Time resolved imaging of electrohydrodynamic jetting on demand induced by square pulse voltage

Lee, Seungmi; Song, Junyoung; Kim, Ho; Chung, Jihoon

doi:10.1016/j.jaerosci.2012.05.006

Cited by 19 publications

(19 citation statements)

References 23 publications

(14 reference statements)

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“…Bias voltage is applied to the nozzle by a high voltage DC power supply (ConverTech, Gyeonggi, Korea, SHV 300R). To minimize the droplet size and facilitate generation of drops with low pulse voltage, bias voltage was applied at 90% of onset voltage, Von, at which point EHD-jet starts to form, as shown in Figure 1b [4,5]. The following equation estimates the value of Von [16,17] ~ ln 8ℎ 4 − 8…”

Section: Methodsmentioning

confidence: 99%

“…Meniscus deformation was investigated by changing the imposed voltage such that when the bias voltage increases, not only the meniscus height increases, but also the chance of jetting of smaller drops with lower pulse voltage also increases [3][4][5]. By changing the applied voltage and flow rate, jet type was also studied such that, as the flow rate and voltage increase, the jet-mode changes from dripping, to pulsating, to cone-jet, to tilted-jet, and to multi-jet [6,7].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Meniscus Damping Ratio on Drop-on-Demand Electrohydrodynamic Jetting

Kim

Kang

et al. 2018

Applied Sciences

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Drop-on-demand (DOD) electrohydrodynamic (EHD) jet printing uses a nozzle and pulsated electric fields to eject small ink droplets of functional material to the appointed spot of a substrate at the appointed time, which offers solutions of high resolution patterning for fabrication of printed electronics, bioengineering, and display. Because the EHD jet connects fine drops to yield a fine pattern, it is essential to realize high throughput by generating drops quickly and reliably. In this study, the characteristics of jetting frequency were experimentally investigated as a function of nozzle dimensions by measuring response of jetting frequency to pulsating frequency which is varying from 1 Hz to 2000 Hz. The results showed that, even when the nozzle diameter is the same, the other dimensions of the nozzle significantly change the response of jetting to high pulsating frequency. Using a linear damping model describing hydrodynamic motion of ink inside the nozzle, the different behavior of the jetting frequency was explained via the different damping ratio of the oscillating ink: contrary to an underdamped system, an overdamped system supports a jetting frequency higher than the natural frequency.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Meniscus Damping Ratio on Drop-on-Demand Electrohydrodynamic Jetting

Kim

Kang

et al. 2018

Applied Sciences

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“…Also, the values of liquid flow rates for electrodripping are usually much larger than those used in electrosprays, which leads to the generation of much larger droplets. Other modes of electrodripping are actually under investigation [36,[39][40][41].…”

Section: Other Electric Regimesmentioning

confidence: 99%

Fluid Flows for Engineering Complex Materials

Loscertales¹

2016

Fluids, Colloids and Soft Materials: An Introduction to Soft Matter Physics

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“…Recently, in order to demonstrate drop-on-demand printing in the cone-jet mode, many researchers have adapted a square voltage pulse superposed by a dc bias voltage [9][10][11][12][13]. The short high-voltage pulse releases a droplet (or a finite number of droplets) from the nozzle, while the lower bias needs to ensure that a near conical shaped meniscus is always present, but not discharging any fluid [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…The short high-voltage pulse releases a droplet (or a finite number of droplets) from the nozzle, while the lower bias needs to ensure that a near conical shaped meniscus is always present, but not discharging any fluid [12,13]. Therefore, the jetting start time can be shortened and the jetting frequency can be maximized [14,15].…”

Section: Introductionmentioning

confidence: 99%