Drop-on-Demand Printing of Carbon Black Ink by Electrohydrodynamic Jet Printing

Back, Sung Yul; Song, Chi Ho; Yu, Seongil; Lee, Hyoung Jin; Kim, Beom Soo; Yang, Nam Yeol; Jeong, Soo Hoa; Ahn, Heejoon

doi:10.1166/jnn.2012.5370

Cited by 15 publications

(6 citation statements)

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“…The processes are influenced by interactions of electric field force, gravity, capillary force, viscous force, air resistance, and surface tension. Droplet generation in electrohydrodynamic jet printing can be affected by multiple factors, e.g., nozzle structure, process parameters, and solution properties [ 21 , 22 , 23 ]. Therefore, it is challenging and meaningful to investigate drop generation behavior in E-jet printing, which provides theoretical guidance for regulation of process parameters and design of printheads with high performance.…”

Section: Introductionmentioning

confidence: 99%

Simulation and Validation of Droplet Generation Process for Revealing Three Design Constraints in Electrohydrodynamic Jet Printing

Pan

Zeng

2019

Micromachines

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Droplet generation process can directly affect process regulation and output performance of electrohydrodynamic jet (E-jet) printing in fabricating micro-to-nano scale functional structures. This paper proposes a numerical simulation model for whole process of droplet generation of E-jet printing based on the Taylor-Melcher leaky-dielectric model. The whole process of droplet generation is successfully simulated in one whole cycle, including Taylor cone generation, jet onset, jet break, and jet retraction. The feasibility and accuracy of the numerical simulation model is validated by a 30G stainless nozzle with inner diameter ~160 μm by E-jet printing experiments. Comparing numerical simulations and experimental results, period, velocity magnitude, four steps in an injection cycle, and shape of jet in each step are in good agreement. Further simulations are performed to reveal three design constraints against applied voltage, flow rate, and nozzle diameter, respectively. The established cone-jet numerical simulation model paves the way to investigate influences of process parameters and guide design of printheads for E-jet printing system with high performance in the future.

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Section: Introductionmentioning

confidence: 99%

Simulation and Validation of Droplet Generation Process for Revealing Three Design Constraints in Electrohydrodynamic Jet Printing

Pan

Zeng

2019

Micromachines

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“…Therefore, it has been regarded as an effective technique for achieving large-scale MLAs on flexible substrates with low melting points. Conventional piezoelectric inkjet printing offers a limited printing resolution of <20 μm because of the lack of low pumping energy. , However, electrohydrodynamic (EHD) inkjet printing can realize printing resolution down to a few to tens of micrometers and a higher aspect ratio with the assistance of the electric field induced between a printing nozzle and target substrate. Hence, it can be speculated that the optical properties of MLAs or microlenses fabricated by EHD inkjet printing with drop-on-demand (DoD) strategy are distinct from those of conventional piezoelectric inkjet printing. − …”

Section: Introductionmentioning

confidence: 99%

Drop-on-Demand Electrohydrodynamic Jet Printing of Microlens Array on Flexible Substrates

Prasetyo

Yudistira

et al. 2023

ACS Appl. Polym. Mater.

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The inkjet-printing technique is regarded as an efficient method to fabricate microlens arrays used in digital cameras, medical endoscopes, displays, optical communication, and light source devices. The diameter, height, and aspect ratio of the microlens are the major contributors to these optical properties. Hence, the optical characteristics of the microlens array can vary with the type of inkjet-printing method. In this study, by employing electrohydrodynamic (EHD) jet printing with the drop-on-demand strategy, we fabricated microlenses and microlens arrays using a UV-curable photopolymer liquid on flexible poly(3,4-ethylenedioxythiophene):polystyrenesulfonate-coated poly(ethylene terephthalate). By controlling the number of printing drops, which is regarded as an efficient approach to control the dimension of the microlens, lenses with diameters of 11.9 ± 0.2 and 24.4 ± 0.5 μm and aspect ratio ranging from 0.22 to 0.33 were constructed. It was found that the focal length (15.44–26.79 μm), numerical aperture (0.39–0.46), and f-number (1.3–1.1) varied with the number of printing drops. The results demonstrate that the EHD-printed microlenses have a much shorter focal length, higher numerical aperture, and smaller f-number than the previously reported printed lenses. Hence, the EHD-printed microlens can be utilized to produce wide-angle-of-view applications and capture accurate images with insufficient light intensity. In addition, the proposed EHD-printing method may provide a cost-effective and simple route for manufacturing microlens arrays.

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“…An electric field-induced liquid ejection is mainly influenced by electric field intensity, gravity, capillary force, viscous force, and surface tension [ 31 , 32 , 33 ]. The dimensions of the liquid ejection system such as an orifice or a nozzle, the flow rate or solution properties also affect the dynamic behavior [ 32 , 33 , 34 , 35 ]. Especially, based on the electro-hydrodynamic (EHD) behavior of the liquid, a new printing system can overcome the limitations on the material type, geometry, and thickness of the receiving substrate [ 36 , 37 ].…”

Section: Introductionmentioning

confidence: 99%

Electric Field-Driven Liquid Metal Droplet Generation and Direction Manipulation

et al. 2021

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A gallium-based liquid metal got high attention recently, due to the excellent material properties that are useful in various research areas. We report here on electric field-induced liquid metal droplet generation and falling direction manipulation. The well-analyzed electro-hydrodynamic method is a selectable way to control the liquid metal, as the liquid metal is conductive. The electric field-induced liquid metal manipulation can be affected by the flow rate (0.05~0.2 mL/min), voltage (0~7 kV), and distance (15 and 30 mm) between electrodes, which changes the volume of the electric field-induced generated liquid metal droplet and the number of the generated droplets. When the electric field intensity increases or the flow rate increases, the generated droplet volume decreases, and the number of droplets increases. With the highest voltage of 7 kV with 15 mm between electrodes at the 0.2 mL/min flow rate, the lowest volume and the largest number of the generated droplets for 10 s were ~10 nL and 541, respectively. Additionally, we controlled the direction of the generated droplet by changing the electric field. The direction of the liquid metal droplet was controlled with the maximum angle of ~12°. Moreover, we exhibited a short circuit demonstration by controlling the volume or falling direction of the generated liquid metal droplet with an applied electric field.

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Drop-on-Demand Printing of Carbon Black Ink by Electrohydrodynamic Jet Printing

Cited by 15 publications

References 0 publications

Simulation and Validation of Droplet Generation Process for Revealing Three Design Constraints in Electrohydrodynamic Jet Printing

Simulation and Validation of Droplet Generation Process for Revealing Three Design Constraints in Electrohydrodynamic Jet Printing

Drop-on-Demand Electrohydrodynamic Jet Printing of Microlens Array on Flexible Substrates

Electric Field-Driven Liquid Metal Droplet Generation and Direction Manipulation

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