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

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.

DNA Alignment-Induced Linear Dichroism via Magnetic Field Assisted Electrospray: Implications for Optical Applications

“…The electrospray of ssDNA suspension was devised as shown in Figure . It was tested on an EHD system, which was previously announced and detailed in Figure S4 . It consisted of a fluid reservoir, power supply, translation stage, and 3D printed MEMS nozzle head.…”

“…It was tested on an EHD system, which was previously announced and detailed in Figure S4. 30 It consisted of a fluid reservoir, power supply, translation stage, and 3D printed MEMS nozzle head. 3D printed MEMS nozzle head was successfully fabricated and installed in EMHD system which withstood high voltages with fluid sealing.…”

Special Issue on Printed Electronics 2017

“…They also validated their new method by comparing it with a conventional method and found the new method produced more uniform patterns even at much higher printing speed. In the viewpoint of meniscus deformation and oscillation of EHD printing, Kim et al investigated the influence of damping ratio on the stability of EHD jetting performance [4]. Damping ratios were controlled by adopting different nozzle geometries, and a simplified linear damping model was used to describe the oscillating motion of Ag ink inside the nozzle.…”

Numerical Modeling of the Motion and Interaction of a Droplet of an Inkjet Printing Process with a Flat Surface

“…Electrohydrodynamic drop-on-demand printing of aqueous suspensions of drug nanoparticles were introduced by Elele et al [20]. The effect of meniscus damping ratio on drop-ondemand electrohydrodynamic jetting was analyzed by Kim et al [21].…”