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Methodology to set up nozzle-to-substrate gap for high resolution electrohydrodynamic jet printing
O. Gennari, L. Battista, B. Silva, S. Grilli, L. Miccio, V. Vespini, S. Coppola, P. Orlando, L. Aprin, P. Slangem, and P. Ferraro, Appl. Phys. Lett. 106, 054103 (2015).
S. Coppoia, L. Mecozzi, V. Vespini, L. Battista, S. Grilli, G. Nena, F. Loffredo, F. Lofferdo, F. Villani, C. Minarini, and P. Ferraro, Appl. Phys. Lett. 106, 261603 (2015).
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Several efforts have been made for the prediction of jet diameter in electrohydrodynamic
jet printing; however, not much attention has been paid to the jet length, which is the distance from the cone apex to the location where the jet is unstable and is broken into atomized droplets. In this study, we measured both the cone length and the jet length using a high-speed camera, and measured the line pattern width with an optical microscope to investigate the effects of cone length and jet length on the pattern quality. Measurements were carried out with variations in nozzle diameter, flow rate, and applied voltage. The pattern width was theoretically predicted for the case when the nozzle-to-substrate distance was more than the cone length, and smaller than the summation of the cone and jet lengths (which is the case when there is no jet breakup).
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