Electrohydrodynamic direct-writing microfiber patterns under stretching

Zheng, Guo; Sun, Lingling; Wang, Xiang; Wei, Jin; Xu, Lei; Liu, Yifang; Zheng, Jianyi; Liu, Juan

doi:10.1007/s00339-015-9584-3

Cited by 33 publications

(18 citation statements)

References 20 publications

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“…According to the flow field simulation, the velocity of sheath gas at the outlet of nozzles is in the range of 10‐100 m·s −1 , which is larger than the initial velocity of electrospinning jet of about 0.05‐0.5 m·s −1 . The relative motion velocity between sheath gas and charged jet v r is defined as:

v_{r} = v_{gas} - v_{jet} > 0

Where, v gas is the velocity of sheath gas, and v jet is the motion velocity of charged jet.…”

Section: Resultsmentioning

confidence: 99%

Multinozzle high efficiency electrospinning with the constraint of sheath gas

Zheng

Jiang

Chen

et al. 2019

J of Applied Polymer Sci

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In this article, sheath gas is introduced to design a novel multinozzle spinneret to improve the productivity of uniform nanofibers. The sheath gas in laminar flow provides an additional stretching force to overcome the mutual interferences among the nozzles, thus the simultaneous ejection of multiple jets is promoted. In addition, the sheath gas also contributes to the decrease of the diameter and the diameter distribution range of nanofibers. With the constraint of sheath gas, the productivity of nanofibers is 0.618‐0.712 g·h−1, which is about 30‐50 times as high as that from traditional electrospinning. The dynamic properties of the gas–liquid surface are investigated as well. A bead‐on‐strain model based on Maxwell theory is built up to study the motion and rheology behaviors of multiple jets, and the simulation results verify the experimental results well. The proposed method will accelerate the industrial applications of uniform electrospun nanofibrous membrane. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47574.

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v_{r} = v_{gas} - v_{jet} > 0

Where, v gas is the velocity of sheath gas, and v jet is the motion velocity of charged jet.…”

Section: Resultsmentioning

confidence: 99%

Multinozzle high efficiency electrospinning with the constraint of sheath gas

Zheng

Jiang

Chen

et al. 2019

J of Applied Polymer Sci

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“…Electrohydrodynamic jetting or printing recently attracts extensive attentions in fabricating highresolution features based on the principle of elec tro hydro dy namically induced material flows [12][13][14][15][16][17][18] . Several process parameters had been investigated to achieve stable electrohydrodynamic printing process, such as applied voltage, moving speed, feeding rate of materials and inter diameter of nozzle [19][20][21][22][23][24][25][26] . Recent explorations indicate that biomaterials like living cells and hydrogels can be electrohydrodynamically printed and maintained their viability [27][28][29][30] .…”

Section: Introductionmentioning

confidence: 99%

Coaxial nozzle-assisted electrohydrodynamic printing for microscale 3D cell-laden constructs

Liang¹,

He²,

Chang³

et al. 2024

IJB

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Cell printing has found wide applications in biomedical fields due to its unique capability in fabricating living tissue constructs with precise control over cell arrangements. However, it is still challenging to print cell-laden 3D structures simultaneously with high resolution and high cell viability. Here a coaxial nozzle-assisted electrohydrodynamic cell printing strategy was developed to fabricate living 3D cell-laden constructs. Critical process parameters such as feeding rate and stage moving speed were evaluated to achieve smaller hydrogel filaments. The effect of CaCl 2 feeding rate on the printing of 3D alginate hydrogel constructs was also investigated. The results indicated that the presented strategy can print 3D hydrogel structures with relatively uniform filament dimension (about 80 μm) and cell distribution. The viability of the encapsulated cells was over 90%. We envision that the coaxial nozzle-assisted electrohydrodynamic printing will become a promising cell printing strategy to advance biomedical innovations. Keywords: electrohydrodynamic printing; cell printing; bioprinting; biofabrication; tissue engineering

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“…The initial velocity of the electrospinning jet is approximately 0.05∼0.5 m/s. 20,21 The velocity of the sheath gas is larger than that of the charged jet, which provides an additional stretching force and constraint effect on the jet. The relative velocity between the sheath gas and charged jet is the primary reason for the additional stretching force.…”

Section: A Flow Simulation Of Sheath Gasmentioning

confidence: 99%

Electrospinning jet behaviors under the constraints of a sheath gas

Zhao

Jiang

et al. 2016

AIP Advances

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Increasing the ejection efficiency and uniformity of nanofibers is the key to applications of electrospinning technology. In this work, a novel electrospinning spinneret with a sheath gas passageway is designed. The frictional resistance that stems from the sheath gas provides additional stretching and restriction forces on the jet. The sheath gas also reduces interference and enhances the stability of the charged jet. A bead-on-strain simulation model is built up to determine the constraint effects of the sheath gas. Simulation results show that the sheath gas decreases the motion area and increases the stretching ratio of the liquid jet. The stretching force from the sheath gas decreases the diameter and increases the uniformity of the nanofiber. As the gas pressure increases from 0 kPa to 50 kPa, the critical voltage of the jet ejection decreases from 8.4 kV to 2.5 kV, the diameter of the nanofiber deposition zone decreases from 40 cm to 10 cm, and the diameter of the nanofibers decreases from 557.97 nm to 277.73 nm. The uniformity of nanofibers can be improved significantly using a sheath gas. The sheath gas contributes to the rapid deposition of a uniform nanofibrous membrane and the industrial applications of electrospinning.

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Electrohydrodynamic direct-writing microfiber patterns under stretching

Cited by 33 publications

References 20 publications

Multinozzle high efficiency electrospinning with the constraint of sheath gas

Multinozzle high efficiency electrospinning with the constraint of sheath gas

Coaxial nozzle-assisted electrohydrodynamic printing for microscale 3D cell-laden constructs

Electrospinning jet behaviors under the constraints of a sheath gas

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