence ◽  
Solution Concentration ◽  
Electrospinning Process ◽  
Diameter Distribution ◽  
Optimal Parameters ◽  
Redistilled Water ◽  
Water As Solvent

A kind of pullulan biopolymer nanofibers with diameter of 100～700nm were obtained using redistilled water as solvent through electrospinning technology in this paper. The effects of the spinning solution concentration, applied voltage, flow rate and capillary–screen distance on morphology and diameter distribution of pullulan nanofiber were studied by SEM. The results show that, different parameters had great influence on nanofibers’ morphology and diameter. The optimal parameters of pullulan nanofibers electrospinning were: 22wt.% spinning solution concentration, 31 kV voltage, 20 cm capillary–screen distance and 0.5ml/h flow rate.

scholarly journals Fiber Generators in Needleless Electrospinning

2012 ◽  
Vol 2012 ◽  
pp. 1-13 ◽  
Author(s):  
Haitao Niu ◽  
Tong Lin
Keyword(s):  
Production Rate ◽  
Scale Up ◽  
Electrospun Nanofibers ◽  
Scaling Up ◽  
Electrospinning Process ◽  
Recent Advances ◽  
Needleless Electrospinning ◽  
Application Potential

The conventional electrospinning often uses a needle-like nozzle to produce nanofibers with a very low production rate. Despite the enormous application potential, needle electrospun nanofibers meet difficulties in broad applications in practice, due to the lack of an economic and efficient way to scale up the electrospinning process. Recently, needleless electrospinning has emerged as a new electrospinning mode and shown ability to produce nanofibers on large-scales. It has been established that the fiber generator, also referred to as “spinneret” in this paper, in needleless electrospinning plays a key role in scaling up the nanofiber production. This paper summarizes the recent advances in the development of needleless spinnerets and their influences on electrospinning process, nanofiber quality, and productivity.

Sign in / Sign up

Export Citation Format

Share Document