Droplet Behaviors on Substrates in Thin-Film Formation Using Ink-Jet Printing

Ikegawa, Masahiro; Azuma, Hitoshi

doi:10.1299/jsmeb.47.490

Cited by 53 publications

(29 citation statements)

References 26 publications

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“…Furthermore, our observations can help understand how bacteria and other motile microorganisms can adapt to environments that undergo periodic drying through their mobility. The possibility of influencing the coffee ring effect with active matter is not only relevant for several biophysical phenomena, such as the formation of biofilms and the spreading of pathogens in environments subject to periodic drying, but also for technological applications in printing, 41 coating, 42 thin film deposition, 43,44 self-assembly of nanostructures, [45][46][47] where active matter could become an additional degree of freedom to dynamically control these processes. 48,49…”

Section: Discussionmentioning

confidence: 99%

Active matter alters the growth dynamics of coffee rings

et al. 2019

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Active matter in a drying droplet alters the growth dynamics of coffee rings and leads to a more uniform distribution. Andac et al . investigate experimentally the drying process of a droplet containing suspended colloids in presence of motile bacteria, and find that the effect is particularly relevant in the case of slowly drying droplets. The experimental results are reproduced in the numerical simulation of a minimalistic model.

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Section: Discussionmentioning

confidence: 99%

Active matter alters the growth dynamics of coffee rings

et al. 2019

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“…4(b), the silver line appears with a nonuniform surface whose edges are thicker than the middle area. It is mainly caused by the coffee-ring effect resulting from the difference of the evaporation rate on the surface of the droplet that will drive the solute to the edge, i.e., contact line [48]. Fig.…”

Section: Methodsmentioning

confidence: 99%

A Combined Process of Liftoff and Printing for the Fabrication of Scalable Inkjet Printed Microstructures on a Flexible Substrate

Liang

Cheng

et al. 2015

IEEE Trans. Electron Devices

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In this paper, a combined process of liftoff and printing (CPLoP) techniques is introduced to realize size-scalable printed silver microstructures with line widths ranging from 5 to 70 μm and resistivities of ∼9.8 μ · cm on a flexible polyimide substrate via thermal sintering at 300°C for 30 min. In addition, a printed interdigitated capacitor with an electrode line width and spacing of 10 μm and a printed spiral square inductor with a 10-μm line width and 5-μm spacing in an area of 1 mm 2 have been successfully demonstrated with an area capacitance and inductance of 0.43 pF/mm 2 at 10 KHz and 1.054 μH/mm 2 up to 100 KHz, respectively, which are the orders of magnitude performance improvement in comparison with the contemporary inkjet-printed capacitors and inductors. Owing to the significant reduction of energy demand in processing tools and waste generation in processing materials, the results have revealed that the CPLoP process can facilitate the advancement of printing manufacture technology for microelectronics applications.

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“…Droplet spreading and surface wetting depend on droplet dynamics (Weber and Reynolds numbers), the impact on the substrate, as well as surface wettability characteristics. 2 Impinging droplets on a substrate spread, usually merge and coalesce under favorable conditions, forming a thin liquid film, which subsequently dries, leaving behind a thin solid film. A higher Weber number results in a better spreading, although there is a threshold beyond which droplet splashing occurs, which is usually detrimental to the quality of the film and should be avoided.…”

Section: Introductionmentioning

confidence: 99%

Substrate vibration-assisted spray coating (SVASC): significant improvement in nano-structure, uniformity, and conductivity of PEDOT:PSS thin films for organic solar cells

Zabihi

Eslamian

2015

J Coat Technol Res

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In an attempt to improve surface wetting and coating characteristics, a novel technique, i.e., imposing ultrasonic vibration on the substrate, is introduced. This technique is combined with conventional ultrasonic spray coating, thus substrate vibration-assisted spray coating (SVASC), and is employed to fabricate PEDOT:PSS thin films. PEDOT:PSS is a co-polymer, commonly used as solar cell buffer layers and thin-film electrodes. Advanced surface characterization techniques, such as atomic force microscopy and confocal laser scanning microscopy are utilized. The results show that the application of the imposed vibration on the substrate results in a significant decrease in surface roughness, film thickness, and the number of defects and pin-holes. In terms of the film functionality, the electrical conductivity of the PED-OT:PSS films made using the SVASC technique shows a four-time increase, compared to those made by conventional ultrasonic spray coating. In conventional ultrasonic spray coating, increasing the number of spray passes or deposition layers usually improves the coating uniformity. For aqueous PEDOT:PSS solution and within the range of the values of the parameters investigated in this work, with imposed substrate vibration, the number of spray passes is immaterial, as far as the film uniformity is concerned. However, the application of multiple spray passes enhances the film's electrical conductivity. Our unprecedented results on the combined substrate vibration with spray coating provide a platform for low-cost fabrication of solutionprocessed thin-film solar cell devices, and a forward step toward commercialization of emerging solar cells, such as polymer and perovskite solar cells. The positive effect of using imposed substrate vibration on spray-on solar cell thin films may be deployed in other coating (e.g., spin coating) and spray coating applications as well.

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Droplet Behaviors on Substrates in Thin-Film Formation Using Ink-Jet Printing

Cited by 53 publications

References 26 publications

Active matter alters the growth dynamics of coffee rings

Active matter alters the growth dynamics of coffee rings

A Combined Process of Liftoff and Printing for the Fabrication of Scalable Inkjet Printed Microstructures on a Flexible Substrate

Substrate vibration-assisted spray coating (SVASC): significant improvement in nano-structure, uniformity, and conductivity of PEDOT:PSS thin films for organic solar cells

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