Journal
APPLIED SCIENCES-BASEL
Volume 8, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/app8020164
Keywords
electrohydrodynamic jetting; drop-on-demand; jetting frequency; damping ratio; natural frequency
Categories
Funding
- Korea Evaluation Institute of Industrial Technology - Ministry of Trade, Industry and Energy of the Korean Government [10052802]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10052802] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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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