Control of droplet formation for low viscosity fluid by double waveforms applied to a piezoelectric inkjet nozzle

Shin, Pyungho; Sung, Jaeyong; Lee, Myeong Ho

doi:10.1016/j.microrel.2010.11.017

Cited by 94 publications

(61 citation statements)

References 19 publications

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“…Experiments were performed with varying regimes of Reynolds and Weber numbers to validate the inkjet device. 10 A comprehensive investigation including actuating waveform, ink property, and nozzle size was explored by Liou et al 11 with microflow visualization and computational fluid dynamics. Further, Jang et al 7 explored droplet formation process experimentally to investigate the influences of ink properties on the inkjet printability and quality of products.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the voltage waveform as an important factor could significantly influence the droplet formation dynamics 8 and droplet volume, 9 particularly for the droplet modulation with low viscosity. 10 A comprehensive investigation including actuating waveform, ink property, and nozzle size was explored by Liou et al 11 with microflow visualization and computational fluid dynamics. A detailed review including overall aspects of DoD inkjet process was presented by Wijshoff.…”

Section: Introductionmentioning

confidence: 99%

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The role of wettability of nonideal nozzle plate: From drop‐on‐demand droplet jetting to impact on solid substrate

Zhang

Jia

et al. 2018

AIChE Journal

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The dynamics of drop‐on‐demand (DoD) droplet formation and subsequently impact on the solid substrate are investigated using a three‐dimensional (3‐D) multirelaxation‐time (MRT) pseudopotential lattice Boltzmann (LB) model. The wettability of nonideal nozzle plate and solid substrate is modeled by a geometric scheme within the LB framework. The dynamics of droplet formation are explored in a range of the inverse of Ohnesorge number Z=4.95, 11.57, and 28.17, and the Reynolds number Re=39.6, 58.9, and 136.4. For Z=4.95, no satellite droplet is observed and the wettability of nozzle plate greatly influences the velocity and length of jetting fluids. For Z=11.57, the filament breakup and recombination are observed. The moment of filament breakup is delayed with advancing contact angle θA increasing. For Z=28.17 with Re=136.4, the primary and satellite droplets could not be recombined with θA=30° and θA=60° which agree with the literature. Whereas with θA=90°, the recombination occurs. The dynamics of subsequent oscillating droplet impact on the substrate are similar to that of equilibrium droplet which could obtain high‐resolution printed features. Consequently, considering θA=90° with large Z and Re numbers, the printable range could be extended which could help increase the printing frequency and boost the production outputs of inkjet printing. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2837–2850, 2018

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The role of wettability of nonideal nozzle plate: From drop‐on‐demand droplet jetting to impact on solid substrate

Zhang

Jia

et al. 2018

AIChE Journal

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“…To overcome the lower limit of fluid viscosity, double waveforms with two square pulses (Figure ) can be applied to control the droplet formation in the piezoelectric inkjet nozzle . With regard to the double waveforms, the effect of driving voltage (ΔU) and time separation (Δ t ) between the pulses was investigated.…”

Section: Resultsmentioning

confidence: 99%

Inkjet printing of polylactic acid on substrates prepared by fused deposition modeling and its potential for selective surface finishing

Köpplmayr

Mühlberger

2016

J of Applied Polymer Sci

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Fused deposition modeling (FDM) is an additive manufacturing technology commonly used for prototyping. One limiting aspect for the use in functional prototyping and small-lot production is the achievable surface roughness. The aim of this work was to investigate a potential method of processing polylactic acid (PLA), as it is commonly used for FDM printing, via inkjet technology. PLA solvent inks with different concentrations were prepared by dissolving PLA in 1,4-dioxane. The tested PLA substrates were prepared by FDM with different layer thicknesses and the change in surface roughness after multilayer inkjet printing was measured by a stylus profilometer. The surface roughness was reduced by up to 50% and further increasing the number of inkjet layers caused voids and PLA accumulations.

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“…Where ρ is the density of the fluid, σ is the surface tension factor, D is the diameter of the nozzle (equals to 56.6 µm for current inkjet microchip) and μ represents the viscosity. Actually, the range of Z to form droplets is between 4 and 14, and the satellite of the droplet sometimes was observed when Z > 6. The values of Z of different solvents were summarized (Table ).…”

Section: Resultsmentioning

confidence: 99%

Generation of picoliter droplets of liquid for electrospray ionization with piezoelectric inkjet

Luo

et al. 2013

J. Mass. Spectrom.

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We report the association of inkjet and electrospray ionization MS to detect picoliter droplet, where the liquid volume and its position onto the tip can be precisely controlled to form ultrafine droplets for successive ionization of the analyte. Single rectangle pulse was applied to piezoelectric device on inkjet microchip for the ejection of each picoliter droplet, and it was controlled by a computer. The voltage and width of driving pulse for the inkjet were optimized to make reproducible ejection of the solvent with low viscosity. The volume of each droplet was about 600 pl, and a trigger of 10 droplets was selected as the best inlet mode taking relative standard derivation of the droplets into consideration. The target substrate used with high voltage to form ionization was graphite, after several attempts with some materials. High-speed camera was used to capture the breaking-up process of a droplet. The distance between the inkjet nozzle and the tip was set at 2 cm to avoid short circuit. The influences on the mass intensity of the diameter of the tip, the volume and the concentration of the sample were examined. The tip with a small diameter performed greater intensity, and the limit of detection decreased, whereas the small volume of liquid played high ionization efficiency. Linear regression in the range between 1 and 200 ppm for caffeine was conducted, where internal standard theobromine was used. Some real samples were also detected with the instrument.

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Control of droplet formation for low viscosity fluid by double waveforms applied to a piezoelectric inkjet nozzle

Cited by 94 publications

References 19 publications

The role of wettability of nonideal nozzle plate: From drop‐on‐demand droplet jetting to impact on solid substrate

The role of wettability of nonideal nozzle plate: From drop‐on‐demand droplet jetting to impact on solid substrate

Inkjet printing of polylactic acid on substrates prepared by fused deposition modeling and its potential for selective surface finishing

Generation of picoliter droplets of liquid for electrospray ionization with piezoelectric inkjet

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