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

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 electr...

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Bibliographic Details
Published in:Applied sciences 2018-01, Vol.8 (2), p.164
Main Authors: Kim, Samuel, Kang, Heuiseok, Kang, Kyungtae, Lee, Sang, Cho, Kwan, Hwang, Jun
Format: Article
Language:English
Subjects:
Bioengineering
Damping ratio
drop-on-demand
Ejection
Electric fields
electrohydrodynamic jetting
Electrohydrodynamics
Fabrication
Jet printing
jetting frequency
Linear damping
Nanoparticles
natural frequency
Nozzle geometry
Nozzles
Patterning
Viscosity
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Summary: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.
ISSN:2076-3417
2076-3417
DOI:10.3390/app8020164