Electrospinning writing with molten poly (ε-caprolactone) from different directions – Examining the effects of gravity

Wunner, Felix M.; Maartens, Joachim; Bas, Onur; Gottschalk, Konstantin; Hutmacher, Dietmar W.

doi:10.1016/j.matlet.2017.12.079

Cited by 20 publications

(12 citation statements)

References 12 publications

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“…More recently, with the advent of melt electrospinning and melt electrospinning writing (MEW), Wunner et al [ 50 ] notably researched the effect of gravity on MEW of PCL conducted in all three setup orientations. In contrast to the results reported by Yang et al, the average fibre diameter was seen to reduce from top-down to horizontal to bottom-up orientation in their account.…”

Section: State Of the Art—impact Of Apparatus Orientation In Electmentioning

confidence: 99%

“…In the multiparametric study mentioned in Section 2.2 , Wunner et al [ 50 ] concluded that at low flow rates, melt electrospinning can be conducted without variability at any orientation. However, at high flow rates, gravity affects the Taylor cone more in horizontal and bottom-up electrospinning than in top-down spinning, resulting in a pulsating Taylor cone and subsequent distortion of the intended scaffold architecture [ 50 , 66 ] in these cases. By keeping the flow rate small, and therefore the effect of gravity, the same group was able to upscale the melt electrospinning process.…”

Section: State Of the Art—impact Of Apparatus Orientation In Electmentioning

confidence: 99%

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Impact of Apparatus Orientation and Gravity in Electrospinning—A Review of Empirical Evidence

2020

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Electrospinning is a versatile fibre fabrication method with applications from textile to tissue engineering. Despite the appearance that the influencing parameters of electrospinning are fully understood, the effect of setup orientation has not been thoroughly investigated. With current burgeoning interest in modified and specialised electrospinning apparatus, it is timely to review the impact of this seldom-considered parameter. Apparatus configuration plays a major role in the morphology of the final product. The primary difference between spinning setups is the degree to which the electrical force and gravitational force contribute. Since gravity is much lower in magnitude when compared with the electrostatic force, it is thought to have no significant effect on the spinning process. But the shape of the Taylor cone, jet trajectory, fibre diameter, fibre diameter distribution, and overall spinning efficiency are all influenced by it. In this review paper, we discuss all these developments and more. Furthermore, because many research groups build their own electrospinning apparatus, it would be prudent to consider this aspect as particular orientations are more suitable for certain applications.

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Section: State Of the Art—impact Of Apparatus Orientation In Electmentioning

confidence: 99%

Section: State Of the Art—impact Of Apparatus Orientation In Electmentioning

confidence: 99%

Impact of Apparatus Orientation and Gravity in Electrospinning—A Review of Empirical Evidence

2020

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“…Some polymer resins are difficult to dissolve in any solvents at room temperature and are only melt-spun. Thus, melt e-spinning is an effective way to fabricate ultrafine fibers, such as polypropylene (PP), polylactic acid, poly(ε-caprolactone), and the like [13,14,15,16]. Compared with solution e-spinning, melt e-spinning is more efficient and benign, and as-spun fibers are easier to control, which is beneficial before their application in electrostatic direct writing or three-dimensional (3D) printing [17,18,19].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Ultrafine PPS Fibers with High Strength and Tenacity via Melt Electrospinning

Fan

et al. 2019

Polymers

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Electrospinning (e-spinning) is an emerging technique to prepare ultrafine fibers. Polyphenylene sulfide (PPS) is a high-performance resin which does not dissolve in any solvent at room temperature. Commercial PPS fibers are produced mainly by meltblown or spunbonded process to give fibers ~20 μm in diameter. In this research, an in-house designed melt electrospinning device was used to fabricate ultrafine PPS fibers, and the e-spinning operation conducted under inert gas to keep PPS fibers from oxidizing. Under the optimum e-spinning conditions (3 mm of nozzle diameter, 30 kV of electrostatic voltage, and 9.5 cm of tip-to-collector distance), the as-spun fibers were less than 8.0 μm in diameter. After characterization, the resultant PPS fibers showed uniform diameter and structural stability. Compared with commercial PPS staple fibers, the obtained fibers had a cold crystallization peak and 10 times higher storage modulus, thereby offering better tensile tenacity and more than 400% elongation at break.

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“…The forces used to drive the jet in this process are electrostatic, the same as solution electrospinning, but in melt electrospinning, the polymer is drawn in the melted state, rather than in solution phase ( Figure ). This solvent‐free method typically produces fibers mostly with diameters of tens of microns or more, which is considerably thicker than solution electrospinning with typically sub‐micron fibers . The larger diameter of fibers obtained with melt spinning is caused by several factors.…”

Section: Introductionmentioning

confidence: 99%

Wire Melt Electrospinning of Thin Polymeric Fibers via Strong Electrostatic Field Gradients

Morikawa

Vashisth

Grimme

et al. 2018

Macro Materials & Eng

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Here, a novel melt electrospinning method to produce few‐micron and nanometer thick fibers is presented, in which a polymer‐coated wire with a sharp tip is used as the polymer source. The polymer coating is melted via Joule heating of the source wire and extracted toward the target via electrostatic forces. The high viscosity and low charge density of polymer melts lower their stretchability in melt. The method relies on confining the Taylor cone and reducing initial jet diameter via concentrated electrostatic fields as a means to reduce the diameter of fibers. As a result, the initial jet diameter and the final fiber diameter are reduced by an order of magnitude of three to ten times, respectively, using wire melt electrospinning compared to syringe‐ and edge‐based electrospinning. The fiber diameter melt electrospun via this novel method is 1.0 ± 0.9 µm, considerably thinner than conventional melt electrospinning techniques. The generation of thin fibers are explained in terms of the electrostatic field around the wire tip, as obtained from finite element analysis (FEA), which controls the size and shape of the melt electrospun jet.

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Electrospinning writing with molten poly (ε-caprolactone) from different directions – Examining the effects of gravity

Cited by 20 publications

References 12 publications

Impact of Apparatus Orientation and Gravity in Electrospinning—A Review of Empirical Evidence

Impact of Apparatus Orientation and Gravity in Electrospinning—A Review of Empirical Evidence

Fabrication of Ultrafine PPS Fibers with High Strength and Tenacity via Melt Electrospinning

Wire Melt Electrospinning of Thin Polymeric Fibers via Strong Electrostatic Field Gradients

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