Drop-On-Demand Inkjet Printing of SU-8 Polymer

Fakhfouri, V.; Mermoud, Grégory; Kim, Joo Yeon; Martinoli, Alcherio; Brugger, Juergen

doi:10.2174/1876402910901010063

Cited by 28 publications

(23 citation statements)

References 14 publications

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“…Among numerous actuators, piezoelectric printheads are most commonly used in research as they generate droplets through deformation of the element causing a pressure wave to propagate through the inkjet nozzle. This distinct droplet formation mechanism is compatible with a wider range in the rheology of the printed inks (Yang et al 1997;Schoeppler 2006;Fakhfouri et al 2009;Magdassi 2009) when compared to other droplet generation systems such as thermal inkjet printheads. As a result, piezoelectric DOD inkjet printers have been used for printing colloidal suspensions in numerous life science applications including proteomics, DNA sequencing, therapeutics and tissue engineering (Chee et al 1996;Lemmo et al 1998;Cooley et al 2001;Boland et al 2006;Chahal et al 2012;Lorber et al 2014;Xu et al 2014).…”

Section: Introductionsupporting

confidence: 58%

Measurement of the oscillatory flow field inside tapered cylindrical inkjet nozzles using micro-particle image velocimetry

Cheng

Ahmadi

Cheung

2015

Microfluid Nanofluid

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Section: Introductionsupporting

confidence: 58%

Measurement of the oscillatory flow field inside tapered cylindrical inkjet nozzles using micro-particle image velocimetry

Cheng

Ahmadi

Cheung

2015

Microfluid Nanofluid

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“…SU-8 is an epoxy-based negative photoresist which has a high optical transparency from the visible to the near-infrared and a high refractive index (n= 1.63). Fakhfouri et al used a single-nozzle printhead and applied more than hundreds of volts on the piezoelectric crystal in order to enable the jetting of SU-8 photoresist [33]. Chen et al [34] diluted SU-8 photoresist to decrease its viscosity and found stable jetting for voltages of V~ 30V and pulse duration around 30 µs according the nozzle diameter.…”

Section: Ink Formulation and Inkjet Printing (Ijp)mentioning

confidence: 99%

“…Rhodamine 640 is solubilized in ethanol at 4x10 -2 mol/L and Pyromethene 597 is solubilized in ethanol at 6x10 -2 mol/L. EMD 6415 ink has a viscosity of 11-13 cPo at 50°C and a surface tension of 35-37 mN.m −1 [33]. The EMD 6415 ink is mainly based on acrylic monomers (25-40% vol.…”

Section: Ink Formulation and Inkjet Printing (Ijp)mentioning

confidence: 99%

Inkjet-printed vertically emitting solid-state organic lasers

Mhibik

Chénais

Forget

et al. 2016

Journal of Applied Physics

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International audienceIn this paper, we show that Inkjet Printing can be successfully applied to external-cavity vertically-emitting thin-film organic lasers, and can be used to generate a diffraction-limited output beam with an output energy as high as 33.6 µJ with a slope efficiency S of 34%. Laser emission shows to be continuously tunable from 570 to 670 nm using an intracavity polymer-based Fabry-Perot etalon. High-optical quality films with several µm thicknesses are realized thanks to ink-jet printing. We introduce a new optical material where EMD6415 commercial ink constitutes the optical host matrix and exhibits a refractive index of 1.5 and an absorption coefficient of 0.66 cm-1 at 550-680 nm. Standard laser dyes like Pyromethene 597 and Rhodamine 640 are incorporated in solution to the EMD6415 ink. Such large size " printed pixels " of 50 mm 2 present uniform and flat surfaces, with roughness measured as low as 1.5 nm in different locations of a 50µm x 50µm AFM scan. Finally, as the gain capsules fabricated by Inkjet printing are simple and do not incorporate any tuning or cavity element, they are simple to make, have a negligible fabrication cost and can be used as fully disposable items. This works opens the way towards the fabrication of really low-cost tunable visible lasers with an affordable technology that has the potential to be widely disseminated

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“…More recently, it has been actively studied also for the manufacture of functional thin films, including conductive metal tracking (Dearden et al 2005;Xue et al 2006;Sivaramakrishnan et al 2007;Osch et al 2008;Soltman & Subramanian 2008;Meier et al 2009;Perelaer et al 2009;Anto et al 2010), polymer organic L.-Y. Wong and others semiconductor devices (Kobayashi et al 2000;Sirringhaus et al 2000;Duineveld et al 2002;Kawase et al 2003;Arias et al 2004;Bale et al 2006;Berggren, Nilsson & Robinson 2006;Xia & Friend 2006;Li et al 2007;Aernouts et al 2008;Hoth et al 2008;Singh et al 2009), photoresist films (Fakhfouri et al 2009) and bio-films (Newman, Turner & Marrazza 1992;Hughes et al 2001;Roth et al 2004;Nakamura et al 2005). There are two principle modes of operation in IJP: (i) continuous IJP, in which a continuous stream of ink is periodically perturbed to generate droplets; and (ii) droplet-on-demand IJP, in which these droplets are ejected using pressure pulses (Wijshoff 2010).…”

Section: Introductionmentioning

confidence: 99%

Jettable fluid space and jetting characteristics of a microprint head

Wong

Lim

et al. 2012

J. Fluid Mech.

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The influence of fluid droplet properties on the droplet-on-demand jetting of a Newtonian model fluid (water-isopropanol-ethylene glycol ternary system) has been studied. The composition of the fluid was adjusted to investigate how the Ohnesorge number (Oh) influences droplet formation (morphology and speed) by a microfabricated short-channel shear-mode piezoelectric transducer. The fluid space for satellite-free single droplet formation was indeed found to be bound by upper and lower Oh limits, but these shift approximately linearly with the piezo pulse voltage amplitude V o , which has a stronger influence on jetting characteristics than pulse length. Therefore the jettable fluid space can be depicted on a V o -Oh diagram. Satellite-free droplets of the model fluid can be jetted over a wide Oh range, at least 0.025 to 0.5 (corresponding to Z = Oh −1 of 40 to 2), by adjusting V o appropriately. Air drag was found to dominate droplet flight, as may be expected. This can be accurately modelled to yield droplet formation time, which turned out to be 20-30 µs under a wide range of jetting conditions. The corresponding initial droplet speed was found to vary linearly with V o , with a fluid-dependent threshold but a fluid-independent slope, and a minimum speed of about 2 m s −1 . This suggests the existence of isovelocity lines that run substantially parallel to the lower jetting boundary in the V o -Oh diagram.

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Drop-On-Demand Inkjet Printing of SU-8 Polymer

Cited by 28 publications

References 14 publications

Measurement of the oscillatory flow field inside tapered cylindrical inkjet nozzles using micro-particle image velocimetry

Measurement of the oscillatory flow field inside tapered cylindrical inkjet nozzles using micro-particle image velocimetry

Inkjet-printed vertically emitting solid-state organic lasers

Jettable fluid space and jetting characteristics of a microprint head

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