Rheology behaviors of stable electrohydrodynamic direct-write jet

Wang, Xiang; Zheng, Gaofeng; Xu, Lei; Wang, Han; Li, Wenwang

doi:10.1063/1.4964620

Cited by 7 publications

(6 citation statements)

References 26 publications

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“…This imaging device should be able to observe comprehensive details in a cost-effective way so as to observe the jet triggering voltage and the lowest voltage for stable EHDP process. Researchers have studied Taylor cone modes with different viscous solutions[ 8 ]. When high viscous solutions are fed into the EHDP system, the jet ejection velocity can be comparable with that of the computer-controlled precision stage in the range of 50–400 mm/s[ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Electrohydrodynamic printing process monitoring by microscopic image identification

Sun¹,

Jing²,

Fan³

et al. 2018

IJB

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Electrohydrodynamic printing (EHDP) is able to precisely manipulate the position, size, and morphology of micro-/nano-fibers and fabricate high-resolution scaffolds using viscous biopolymer solutions. However, less attention has been paid to the influence of EHDP jet characteristics and key process parameters on deposited fiber patterns. To ensure the printing quality, it is very necessary to establish the relationship between the cone shapes and the stability of scaffold fabrication process. In this work, we used a digital microscopic imaging technique to monitor EHDP cones during printing, with subsequent image processing algorithms to extract related features, and a recognition algorithm to determine the suitability of Taylor cones for EHDP scaffold fabrication. Based on the experimental data, it has been concluded that the images of EHDP cone modes and the extracted features (centroid, jet diameter) are affected by their process parameters such as nozzle-substrate distance, the applied voltage, and stage moving speed. A convolutional neural network is then developed to classify these EHDP cone modes with the consideration of training time consumption and testing accuracy. A control algorithm will be developed to regulate the process parameters at the next stage for effective scaffold fabrication.

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Section: Introductionmentioning

confidence: 99%

Electrohydrodynamic printing process monitoring by microscopic image identification

Sun¹,

Jing²,

Fan³

et al. 2018

IJB

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“…However, when viscosity is changed ( ), as increases, the operating range of dimensionless flow rate ( ) increases for , and the operating range of dimensionless voltage ( ) increases for . Although the results showed that increasing viscoelasticity of the ink is beneficial to the formation of a stable cone jet, whereas an excessively high viscoelasticity would increase the jet diameter thus decreasing the resolution of patterns 105 .…”

Section: For Electrohydrodynamic Jet Printingmentioning

confidence: 88%

An overview on the principle of inkjet printing technique and its application in micro-display for augmented/virtual realities

Yang¹,

Lin²,

Wu³

et al. 2022

OEA

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Augmented reality (AR) and virtual reality (VR) are two novel display technologies that are under updates. The essential feature of AR/VR is the full-color display that requires high pixel densities. To generate three-color pixels, the fluorescent color conversion layer inevitably includes green and red pixels. To fabricate such sort of display kits, inkjet printing is a promising way to position the color conversion layers. In this review article, the progress of AR/VR technologies is first reviewed, and in succession, the state of the art of inkjet printing, as well as two key issues -the optimization of ink and the reduction of coffee-ring effects, are introduced. Finally, some potential problems associated with the color converting layer are highlighted.

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“…24,25 The charge repulsion force F q enhances the instable motion of the charged jet and decreases the diameter of the nanofiber. 26,27 …”

Section: -6mentioning

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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Rheology behaviors of stable electrohydrodynamic direct-write jet

Cited by 7 publications

References 26 publications

Electrohydrodynamic printing process monitoring by microscopic image identification

Electrohydrodynamic printing process monitoring by microscopic image identification

An overview on the principle of inkjet printing technique and its application in micro-display for augmented/virtual realities

Electrospinning jet behaviors under the constraints of a sheath gas

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