Microtech2010 2010

The Investigation of Electrostatic Induced Inkjet Printing System for the Ejection of a Stable Micro/Nano Droplet

J. Choi, Y-J Kim, S.U. Son, K. Chul An, S. Lee
Sungkyunkwan University, KR

Keywords: electrostatic induced inkjet printing system, micro-dripping mode, droplet, surface tension, electrical conductivity


Inkjet printing technology has recently attracted considerable attention for a simple fabrication and advanced pattering process during the past decade. In order to manufacture advanced inkjet printing technology, my team has alternatively proposed and investigated a completely different inkjet printing technology. It has called electrostatic induced inkjet printing technology which is based on electro-hydro-dynamics (EHD) theory. The electrostatic induced inkjet printing system has approximately 10 jetting modes. A micro-dripping mode, one of them, has only one short droplet of micro/nano size, very fast jetting frequency and no spray phenomenon until get to a substrate after passing through gate electrode. Therefore, we focused that electrostatic induced inkjet printing system makes droplets by micro-dripping mode. To be ejecting in micro-dripping mode, we focused on the changing shape of meniscus on the nozzle. A meniscus changing shape on nozzle edge is decided by ink characteristic. Thus, ink properties are measured in various inks as the wt% solution of NaCl and SDS (sodium dodecyl sulfate). As an experiment result, electrostatic induced inkjet printing system has the optimal ranges of surface tension and electrical conductivity to be stable ejecting in micro-dripping mode.
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