The effect of driving waveforms on droplet formation in a piezoelectric inkjet nozzle

Shin, Pyungho; Sung, Jaeyong

doi:10.1109/eptc.2009.5416559

Cited by 6 publications

(7 citation statements)

References 5 publications

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“…The performance of the droplet ejection process can be characterized by responses such as the droplet velocity, volume, consistency, shape and directionality. These parameters are affected by factors such as the fluid properties, nozzle geometry and waveform design (Kwon, 2009, 2010; Shin and Sung, 2009; Gan et al , 2009; Liou et al , 2010; Wijshoff, 2010; Tekin et al , 2008). The effects of these factors have been the subject of many experimental (Dong et al , 2006a, b) and computational studies (Bogy and Talke, 1984; Xu and Basaran, 2007).…”

Section: Principles Of Inkjet Printingmentioning

confidence: 99%

Inkjet printing of conductive materials: a review

2012

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PurposeThe purpose of this paper is to present an exhaustive review of research studies and activities in the inkjet printing of conductive materials.Design/methodology/approachThis paper gives a detailed literature survey of research carried out in inkjet printing of conductive materials.FindingsThis article explains the inkjet printing process and the various types of conductive inks. It then examines the various factors that affect the quality of inkjet printed interconnects such as printing parameters, materials and substrate treatments. Methods of characterising both the inkjet printing process and the electrical properties of printed conductive materials are also presented. Finally relevant applications of this technology are described.Originality/valueInkjet printing is currently one of the cheapest direct write techniques for manufacturing. The use of this technique in electronic manufacturing, where interconnects and other conductive features are required is an area of increasing relevance to the fields of electronics manufacturing, packaging and assembly. This review paper would therefore be of great value and interest to this community.

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Section: Principles Of Inkjet Printingmentioning

confidence: 99%

Inkjet printing of conductive materials: a review

2012

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“…The key to success in this regard was an adaptation of the pulse shape of the piezoelectric signal. In detail, compared to the conventionally employed pulse shape, the initial voltage was drastically reduced to 5 V while the amplitude was increased to approximately 25 V. Shin et al previously proposed a double-trapezoid waveform to reduce satellite formation for low-viscosity inks . By altering the break time between the two pulses, the liquid momentum is reduced and thus satellite formation is suppressed.…”

Section: Discussionmentioning

confidence: 99%

“…In detail, compared to the conventionally employed pulse shape, the initial voltage was drastically reduced to 5 V while the amplitude was increased to approximately 25 V. Shin et al previously proposed a double-trapezoid waveform to reduce satellite formation for low-viscosity inks. 66 By altering the break time between the two pulses, the liquid momentum is reduced and thus satellite formation is suppressed. The short single spike in the used pulse shape is supposed to have the same effect, counteracting the satellite-forming Rayleigh instability often visible for low-viscosity liquids.…”

Section: ■ Discussionmentioning

confidence: 99%

Itraconazole Nanocrystals on Hydrogel Contact Lenses via Inkjet Printing: Implications for Ophthalmic Drug Delivery

Tetyczka

Brisberger

Reiser

et al. 2022

ACS Appl. Nano Mater.

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The therapeutic effect of common ocular drug delivery systems is often limited because tear fluid, protective biological barriers, and the blink reflex prevent drugs from reaching their target. Combining nanodrug delivery systems with contact lenses is one approach to increase the precorneal residence time and thus the drug concentration in the eye. Hence, the aim of this study was to selectively print itraconazole (ITZ) nanocrystals on commercially available 1 day soft hydrogel contact lenses using inkjet printing. For this, ITZ nanocrystals stabilized with Poloxamer 407 were prepared and optimized via wet media milling. After careful characterization, the nanocrystals were printed into vials, the printing process was adjusted, and the characteristics of the nanoformulation after printing were investigated. Finally, nanocrystals were printed onto hydrogel contact lenses. By performing a concise design of experiments (DoE), stable nanocrystals with a size of approximately 200 nm, a narrow particle size distribution, a negative surface charge, and an almost spherical shape were obtained. Compared to the bulk material, the apparent solubility was significantly increased and no changes in the solid-state behavior occurred. It was further demonstrated that inkjet printing did not affect the characteristics of the nanocrystals. Multiple layers of the ITZ nanoformulation were printed on soft hydrogel 1 day contact lenses, and a dual drug release profile was obtained in simulated tear fluid. These results clearly show that printing on contact lenses is a promising application for ophthalmic drug delivery.

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“…However, during droplet generation, many satellite droplets were produced, leading to a wide size distribution of the droplets. Shin et al [ 23 ] also reported that, for low viscosity liquid, satellites were generated when a single-pulse waveform was applied, whereas when a double-pulse waveform was utilized, the satellites were eliminated. A simple change in the time separation can precisely control the droplet size.…”

Section: Introductionmentioning

confidence: 99%

Formation and Elimination of Satellite Droplets during Monodisperse Droplet Generation by Using Piezoelectric Method

Yang

et al. 2021

Micromachines

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One of the key questions in the generation of monodisperse droplets is how to eliminate satellite droplets. This paper investigates the formation and elimination of satellite droplets during the generation of monodisperse deionized water droplets based on a piezoelectric method. We estimated the effects of two crucial parameters—the pulse frequency for driving the piezoelectric transducer (PZT) tube and the volume flow rate of the pumping liquid—on the generation of monodisperse droplets of the expected size. It was found that by adjusting the pulse frequency to harmonize with the volume flow rate, the satellite droplets can be eliminated through their coalescence with the subsequent mother droplets. An increase in the tuning pulse frequency led to a decrease in the size of the monodisperse droplets generated. Among three optimum conditions (OCs) (OC1: 20 mL/h, 20 kHz; OC2: 30 mL/h, 30 kHz; and OC3: 40 mL/h, 40 kHz), the sizes of the generated monodisperse deionized water droplets followed a bimodal distribution in OC1 and OC2, whereas they followed a Gaussian distribution in OC3. The average diameters were 87.8 μm (OC1), 85.9 μm (OC2), and 84.8 μm (OC3), which were 8.46%, 6.14%, and 4.69% greater than the theoretical one (81.0 μm), respectively. This monodisperse droplet generation technology is a promising step in the production of monodisperse aerosols for engineering applications.

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The effect of driving waveforms on droplet formation in a piezoelectric inkjet nozzle

Cited by 6 publications

References 5 publications

Inkjet printing of conductive materials: a review

Inkjet printing of conductive materials: a review

Itraconazole Nanocrystals on Hydrogel Contact Lenses via Inkjet Printing: Implications for Ophthalmic Drug Delivery

Formation and Elimination of Satellite Droplets during Monodisperse Droplet Generation by Using Piezoelectric Method

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