Experimental study on jet impact speed in near-field electrospinning for precise patterning of nanofiber

Shin, Dongwoon; Kim, Jong-Hyun; Chang, Jiyoung

doi:10.1016/j.jmapro.2018.10.011

Cited by 26 publications

(21 citation statements)

References 37 publications

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“…Hence, NFES is mostly triggered by inducing an artificial instability, providing a very high local electric field to break the surface tension. [ 8–10,14 ] However, NFES can also be enabled by reducing the applied voltage together with TTCD after breaking the surface tension by applying the critical voltage. In this study, NFES is realized by the latter method in order to compare and understand the difference in the jetting mechanism.…”

Section: Resultsmentioning

confidence: 99%

“…Owing to the spherical symmetry of the droplet, a similar electric field strength at applied voltage of 500 V is found throughout JTD regardless of a jetting angle (θ) from 0° to 90°, as presented in Figure 3b. The short gap between the droplet and the substrate curtails the acceleration distance for the jet, [ 10 ] effectively reducing the effect of the inertia due to the slow jet speed (Figure S2, Supporting Information). Furthermore, it is found that a strong electric field strength above 1.0 × 10 6 V m −1 is maintained through JTD (Figure 3b), which is another significant factor that the electric force dominates the kinematics of the charged nanoscale jet.…”

Section: Resultsmentioning

confidence: 99%

“…[ 9 ] Beyond simple lines of nanofiber, precise printing of a continuous nanofiber was realized for complex patterns in microscale, by matching the jet impact speed and the collector speed. [ 10 ] Direct‐printing ability of NFES has led the utilization of functional nanofiber to various applications including electronics, [ 11 ] scaffolds for tissue engineering, [ 12 ] optoelectronics, [ 13 ] fiber membrane for a fluidic channel, [ 14 ] sensors, [ 15 ] and energy harvesting. [ 16 ] As described, NFES has achieved remarkable advancement as one of the direct‐printing methods since its first demonstration in 2006.…”

Section: Introductionmentioning

confidence: 99%

“…Such progress of NFES has been based on 2D planar surfaces, thereby fabrication of nanofiber patterns/structures has been limited to 2D surfaces. [ 7,8,10,16 ] However, the fabrication of functional nanofiber on 3D surfaces is essential not only to obtain compatibility with 3D living organisms and conformal electronics [ 17 ] but also to provide new functionalities that only arise on multidimensional surfaces. [ 18,19 ]…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Direct‐Printing of Functional Nanofibers on 3D Surfaces Using Self‐Aligning Nanojet in Near‐Field Electrospinning

Shin

Choi

Kim

et al. 2020

Adv Materials Technologies

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This paper reports a high‐resolution, template‐free, and direct‐printing method of functional nanofiber on 3D surfaces using a self‐aligning nanojet (SA‐N) in near‐field electrospinning (NFES). In the lowest regime of NFES, the cone‐jet transition is induced by the surface current, which leads to a unique jetting configuration where the microscale Taylor cone (microcone) is formed on the surface of the spherical‐shape droplet. The microcone rapidly develops to the nanoscale jet where the tangential electric force dominates the kinematics of the charged jet. The spherical‐shape ejection boundary allows the jetting angle from 0° to ±90° in both convex and concave surfaces, enabling precise deposition of nanofiber regardless of the curvature of the 3D surfaces. Using SA‐N, precise printing of functional nanofiber is successfully demonstrated on various 3D geometries, including convex, concave, and inner surface of the 3D structure. The direct‐printing ability of nanofiber on 3D surfaces using SA‐N will be a promising strategy to utilize various functional polymers in flexible electronics, printed electronics, optics, and biomedical engineering.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Direct‐Printing of Functional Nanofibers on 3D Surfaces Using Self‐Aligning Nanojet in Near‐Field Electrospinning

Shin

Choi

Kim

et al. 2020

Adv Materials Technologies

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“…2) with the current NFES setup when PAN is used. The formation of these coiled wires is attributed to the higher velocity of the wires relative to the collector 54 , which results in a higher probability of deviation from a straight path 55 . As depicted in Fig.…”

Section: Scaling Analysismentioning

confidence: 99%

Fabrication of patterned graphitized carbon wires using low voltage near-field electrospinning, pyrolysis, electrodeposition, and chemical vapor deposition

et al. 2020

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We herein report a high-resolution nanopatterning method using low voltage electromechanical spinning with a rotating collector to obtain aligned graphitized micro and nanowires for carbon nanomanufacturing. A small wire diameter and a small inter-wire spacing were obtained by controlling the electric field, the spinneret-to-collector distance, the pyrolysis parameters, the linear speed of the spinneret, the rotational speed of the collector. Using a simple scaling analysis, we show how the straightness and the diameter of the wires can be controlled by the electric field and the distance of the spinneret to the collector. A small inter-wire spacing, as predicted by a simple model, was achieved by simultaneously controlling the linear speed of the spinneret and the rotational speed of the collector. Rapid drying of the polymer nanowires enabled the facile fabrication of suspended wires over various structures. Patterned polyacrylonitrile wires were carbonized using standard stabilization and pyrolysis to obtain carbon nanowires. Suspended carbon nanowires with a diameter of <50 nm were obtained. We also established a method for making patterned, highly graphitized structures by using the aforementioned carbon wire structures as a template for chemical vapor deposition of graphite. This patterning technique offers high throughput for nano writing, which outperforms other existing nanopatterning techniques, making it a potential candidate for large-scale carbon nanomanufacturing.

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Fiber Scaffold Patterning for Mending Hearts: 3D Organization Bringing the Next Step

Kristen

Ainsworth

Chirico

et al. 2019

Adv Healthcare Materials

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Heart failure (HF) is a leading cause of death worldwide. The most common conditions that lead to HF are coronary artery disease, myocardial infarction, valve disorders, high blood pressure, and cardiomyopathy. Due to the limited regenerative capacity of the heart, the only curative therapy currently available is heart transplantation. Therefore, there is a great need for the development of novel regenerative strategies to repair the injured myocardium, replace damaged valves, and treat occluded coronary arteries. Recent advances in manufacturing technologies have resulted in the precise fabrication of 3D fiber scaffolds with high architectural control that can support and guide new tissue growth, opening exciting new avenues for repair of the human heart. This review discusses the recent advancements in the novel research field of fiber patterning manufacturing technologies for cardiac tissue engineering (cTE) and to what extent these technologies could meet the requirements of the highly organized and structured cardiac tissues. Additionally, future directions of these novel fiber patterning technologies, designs, and applicability to advance cTE are presented.

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Experimental study on jet impact speed in near-field electrospinning for precise patterning of nanofiber

Cited by 26 publications

References 37 publications

Direct‐Printing of Functional Nanofibers on 3D Surfaces Using Self‐Aligning Nanojet in Near‐Field Electrospinning

Direct‐Printing of Functional Nanofibers on 3D Surfaces Using Self‐Aligning Nanojet in Near‐Field Electrospinning

Fabrication of patterned graphitized carbon wires using low voltage near-field electrospinning, pyrolysis, electrodeposition, and chemical vapor deposition

Fiber Scaffold Patterning for Mending Hearts: 3D Organization Bringing the Next Step

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