Investigating the draw ratio and velocity of an electrically charged liquid jet during electrospinning

Ding, Chenhui; Fang, Hong; Duan, Gaigai; Zou, Yan; Chen, Shouhui; Hou, Haoqing

doi:10.1039/c9ra02024a

Cited by 26 publications

(15 citation statements)

References 55 publications

(70 reference statements)

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“…where d is the mat thickness, A is the cross-sectional area through which the current passes (0.5 cm 2 ), and R is the measured resistance. The velocity of the jet was calculated using the model reported by Ding et al [63]. This model is based on the mass conversation of the polymer in the fiber.…”

Section: Methodsmentioning

confidence: 99%

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Electrospun Anion-Conducting Ionomer Fibers—Effect of Humidity on Final Properties

et al. 2020

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Anion-conducting ionomer-based nanofibers mats are prepared by electrospinning (ES) technique. Depending on the relative humidity (RH) during the ES process (RHES), ionomer nanofibers with different morphologies are obtained. The effect of relative humidity on the ionomer nanofibers morphology, ionic conductivity, and water uptake (WU) is studied. A branching effect in the ES fibers found to occur mostly at RHES < 30% is discussed. The anion conductivity and WU of the ionomer electrospun mats prepared at the lowest RHES are found to be higher than in those prepared at higher RHES. This effect can be ascribed to the large diameter of the ionomer fibers, which have a higher WU. Understanding the effect of RH during the ES process on ionomer-based fibers’ properties is critical for the preparation of electrospun fiber mats for specific applications, such as electrochemical devices.

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Section: Methodsmentioning

confidence: 99%

“…The velocity of the jet was calculated using the model reported by Ding et al [ 63 ]. This model is based on the mass conversation of the polymer in the fiber.…”

Section: Methodsmentioning

confidence: 99%

Electrospun Anion-Conducting Ionomer Fibers—Effect of Humidity on Final Properties

et al. 2020

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“…The charge distribution and charge flow direction during electrospinning with positive or negative voltage are illustrated in Figure 1 b,c. When the electrospun solution is a poorly conducting leaky dielectric fluid, net charge accumulates at the cone and jet surfaces [ 28 , 36 , 37 ]. The charge is of the same polarity as the applied voltage of the spinneret.…”

Section: Introductionmentioning

confidence: 99%

The Role of Electrical Polarity in Electrospinning and on the Mechanical and Structural Properties of As-Spun Fibers

et al. 2020

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Electric field strength and polarity in electrospinning processes and their effect on process dynamics and the physical properties of as-spun fibers is studied. Using a solution of the neutral polymer such as poly(methyl methacrylate) (PMMA) we explored the electrospun jet motion issued from a Taylor cone. We focused on the straight jet section up to the incipient stage of the bending instability and on the radius of the disk of the fibers deposited on the collecting electrode. A new correlation formula using dimensionless parameters was found, characterizing the effect of the electric field on the length of the straight jet, L˜E~E˜0.55. This correlation was found to be valid when the spinneret was either negatively or positively charged and the electrode grounded. The fiber deposition radius was found to be independent of the electric field strength and polarity. When the spinneret was negatively charged, L˜E was longer, the as-spun fibers were wider. The positively charged setup resulted in fibers with enhanced mechanical properties and higher crystallinity. This work demonstrates that often-overlooked electrical polarity and field strength parameters influence the dynamics of fiber electrospinning, which is crucial for designing polymer fiber properties and optimizing their collection.

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“…Just as the traditional electrospinning, one of the most important challenges for the modified coaxial electrospinning is to create nanofibers on a large scale [71][72][73]. Another important challenge is get more and more knowledge about the special working processes [74], here the key point is about the unspinnable sheath fluid's role during the transmission of solvents through air-fluid-fluid interfaces and the related solidification mechanism of electrospun nanostructures. Certainly, the structure-performance relationships for environmental and also other applications based on the nanoproducts prepared using modified coaxial electrospinning should be a very interesting topic deservin.…”

Section: Discussionmentioning

confidence: 99%

Electrospun Environment Remediation Nanofibers Using Unspinnable Liquids as the Sheath Fluids: A Review

Wang

Yang

et al. 2020

Polymers

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Electrospinning, as a promising platform in multidisciplinary engineering over the past two decades, has overcome major challenges and has achieved remarkable breakthroughs in a wide variety of fields such as energy, environmental, and pharmaceutics. However, as a facile and cost-effective approach, its capability of creating nanofibers is still strongly limited by the numbers of treatable fluids. Most recently, more and more efforts have been spent on the treatments of liquids without electrospinnability using multifluid working processes. These unspinnable liquids, although have no electrospinnability themselves, can be converted into nanofibers when they are electrospun with an electrospinnable fluid. Among all sorts of multifluid electrospinning methods, coaxial electrospinning is the most fundamental one. In this review, the principle of modified coaxial electrospinning, in which unspinnable liquids are explored as the sheath working fluids, is introduced. Meanwhile, several typical examples are summarized, in which electrospun nanofibers aimed for the environment remediation were prepared using the modified coaxial electrospinning. Based on the exploration of unspinnable liquids, the present review opens a way for generating complex functional nanostructures from other kinds of multifluid electrospinning methods.

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Investigating the draw ratio and velocity of an electrically charged liquid jet during electrospinning

Abstract: Theoretical calculations and experiments were performed to determine the draw ratio and velocity of an electrospinning jet.

Cited by 26 publications

References 55 publications

Electrospun Anion-Conducting Ionomer Fibers—Effect of Humidity on Final Properties

Electrospun Anion-Conducting Ionomer Fibers—Effect of Humidity on Final Properties

The Role of Electrical Polarity in Electrospinning and on the Mechanical and Structural Properties of As-Spun Fibers

Electrospun Environment Remediation Nanofibers Using Unspinnable Liquids as the Sheath Fluids: A Review

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