Needleless Electrospinning from a Tube with an Embedded Wire Loop

Jahan, Israt; Wang, Lijing; Wang, Xin

doi:10.1002/mame.201800588

Cited by 20 publications

(14 citation statements)

References 28 publications

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“…It is common knowledge that electrospinning is a simple and convenient method to prepare nanofibers. Nevertheless, some problems need to be addressed for further practical applications, such as improving the productivity of nanofibers and enhancing the quality of nanofibers [9]. The productivity of nanofibers with the conventional single-needle method is very low.…”

Section: Introductionmentioning

confidence: 99%

Multiple-Jet Needleless Electrospinning Approach via a Linear Flume Spinneret

et al. 2019

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There is a great limitation to improving the quality and productivity of nanofibers through the conventional single-needle method. Using needleless electrospinning technology to generate multiple jets and enhance the productivity of nanofibers has attracted lots of interest for many years. This study develops a novel linear flume spinneret to fabricate nanofibers. Multiple jets with two rows can be formed simultaneously on the surface of the spinneret. The solution concentration has a significant impact on the average nanofiber diameter compared with applied voltage and collection distance. The effects of different spinning process parameters on the productivity of nanofibers are investigated. High-quality nanofibers with small nanofiber diameter and error can be fabricated successfully. The average nanofiber diameter is 108 ± 26 nm. The average error is 24%. The productivity of nanofibers can reach 4.85 ± 0.36 g/h, which is about 24 times more than that of the single-needle method. This novel linear flume spinneret needleless electrospinning technology exhibits huge potential for mass production of nanofibers in the field of industrialization.

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Section: Introductionmentioning

confidence: 99%

Multiple-Jet Needleless Electrospinning Approach via a Linear Flume Spinneret

et al. 2019

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“…A metal plucked string spinneret was used to generate multiple jet with comparatively low electric voltage (25 kV) with a narrow diameter distribution range . A tube with an embedded wire loop also was used to generate needleless electrospinning with multiple jet …”

Section: Introductionmentioning

confidence: 99%

“…21 A tube with an embedded wire loop also was used to generate needleless electrospinning with multiple jet. 22 Controlling of the loading of solution to the free surface in needleless electrospinning has been the issue that affects the generation of multiple jet and the quality of the as-spun nanofibers. Ideally, a thin layer of polymer solution on the free surface with the most concentrated electric field is the best solution in generating multiple jet continuously.…”

Section: Introductionmentioning

confidence: 99%

Electrospinning from a convex needle with multiple jet toward better controlling and enhanced production rate

Jahan

Jadhav

Wang

et al. 2019

J of Applied Polymer Sci

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Multiple jet was successfully generated from a convex needle spinneret based on a conventional electrospinning setup. A convex channel was created in the front part of the needle to generate a limited free surface in the electrospinning process. A high flow rate was implemented with more than one polymer jet being produced, resulting in the production rate 2–3 times higher than conventional electrospinning. Finer nanofibers were produced from the convex needle when the applied voltage was 19 kV. The electric field intensity distribution of this spinneret was analyzed and compared with conventional needle spinneret by Comsol Multiphysics modeling. The research work has demonstrated that scaling up the production rate of nanofibers from needle‐based free surface electrospinning is possible. It will benefit further development of electrospinning with enhanced throughput and more precise controlling. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48014.

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“…Besides the huge free surface of the solution, the high voltages required (e.g., cylinder 57 kV, disc 42 kV, coil 45 kV, and needle roller 35 kV) to initiate polymer jets is another disadvantage of most existing needleless technologies, as the evaporating volatile solvent is a safety hazard . To reduce the threshold voltage, some research teams proposed other needleless spinnerets, including a needle roller (a roller with sharp needle pieces) with a threshold voltage of 35 kV, a plucked string with a minimum applied voltage of 15 kV, and a wire loop with a voltage of 12 kV, embedded in a tube . More recently, Yan et al demonstrated slot electrospinning aided by an aerodynamic field and an auxiliary electric field with a lower voltage (10–30 kV).…”

Section: Introductionmentioning

confidence: 99%

“…[32] To reduce the threshold voltage, some research teams proposed other needleless spinnerets, including a needle roller (a roller with sharp needle pieces) with a threshold voltage of 35 kV, [31] a plucked string with a minimum applied voltage of 15 kV, [32] and a wire loop with a voltage of 12 kV, embedded in a tube. [33] More recently, Yan et al [34] demonstrated slot electrospinning aided by an aerodynamic field and an auxiliary electric field with a lower voltage (10-30 kV).…”

Section: Introductionmentioning

confidence: 99%

In Situ Viscosity‐Controlled Electrospinning with a Low Threshold Voltage

Kara

Molnár

2019

Macro Materials & Eng

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In the present study, a novel electrospinning method is proposed,where jet formation is aided by shearing the solution in situ. With a generalpolymer solution, viscosity decreases by shearing, that is, the solution isshear‐thinning. Poly(ethylene‐oxide) is used as a model polymer andthe effects of rotation speed, solution concentration, and gap size (the widthof the annular orifice) on the process and the morphology of the obtainedfibers are investigated. It is found that the threshold voltage for generatingmultiple jets decreased from 35 to 12 kV when rotation speed is higher than60 rpm (or shear rate more than 310 s−1). Additionally, the results show thatfiber diameter increases as the concentration of the solution increases. Thechi‐square two‐sample test is used to compare the distribution of fibersproduced by the capillary method and the novel electrospinning process. Inthe authors' method, the viscosity of the solution can be changed by applyingmechanical forces on it during the electrospinning process, which results inthe initiation of the electrospinning jet at a low threshold voltage. It is alsofound that gap size has a similar effect on fiber diameter as needle diameter in classical electrospinning.

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Needleless Electrospinning from a Tube with an Embedded Wire Loop

Cited by 20 publications

References 28 publications

Multiple-Jet Needleless Electrospinning Approach via a Linear Flume Spinneret

Multiple-Jet Needleless Electrospinning Approach via a Linear Flume Spinneret

Electrospinning from a convex needle with multiple jet toward better controlling and enhanced production rate

In Situ Viscosity‐Controlled Electrospinning with a Low Threshold Voltage

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