Abstract
Inkjet printing of a liquid suspension prepared by dispersing silver powders of size around4 nm in deionized (DI) water at 30 wt% was investigated in this study. By comparing withthe results of pure DI water, the effects of nanoparticles on droplet formation between thenozzle and the substrate were also studied. A bipolar pulse waveform was employed indriving the piezoelectric printhead with pulse voltage set as the primary variable of thisstudy. Observations showed that a higher driving pulse voltage was required for thesilver suspension to form droplets than DI water. The liquid column broke upat the nozzle orifice for DI water while the silver suspension broke up furtheraway below the nozzle office. It was also observed that the droplet size of thesilver suspension was smaller than that of DI water. For the silver suspension theliquid column formed was thinner and longer and the pinch-off time of the liquidcolumn to form droplets was also longer. However, the characteristic adjustmenttime for droplet recombination was shorter for the silver suspension than for DIwater.
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