Electrohydrodynamic drop-on-demand patterning in pulsed cone-jet mode at various frequencies

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The patterning of a series of drops was investigated by the electrohydrodynamic printing method in the drop-on-demand fashion. A positive pulse voltage was applied to the capillary nozzle periodically to eject a pulsed liquid jet. The ejected jet was directed to the moving substrate, to which DC bias voltage was applied. High-speed imaging revealed that a Taylor cone was established at the nozzle tip during the ejection of the liquid jet, and that the jet directly struck the substrate to form a drop without the jet break-up. The frequency of drop generation can be controlled precisely, because the frequency of the pulsed voltage was almost same as the pulsating frequency of the liquid in pulsed cone-jet mode. The deposited patterns showed a series of uniformly sized drops with a regular spacing. At the pulse voltage frequency of 25 Hz, the diameter of the drops was approximately 95 mu m. Using this drop-on-demand method, it is feasible to produce a variety of patterns of dots and continuous/discontinuous lines. (C) 2008 Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2008-09
Language
ENG
Article Type
Article
Keywords

ELECTRIC-FIELD; DEPOSITION; PULSATION; POLYMERS; SURFACES; VOLTAGE

Citation

JOURNAL OF AEROSOL SCIENCE, v.39, pp.819 - 825

ISSN
0021-8502
DOI
10.1016/j.jaerosci.2008.05.001
URI
http://hdl.handle.net/10203/10078
Appears in Collection
ME-Journal Papers(저널논문)
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