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Appl. Sci. 2018, 8(2), 164; https://doi.org/10.3390/app8020164

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

1
Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
2
Korea Institute of Industrial Technology, Cheonan 31056, Korea
*
Author to whom correspondence should be addressed.
Received: 15 December 2017 / Revised: 17 January 2018 / Accepted: 23 January 2018 / Published: 24 January 2018
(This article belongs to the Special Issue Printed Electronics 2017)
View Full-Text   |   Download PDF [1468 KB, uploaded 24 January 2018]   |  

Abstract

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. View Full-Text
Keywords: electrohydrodynamic jetting; drop-on-demand; jetting frequency; damping ratio; natural frequency electrohydrodynamic jetting; drop-on-demand; jetting frequency; damping ratio; natural frequency
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Kim, S.H.; Kang, H.; Kang, K.; Lee, S.H.; Cho, K.H.; Hwang, J.Y. Effect of Meniscus Damping Ratio on Drop-on-Demand Electrohydrodynamic Jetting. Appl. Sci. 2018, 8, 164.

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