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

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

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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 In Stock 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 Trivets 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.