On-demand electrohydrodynamic jetting with meniscus control by a piezoelectric actuator for ultra-fine patterns

Young Jae Kim, Sang Yoon Kim, Jun Sung Lee, Jungho Hwang, Yong Jun Kim

Research output: Contribution to journalArticle

18 Citations (Scopus)


The on-demand ejection of ultra-fine droplets that uses both an electrohydrodynamic (EHD) force and mechanical actuation is presented. The liquid meniscus was controlled by a piezoelectric actuator, and the droplets were ejected by the EHD force. Through these effects, it was possible to obtain a high operational jetting frequency of 1 kHz with a short delay time (about 50 νs) in comparison with existing on-demand, EHD jetting methods, such as the pulsating jet mode (3-10 ms) and the pulsed cone-jet mode (3.6 ms). Simultaneously, we obtained ultra-fine droplets through adjustments of the piezoelectric driving waveform. The jetting characteristics were examined for both the hydrophobicity and the hydrophilicity of the surface of a capillary.

Original languageEnglish
Article number107001
JournalJournal of Micromechanics and Microengineering
Issue number10
Publication statusPublished - 2009 Nov 9


All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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