Development of a drop-on-demand droplet generator for one-drop-fill technology

Fan, Kuang‐Chao; Chen, Jhih-Yuan; Wang, Ching-Hua; Pan, Wen-Chueh

doi:10.1016/j.sna.2008.03.006

Cited by 79 publications

(50 citation statements)

References 14 publications

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“…Previous studies have shown that the size and behavior of ejected droplets depend on the pulse width and voltage of the piezoelectric driving waveform (Fan et al 2008;Reis et al 2005;Shin et al 2011;Tsai and Hwang 2008). Figure 4 shows the changing system behavior as the pulse width is increased.…”

Section: Resultsmentioning

confidence: 95%

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mentioning

confidence: 99%

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A low-cost, precise piezoelectric droplet-on-demand generator

2015

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repeatable experiments require a reliable and precise droplet generation technique.Repeatable droplet generation is also required for a number of diverse applications ranging from inkjet printing to liquid crystal display manufacturing (Fan et al. 2008). A variety of droplet-on-demand (DOD) generators are described in the literature, but most existing designs are complex, costly, and difficult to adopt for use in other studies. Many systems are designed for the generation of droplets smaller than 500 μm in diameter (Bransky et al. 2009;Reis et al. 2005; Meacham et al. 2005; Perçin and KhuriYakub 2003;Cheng and Chandra 2003;Goghari and Chandra 2008;Chen and Basaran 2002;Dong et al. 2006;Switzer 1991), below the desired range for the walking droplet experiments. We here describe a simple, repeatable DOD system designed specifically for this range, 0.5-1.3 mm (Protiere et al. 2006;Moláček and Bush 2013).The present device is inspired by the design of Yang et al. (1997) which ejects a droplet from a nozzle at the base of a fluid chamber by contracting a piezoelectric disk sealed to the top of the chamber. They used a fixed fluid reservoir and custom-fabricated glass nozzles. For a range of nozzles 125-250 μm in diameter, they found an overall variability in size of <10 % of the measured droplet diameters (<500 μm). Their device has since been adopted for relatively large-scale drop (diameters >500 μm) generation (Mehdizadeh et al. 2004;Hawke 2006). Castrejón-Pita et al. (2008) used a loudspeaker to actuate their DOD generator and fabricated interchangeable nozzle plates ranging from 0.15 to 3.00 mm in diameter. A fluid reservoir of adjustable height allowed for control of the pressure at the nozzle outlet. For fixed control parameters, the device was stated to have an overall variability of droplet size of <5 %. Terwagne (2011) successfully designed and employed a DOD generator to produce droplets for their own bouncing Abstract We present the design of a piezoelectric droplet-on-demand generator capable of producing droplets of highly repeatable size ranging from 0.5 to 1.4 mm in diameter. The generator is low cost and simple to fabricate. We demonstrate the manner in which droplet diameter can be controlled through variation of the piezoelectric driving waveform parameters, outlet pressure, and nozzle diameter.

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Section: Resultsmentioning

confidence: 95%

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confidence: 99%

A low-cost, precise piezoelectric droplet-on-demand generator

2015

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“…A droplet generator can operate in either one of two dispensing modes: CS or DoD (Fan et al 2008;Castrejón-Pita et al 2008;Cooley et al 2001;Le 1998). …”

Section: Droplet Dispensing Modementioning

confidence: 99%

“…A common method of controlling that rate and pressure is by varying the reservoir height relative to the generator. As droplets are generated and the reservoir liquid amount decreases, the reservoir height relative to the droplet generator increases, maintaining constant pressure (Fan et al 2008;Castrejón-Pita et al 2008). …”

Section: Flow-inmentioning

confidence: 99%

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Microdroplet generation in gaseous and liquid environments

Ben-Tzvi

Rone

2009

Microsyst Technol

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As trends in biology, chemistry, medicine and manufacturing have pushed macroscopic processes onto the micro scale, droplet generation has been a key factor in allowing these methods to translate. For both surface-based liquid-in-gas generation and lab-on-a-chip-based liquid-inliquid generation, the ability to create small monodisperse liquid droplets is critically important in constructing reliable and practical devices. This article reviews liquid microdroplet generation in gaseous and liquid environments, covering the general characteristics of generators and the specific methods and technologies used for generation. Furthermore, this study compiles the issues encountered when operating generators, and the measurements and instrumentation used to characterize generated droplets. Applications of droplet generation in printing, analysis, synthesis and manufacturing are also discussed.

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Laser Transfer of Metals and Metal Alloys for Digital Microfabrication of 3D Objects

Zenou

Sa’ar

Kotler³

2015

Small

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3D copper logos printed on epoxy glass laminates are demonstrated. The structures are printed using laser transfer of molten metal microdroplets. The example in the image shows letters of 50 µm width, with each letter being taller than the last, from a height of 40 µm ('s') to 190 µm ('l'). The scanning microscopy image is taken at a tilt, and the topographic image was taken using interferometric 3D microscopy, to show the effective control of this technique.

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Development of a drop-on-demand droplet generator for one-drop-fill technology

Cited by 79 publications

References 14 publications

A low-cost, precise piezoelectric droplet-on-demand generator

A low-cost, precise piezoelectric droplet-on-demand generator

Microdroplet generation in gaseous and liquid environments

Laser Transfer of Metals and Metal Alloys for Digital Microfabrication of 3D Objects

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