Jetting dynamics of Newtonian and non-Newtonian fluids via laser-induced forward transfer: Experimental and simulation studies

Kalaitzis, A.; Makrygianni, Marina; Theodorakos, Ioannis; Hatziapostolou, A.; Melamed, Semyon; Kabla, Ayala; Vega, Fernando de la

doi:10.1016/j.apsusc.2018.09.084

Cited by 42 publications

(28 citation statements)

References 32 publications

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“…1(a)), and the laser beam was focused on the ink/ donor substrate interface, through the f-theta lens of the galvanometric scanning system described below. The fabrication of patterns, such as lines, on the substrate has been accomplished by scanning the laser beam over the donor surface, creating in this way multiple jets which form overlapping droplets [37]. After the laser printing process is over, a sintering process is required so that the copper ink patterns obtain the desired electrical properties.…”

Section: Lift and Laser Sintering: Process And Setupmentioning

confidence: 99%

“…In this work the solvent diethylene glycol monobutyl ether (DGBE) was selected in order to impart a homogenous donor coating with acceptable wetting and drying rate, as well as printed geometry characteristics, taking into account the wetting properties of the receiving substrate. In addition, it has been shown in [37] that printable LIFT inks require a high viscosity and high shear thinning effect in order to achieve a homogeneous donor formation, followed by stable jets and subsequent reproducible printed patterns. Since ink viscosity is highly influenced by metal concentration, the metal content was raised and fine-tuned to 60% for optimum performance in the DGBE solvent of choice, as well as contributing to the printing process throughput and formation of dense printed patterns.…”

Section: Introductionmentioning

confidence: 99%

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Copper micro-electrode fabrication using laser printing and laser sintering processes for on-chip antennas on flexible integrated circuits

Koritsoglou

Theodorakos

Zacharatos

et al. 2019

Opt. Mater. Express

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Recent advances in flexible electronics have highlighted the importance of high throughput, digital additive microfabrication techniques. In this work, we demonstrate the combination of laser printing and laser sintering of a novel copper nanoparticle ink onto flexible substrates in order to produce oxide free conductive copper patterns in ambient atmospheric conditions. The printed patterns exhibit high reproducibility, very low resistivity (about 2x bulk), and negligible oxidation according to Raman spectroscopy. The process has been employed for the fabrication of an on-chip antenna on a flexible substrate for use in combination with a flexible circuit, in applications where a small form factor and simplicity of integration are required alongside ultra-low cost, e.g. consumable tagging.

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Section: Lift and Laser Sintering: Process And Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Copper micro-electrode fabrication using laser printing and laser sintering processes for on-chip antennas on flexible integrated circuits

Koritsoglou

Theodorakos

Zacharatos

et al. 2019

Opt. Mater. Express

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“…Several studies have proved the feasibility of LIFT for printing liquids with a wide range of viscosities (from 1 to 10 6 mPa s), [ 33–35 ] and suspensions containing large loading particles (up to 30 µm). [ 36–38 ] Thus, SP inks—with high viscosity (>10 Pa s) and usually loaded with large particles (a few micrometers)—can be printed using LIFT, [ 39–43 ] though not through IJP. [ 19,20 ] These rheological properties are compatible with high solid contents, and in the case of conductive inks, they can result in the fabrication of interconnects with sheet resistances as low as 50 mΩ □ −1 , [ 5,44–46 ] much lower than those resulting from IJP (around 1 Ω □ −1 ).…”

Section: Introductionmentioning

confidence: 99%

Laser‐Induced Forward Transfer: A Digital Approach for Printing Devices on Regular Paper

Sopeña

Sieiro

Fernández-Pradas

et al. 2020

Adv Materials Technologies

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Inkjet printing (IJP) is the most widespread direct‐write technique in paper electronics. However, this technique cannot be used for printing devices on untreated regular paper, since its low‐viscosity nanoinks leak through the cellulose fibers. Thus, a planarization coating is frequently used as a barrier, even though this makes substrates more expensive and less eco‐friendly. Alternatively, high solid content screen printing (SP) inks could allow printing on regular paper due to their high viscosity and large particle size; however, they cannot be printed through IJP. Another digital technique is then required: laser‐induced forward transfer (LIFT). This work aims at proving the feasibility of LIFT for printing devices on regular paper. The main transfer parameters are systematically varied to obtain uniform Ag‐SP interconnects, whose performance is improved by a multiple‐printing approach. It results in low resistances with much better performance than those typical of IJP. After optimizing the functionality of the printed lines, a proof‐of‐concept consisting of a radio‐frequency inductor is provided. The characterization of the device shows a substantially higher performance than that of the same device printed with IJP ink in similar conditions, which proves the potential of LIFT for digitally fabricating devices on regular paper.

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“…The peristaltic transport of non-Newtonian fluids in a diverging tube with various forms of near-wall waves was studied by Hariharan et al [10]. Comparison of ink exhibiting Newtonian and non-Newtonian character for laser printing was carried out by Kalaitzis et al [11]. The rheological properties of the TiO 2 /ZnO/EG nanofluid were studied by Nafchi et al [12].…”

Section: Introductionmentioning

confidence: 99%

Natural Convection of Non-Newtonian Power-Law Fluid in a Square Cavity with a Heat-Generating Element

2019

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Development of modern technology in microelectronics and power engineering necessitates the creation of effective cooling systems. This is made possible by the use of the special fins technology within the cavity or special heat transfer liquids in order to intensify the heat removal from the heat-generating elements. The present work is devoted to the mathematical modeling of thermogravitational convection of a non-Newtonian fluid in a closed square cavity with a local source of internal volumetric heat generation. The behavior of the fluid is described by the Ostwald-de Waele power law model. The defining Navier–Stokes equations written using the dimensionless stream function, vorticity and temperature are solved using the finite difference method. The effects of the Rayleigh number, power-law index, and thermal conductivity ratio on heat transfer and the flow structure are studied. The obtained results are presented in the form of isolines of the stream function and temperature, as well as the dependences of the average Nusselt number and average temperature on the governing parameters.

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Jetting dynamics of Newtonian and non-Newtonian fluids via laser-induced forward transfer: Experimental and simulation studies

Cited by 42 publications

References 32 publications

Copper micro-electrode fabrication using laser printing and laser sintering processes for on-chip antennas on flexible integrated circuits

Copper micro-electrode fabrication using laser printing and laser sintering processes for on-chip antennas on flexible integrated circuits

Laser‐Induced Forward Transfer: A Digital Approach for Printing Devices on Regular Paper

Natural Convection of Non-Newtonian Power-Law Fluid in a Square Cavity with a Heat-Generating Element

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