期刊
JOURNAL OF AEROSOL SCIENCE
卷 46, 期 -, 页码 1-6出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jaerosci.2011.11.002
关键词
Electrohydrodynamic (END); Drop-on-demand (DOD); Pulsed DC; Microdripping mode
类别
资金
- Center for Inorganic Photovoltaic Materials [NRF-2011-0007182, 2010-0010217]
- Korean government (MEST)
- Converging Research Center through the Ministry of Education Science and Technology [2010K000969]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Knowledge Economy, Republic of Korea [20104010100640]
For electrohydrodynamic-driven drop-on-demand printing techniques, either continuous-or pulsed-DC voltages can generate drops. To generate uniform micro-drops for high-resolution printing, the pulsed-DC voltage method is superior to continuous-DC voltage methods because of its controllability. Voltage amplitude and duration (or duty cycle or relaxation time, tau) are the primary parameters affecting the performance of drop-generation or ejection. When charge accumulates on the fluid meniscus at the nozzle, a drop is ejected. Charge density is the product of voltage (amplitude) and duration. In theory, charge densities from low-amplitude, long-duration voltages are equivalent to those of large amplitude and short duration. However, we demonstrate that drop-ejection mode differs significantly, despite equivalent products when voltage amplitude and duration change. At various voltage amplitudes and durations, four ejection main modes are identified: microdripping, spindle, string-jet, and spray modes. Longer voltage durations yield excessively large, spindle, string-jet, and spray modes. Conversely, no ejection is observed for short voltage durations. The microdripping mode, most desirable for uniform and high-resolution printing, appears for the narrowed range of duration under given pulsed-voltage. The identification map has been constructed for these modes; this map can be used as a guideline to yield a stable microdripping mode for high quality printing. (C) 2011 Elsevier Ltd. All rights reserved.
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