EHD (electrohydrodynamics) printing has recently attracted attention for micro/nano size pattern devices due to it can make very small droplet than nozzle diameter and possibility of the use of various ink such as including metal, organic and bio material and high viscosity ink. EHD printing exist various ejection mechanisms, depending on the applied voltage and pressure, liquid property, nozzle materials and geometry. Specially, a study on the applied voltage and frequency is important for reliable high-speed printing in drop-on-demand EHD printing. In this paper, we study the phenomenon of meniscus deformation and ejection by various pulse voltages and frequencies in drop-on-demand EHD printing. To study the phenomenon of meniscus deformation, we measured the height of meniscus by the time of each pulse sequence. As in low frequency, after oscillation or ejection by pulse voltage, meniscus height at bias voltage before the next pulse voltage is restored. But, as in high frequency, after oscillation or ejection by pulse voltage, meniscus height is not restored. Because, that is the next pulse voltage apply before restoring the height of the meniscus. In particular, required for reliable high-speed printing in EHD printing, the printing of high-frequency, has confirmed the importance of restoration of meniscus.
Journal: TechConnect Briefs
Volume: 2, Nanotechnology 2010: Electronics, Devices, Fabrication, MEMS, Fluidics and Computational
Published: June 21, 2010
Pages: 500 - 503
Industry sector: Sensors, MEMS, Electronics
Topic: Micro & Bio Fluidics, Lab-on-Chip