Investigation of Parameters Affecting PAN Nanofiber Production Using Electrical and Centrifugal Forces as a Novel Method

Dabirian, Farzad; Ravandi, Seyed Abdolkarim Hosseini; Pishevar, Ahmadreza

doi:10.2174/157341310797575078

Cited by 34 publications

(36 citation statements)

References 30 publications

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“…As shown in Figure , the changes observed in the jet ejection speed against the changes made in the rotational speed at a fixed voltage had an exponential trend. The results were in agreement with what had been previously reported by Dabirian et al…”

Section: Resultssupporting

confidence: 94%

Determining the effect of centrifugal and electrical forces on the jet behaviors, the nanofiber structure, and morphology

Hosseinian

Valipouri

Ravandi

et al. 2018

Polymers for Advanced Techs

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The increasing demand for nanofibers production has led to the rapid growth of the usage of electro‐centrifugal spinning (ECS) systems especially in recent years. Besides the rapid developments, fabrication of novel fibrous materials with novel techniques is still under investigation. Polyvinylepyrrolidone (PVP) is one of the multifunctional materials, which has attracted scientific interests to be employed in a variety of advanced applications. The main objective of the present study was therefore to explore the effects of essential parameters involved in fabrication of PVP nanofibers via an ECS system. The effects of rotational speed (197‐4051 r/min) and applied voltage (0‐14 kV) on the structural and morphological properties of nanofibers were also investigated. Analyses of the scanning electron microscope (SEM) images were performed with Digimizer and SPSS16.0 software to characterize the diameter distribution of the nanofibers. The degree of crystallinity was evaluated by the X‐ray diffraction method. In order to explain the unexpected results, further investigations were performed on the motion of the jet and flow rate. The results showed that instead of nanofibers, microparticles were formed at lower voltages and rotational speeds. The increase in the applied voltage resulted in a decrease in the minimum rotational speed that is required to form continuous fluid jet. The bending instabilities were changed from whipping to spiraling at the voltages above 10 kV. This resulted in the minimum fiber diameter at a voltage between 6 and 10 kV. Moreover, the applied voltage slightly affected the degree of crystallinity. No significant change was observed in the degree of crystallinity by varying the rotational speed.

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Section: Resultssupporting

confidence: 94%

Determining the effect of centrifugal and electrical forces on the jet behaviors, the nanofiber structure, and morphology

Hosseinian

Valipouri

Ravandi

et al. 2018

Polymers for Advanced Techs

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“…The electro-centrifugal spinning setup was first introduced by Dabirian et al 24 to pro-duce nanofibers by means of electric and centrifugal forces. Electro-centrifugal spinning suffered from a stream of air surrounding the nozzle.…”

Section: A Simulation and Comparison With Experimentsmentioning

confidence: 99%

“…18 Wallwork et al, 19 Decent et al, 20 Wong et al, 21 and Pȃrȃu et al 22 experimentally and numerically investigated the prilling process for the production of fertilizers, considering a air-sealed centrifuge spinning, 1 and air-sealed electrocentrifugal spinning 12 all have proven successful as viable rotational jet. Dabirian et al [23][24][25] have experimentally investigated methods to mass-produce polymeric nanofibers, allowing a significant increase in yield and simplifying the production. In a) Author to whom correspondence should be addressed:apishe@cc.iut.ac.ir electro-centrifugal spinning.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental study on the steady cone-jet mode of electro-centrifugal spinning

et al. 2018

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This study focuses on a numerical investigation of an initial stable jet through the air-sealed electrocentrifugal spinning process, which is known as a viable method for the mass production of nanofibers. A liquid jet undergoing electric and centrifugal forces, as well as other forces, first travels in a stable trajectory and then goes through an unstable curled path to the collector. In numerical modeling, hydrodynamic equations have been solved using the perturbation method-and the boundary integral method has been implemented to efficiently solve the electric potential equation. Hydrodynamic equations have been coupled with the electric field using stress boundary conditions at the fluid-fluid interface. Perturbation equations were discretized by a second order finite difference method, and the Newton method was implemented to solve the discretized non-linear system. Also, the boundary element method was utilized to solve electrostatic equations. In the theoretical study, the fluid was described as a leaky dielectric with charges only on the surface of the jet traveling in dielectric air. The effect of the electric field induced around the nozzle tip on the jet instability and trajectory deviation was also experimentally studied through plate-plate geometry as well as point-plate geometry. It was numerically found that the centrifugal force prevails on electric force by increasing the rotational speed. Therefore, the alteration of the applied voltage does not significantly affect the jet thinning profile or the jet trajectory. Published by AIP Publishing. https://doi

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“…The nonwoven fiber mat separators are typically thick (i.e., 100-200 lm); however, in effort to reduce this thickness, recent fiber manufacturing technology such electrospinning, centrifugal spinning, and ForceSpinning V R have emerged that can produce fiber of thickness of 10220 lm with diameters that are typically less than 5 lm. 11,[46][47][48][49][50] These fiber processing methods have been successful in giving the nonwoven separators its high labyrinth-like pores structure. 48 Presently the most commonly used methods for making these nanofibers employ either an electrostatic charge (electrospinning) 51 or external heated air jets (melt-blowing), 40,52-56 bicomponent fiber spinning, phase separation, template synthesis, and self-assembly.…”

Section: Introductionmentioning

confidence: 99%

“…15 However, the centrifugal spinning method, has several drawbacks such as; it cannot be used to produce fibers of uniform cross-section, it has no capacity of melt spinning, thus it incapable of producing fibers from very viscous solutions and a very low fiber yield. 50,[57][58][59] The ForceSpinning Technique, on the other hand, has several features such as a fiber management system that allow tunable fiber deposition to ensure accurate cross directional coating uniformity, and also adaptable to substrate web widths. The Fiber-Lab L1000 system in particular, has the capability for dual materials feed thus allowing the continuous materials feed system especially for melt and solution processing with no material dielectric properties requirements.…”

Section: Introductionmentioning

confidence: 99%

ForceSpinning of polyacrylonitrile for mass production of lithium‐ion battery separators

Agubra¹,

Garza²,

Gallegos³

et al. 2015

J of Applied Polymer Sci

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We present results on the Forcespinning V R (FS) of Polyacrylonitrile (PAN) for mass production of polymer nanofiber membranes as separators for Lithium-ion batteries (LIBs). Our results presented here show that uniform, highly fibrous mats from PAN produced using Forcespinning V R , exhibit improved electrochemical properties such as electrolyte uptake, low interfacial resistance, high oxidation limit, high ionic conductivity, and good cycling performance when used in lithium ion batteries compared to commercial PP separator materials. This article introduces ForceSpinning V R , a cost effective technique capable of mass producing high quality fibrous mats, which is completely different technology than the commonly used in-house centrifugal method. This Forcespinning V R technology is thus the beginning of the nano/micro fiber revolution in large scale production for battery separator application. This is the first time to report results on the cycle performance of LIB-based polymer nanofiber separators made by Forcespinning V R technology. V C 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 42847.

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Investigation of Parameters Affecting PAN Nanofiber Production Using Electrical and Centrifugal Forces as a Novel Method

Cited by 34 publications

References 30 publications

Determining the effect of centrifugal and electrical forces on the jet behaviors, the nanofiber structure, and morphology

Determining the effect of centrifugal and electrical forces on the jet behaviors, the nanofiber structure, and morphology

Numerical and experimental study on the steady cone-jet mode of electro-centrifugal spinning

ForceSpinning of polyacrylonitrile for mass production of lithium‐ion battery separators

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