Contact force–based method for controlling the dispensing volume of ultra-micro-adhesive

Liu, Huifang; Chen, Ying; Chen, Xi; Jiang, Shenhui

doi:10.1007/s00170-022-09624-z

Cited by 3 publications

(3 citation statements)

References 27 publications

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“…The contact dispensing process can be divided into four stages: 1) liquid flow in the needle, 2) contact between the liquid and the substrate, 3) transfer of the liquid from the needle to the substrate, and 4) constrained spreading of the droplet (Yao et al, 2011;Liu et al, 2022). The mechanism of droplet formation is that after the liquid flows from the needle to the substrate, the liquid bridge is gradually narrowed and finally breaks due to lifting of the needle, achieving transfer of the liquid to form a complete droplet.…”

Section: Resultsmentioning

confidence: 99%

“…The contact dispensing process is typically composed of four stages, namely, extrusion, deposition, stretching, and breakage (Chen et al, 2009;Liu et al, 2022). The dispensing tip first approaches the substrate, and the needle gradually approaches the substrate to allow the conductive adhesive to contact the substrate.…”

Section: Open Accessmentioning

confidence: 99%

“…Due to its simple process, contact dispensing has been widely applied in various fields of electronic packaging, such as auto parts, LED lamps, and electronic components (Yao et al, 2011;Zhu et al, 2018;Liu et al, 2022). With continuous improvements in manufacturing technology, electronic components have become increasingly miniaturized, and their morphology requirements have become more demanding (Lu et al, 2008;Luo et al, 2016;Chen et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Modeling the contact dispensing process of conductive adhesives with different viscosities and optimization of droplet deposition

et al. 2023

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Introduction: The contact dispensing process is composed of extrusion, stretching, and liquid bridge breakage, which is greatly impacted by the viscosity and surface tension of the dispensed liquid and the contact angle between the liquid and the substrate. Regarding contact dispensing of conductive adhesives, few studies have investigated the influence of the viscosity of conductive adhesives on the dispensing process.Methods: In the present study, computer simulation was used to explore the contact dispensing process of high-viscosity adhesives, and a dispensing device was designed to verify the simulation results.Results and discussion: The results showed that the viscosity of the adhesives had the greatest influence on the dispensing process, and the higher the viscosity, the more difficult it was to break the liquid bridge, which seriously affected the stability of the contact dispensing process. In the dispensing process, once the adhesive had filled the gap between the needle tip and the substrate, increasing the dispensing time caused the diameter of the droplet to increase. Decreasing the lifting speed of the needle allowed sufficient time for the adhesive surface to restore changes caused by stretching, thereby eliminating unstable droplets and achieving droplets with regular morphology. In conclusion, our results demonstrated that computer simulation is a powerful tool for providing key information to improve the contact dispensing process, obtain droplets with optimal morphology, and achieve excellent bonding between the conductive adhesive and the substrate.

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Section: Resultsmentioning

confidence: 99%

Section: Open Accessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modeling the contact dispensing process of conductive adhesives with different viscosities and optimization of droplet deposition

et al. 2023

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Study on the prediction method of ultra-micro adhesive transfer ratio based on controlling the change of physical parameters

Chen,

Liu,

Cong

et al. 2024

Experimental Thermal and Fluid Science

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A high-precision automated liquid pipetting device with an interchangeable tip

Yang,

Wang,

et al. 2023

Review of Scientific Instruments

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Liquid handling is a necessary act to deal with liquid samples from scientific labs to industry. However, existing pipetting devices suffer from inaccuracy and low precision when dealing with submicroliter liquids, which significantly affect their applications in low-volume quantitation. In this article, we present an automated liquid pipetting device that can aspirate liquid from microplates and dispense nanoliter droplets with high precision. Liquid aspiration is realized by using a micropump and a solenoid valve, and on-demand nanoliter droplet printing is realized by using a low-cost and interchangeable pipette tip combined with a piezoelectric actuator. Based on the microfluidic printing technology, the volumetric coefficient of variation of the dispensed liquid is less than 2% below 1 µl. A demonstration of concentration dilution for quantitative analysis has been successfully performed using the automated liquid pipetting device, demonstrating its potential in low-volume liquid handling for a wide range of biomedical applications.

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Contact force–based method for controlling the dispensing volume of ultra-micro-adhesive

Cited by 3 publications

References 27 publications

Modeling the contact dispensing process of conductive adhesives with different viscosities and optimization of droplet deposition

Modeling the contact dispensing process of conductive adhesives with different viscosities and optimization of droplet deposition

Study on the prediction method of ultra-micro adhesive transfer ratio based on controlling the change of physical parameters

A high-precision automated liquid pipetting device with an interchangeable tip

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