Drop-on-demand painting of highly viscous liquids

Kamamoto, Kyota; Onuki, Hajime; Tagawa, Yoshiyuki

doi:10.1017/flo.2021.7

Cited by 4 publications

(1 citation statement)

References 18 publications

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“…The first category involves utilizing the focusing effect of the concave meniscus, which naturally exists at the nozzle. For example, the Tagawa group developed a device for printing high-viscosity liquids that used this effect. , However, this method has limitations as it requires the printed liquid to have a contact angle with the nozzle material of less than 90°. The second category involves using external actuation to control the motion of the meniscus.…”

Section: Introductionmentioning

confidence: 99%

Droplet Printing Enabled by Cavity Collapse Ejection

Wang,

Yang,

Wang

et al. 2023

Langmuir

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The behavior of cavity collapse in liquids is of fundamental importance in natural and industrial applications. It is still challenging to use the phenomenon of cavity collapse ejection in on-demand droplet printing technology. In this study, we investigate the cavity collapse ejection phenomenon in the submillimeter to millimeter scale and demonstrate that the cavity capillary energy is a critical factor affecting the state of the generated jet. Based on this phenomenon, we developed a droplet printing technology that can print nanoliter satellite-free droplets from a millimeter-sized nozzle, which reduces the risk of nozzle clogging. Using this printing technology, we demonstrated the printing of a nanoparticle suspension with 60% mass loading. Finally, we also showcased the printing of various inks for different applications using this technology, demonstrating the printability of cavity collapse-ejection printing technology in functional inks and showing potential to be applied in scenarios such as bioassays, the electronics industry, and additive manufacturing.

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Section: Introductionmentioning

confidence: 99%

Droplet Printing Enabled by Cavity Collapse Ejection

Wang,

Yang,

Wang

et al. 2023

Langmuir

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Focused, high-speed liquid jets induced via low-voltage sparks in capillary tubes

Rohilla

Marston

2023

Exp Fluids

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The effects of secondary cavitation position on the velocity of a laser-induced microjet extracted using explainable artificial intelligence

Igarashi,

Yee,

Yokoyama

et al. 2024

Physics of Fluids

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The control of the velocity of a high-speed laser-induced microjet is crucial in applications such as needle-free injection. Previous studies have indicated that the jet velocity is heavily influenced by the volumes of secondary cavitation bubbles generated through laser absorption. However, there has been a lack of investigation of the relationship between the positions of secondary cavitation bubbles and the jet velocity. In this study, we investigate the effects of secondary cavitation on the jet velocity of laser-induced microjets extracted using explainable artificial intelligence (XAI). An XAI is used to classify the jet velocity from images of secondary cavitation and to extract features from the images through visualization of the classification process. For this purpose, we run 1000 experiments and collect the corresponding images. The XAI model, which is a feedforward neural network (FNN), is trained to classify the jet velocity from the images of secondary cavitation bubbles. After achieving a high classification accuracy, we analyze the classification process of the FNN. The predictions of the FNN, when considering the secondary cavitation positions, show a higher correlation with the jet velocity than the results considering only secondary cavitation volumes. Further investigation suggested that secondary cavitation that occurs closer to the laser focus position has a higher acceleration effect. These results suggest that the velocity of a high-speed microjet is also affected by the secondary cavitation position.

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Drop-on-demand painting of highly viscous liquids

Abstract: Graphical Abstract

Cited by 4 publications

References 18 publications

Droplet Printing Enabled by Cavity Collapse Ejection

Droplet Printing Enabled by Cavity Collapse Ejection

Focused, high-speed liquid jets induced via low-voltage sparks in capillary tubes

The effects of secondary cavitation position on the velocity of a laser-induced microjet extracted using explainable artificial intelligence

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