Effect of viscosity, electrical conductivity, and surface tension on direct-current-pulsed drop-on-demand electrohydrodynamic printing frequency

2014 ◽  
Vol 105 (21) ◽  
pp. 214102 ◽  
Author(s):  
Seongpil An ◽  
Min Wook Lee ◽  
Na Young Kim ◽  
Changmin Lee ◽  
Salem S. Al-Deyab ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Surface Tension ◽  
Direct Current ◽  
On Demand ◽  
Drop On Demand ◽  
Electrohydrodynamic Printing

Drop-on-Demand Electrohydrodynamic Printing of High Resolution Conductive Micro Patterns for MEMS Repairing

2018 ◽  
Vol 19 (6) ◽  
pp. 811-819 ◽  
Author(s):  
Young Jin Yang ◽  
Hyung Chan Kim ◽  
Memoon Sajid ◽  
Soo wan Kim ◽  
Shahid Aziz ◽  
...  
Keyword(s):  
High Resolution ◽  
On Demand ◽  
Drop On Demand ◽  
Electrohydrodynamic Printing ◽  
Micro Patterns

Fully Solution-Processed Transparent Artificial Neural Network Using Drop-On-Demand Electrohydrodynamic Printing

2019 ◽  
Vol 11 (19) ◽  
pp. 17521-17530 ◽  
Author(s):  
Jason Yong ◽  
You Liang ◽  
Yang Yu ◽  
Basem Hassan ◽  
Md Sharafat Hossain ◽  
...  
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Solution Processed ◽  
On Demand ◽  
Drop On Demand ◽  
Electrohydrodynamic Printing ◽  
Artificial Neural

scholarly journals Deformation characteristics of a single droplet driven by a piezoelectric nozzle of the drop-on-demand inkjet system

2019 ◽  
Vol 869 ◽  
pp. 634-645 ◽  
Author(s):  
Shangkun Wang ◽  
Yonghong Zhong ◽  
Haisheng Fang
Keyword(s):  
Surface Tension ◽  
Pressure Wave ◽  
Deformation Process ◽  
Deformation Characteristics ◽  
Single Droplet ◽  
Computational Simulations ◽  
Droplet Deformation ◽  
On Demand ◽  
Drop On Demand ◽  
Maximum Value

In the drop-on-demand (DOD) inkjet system, deformation process and the direct relations between the droplet motions and the liquid properties have been seldom investigated, although they are very critical for the printing accuracy. In this study, experiments and computational simulations regarding deformation of a single droplet driven by a piezoelectric nozzle have been conducted to address the deformation characteristics of droplets. It is found that the droplet deformation is influenced by the pressure wave propagation in the ink channel related to the driven parameters and reflected in the subsequent droplet motions. The deformation extent oscillates with a certain period of $T$ and a decreasing amplitude as the droplet moves downwards. The deformation extent is found strongly dependent on the capillary number ($Ca$), first ascending and then descending as the number increases. The maximum value of the deformation extent is surprisingly found to be within range of 0.068–0.082 of the $Ca$ number regardless of other factors. Furthermore, the Rayleigh’s linear relation of the oscillation frequency of the droplet to the parameter, $\sqrt{\unicode[STIX]{x1D70E}/\unicode[STIX]{x1D70C}r^{3}}$ (where $\unicode[STIX]{x1D70E}$ is the surface tension coefficient, $\unicode[STIX]{x1D70C}$ is the density and $r$ is the droplet’s radius), is updated with a smaller slope shown both by experiment and simulation.

Laser Induced Nano-Droplet Ejection for the Construction of Nano-Inkjets

2012 ◽  
Author(s):  
Yu Yang ◽  
Vijay M. Sundaram ◽  
Alok Soni ◽  
Sy-Bor Wen
Keyword(s):  
Surface Tension ◽  
Pulse Energy ◽  
Nanosecond Laser ◽  
Continuous Laser ◽  
Fluidic Channel ◽  
Robust Approach ◽  
Power Intensity ◽  
On Demand ◽  
Drop On Demand ◽  
Droplet Ejection

To achieve precise nano-droplet ejection, the existing microscale inkjet module could be scaled down to nanoscale, including both the fluidic channel and the pressure driver. While 2D/3D nanoscale fluidic channels are currently available, a nanoscale pressure driver providing high enough power intensity to overcome surface tension for nano-droplet ejection is still lacking. In this study, laser induced nanoscale confined heating with nano-nozzles are constructed and demonstrated as a simple and robust approach to achieve the required pressure driver. For the heating with continuous laser, micro spray composed with nano-droplets can be induced from the nano-nozzles. For the heating with nanosecond laser of adequate pulse energy, drop-on-demand ejection of droplets with similar diameter as the apertures of the nano-nozzle can be achieved.

Inkjet printable silver dispersions: Effect of bimodal particle-size distribution on film formation and electrical conductivity

2010 ◽  
Vol 25 (5) ◽  
pp. 821-827 ◽  
Author(s):  
Krishna Balantrapu ◽  
Meaghan McMurran ◽  
Dan V. Goia
Keyword(s):  
Electrical Conductivity ◽  
Particle Size ◽  
Size Distribution ◽  
Film Formation ◽  
Small Particles ◽  
Silver Films ◽  
On Demand ◽  
Drop On Demand ◽  
Large Particles ◽  
Effect Of Particle Size

Inks containing silver nanoparticles of 12 nm, 80 nm, and a 15%/85% mixture of the two sizes were used to evaluate the effect of particle size and size distribution on the electrical properties of sintered films. The silver layers deposited with a “drop-on-demand” inkjet printer were heated at temperatures ranging from 125 to 200 °C. The small particles formed less resistive films at 125 °C, while the larger ones provided better electrical conductivity above 150 °C. The inks containing mixed small and large particles yielded the most conductive silver films over the entire investigated temperature range. A mechanism explaining these results is proposed based on the evolution of film microstructure with temperature.

Deposition of Molten Eutectic Solder using Jet Printing Techniques

1995 ◽  
Vol 390 ◽  
Author(s):  
Michael D. Snyder ◽  
Ronald Lasky
Keyword(s):  
Surface Tension ◽  
Circuit Boards ◽  
Eutectic Solder ◽  
On Demand ◽  
Drop On Demand ◽  
Single Feature ◽  
Ink Jet ◽  
Jet Printing ◽  
Printing Techniques ◽  
Large Spherical

ABSTRACTThis paper discusses the use of Ink Jet printing techniques to dispense small (50 to 75 micrometer diameter) particles of molten eutectic solder individually at programmable dispense rates from drop on demand to several thousand per second. Alternative jet dispensing techniques are discussed. The technology could allow the selective application of programmable amounts of solder on precision circuit boards and wafer substrates, while avoiding the high cost and flexibility limits associated with hard tooling. Large solder features can be constructed by dispensing individual droplets and relying on surface tension to draw them together to form a large single feature. Alternatively, columnar features can be created by successively dispensing solder droplets at the same site, allowing time between successive droplets to avoid forming a single large spherical feature.Several potential application areas in industry are discussed along with some of the issues associated with the projected performance of the method in the accuracy and speed domains.

Relevant Influencing Factors on Droplet Characteristics for a Piezoelectrically Driven Drop-on-Demand Printhead

2014 ◽  
Author(s):  
Markus Kagerer ◽  
Arne Meeuw ◽  
Jan Berger ◽  
Dominik Rumschoettel ◽  
Tim C. Lueth ◽  
...  
Keyword(s):  
Surface Tension ◽  
Formation Process ◽  
Droplet Formation ◽  
Electrical Excitation ◽  
Fluid Mixture ◽  
Nozzle Length ◽  
On Demand ◽  
Drop On Demand ◽  
Fluid Properties

Dispensing minute amounts of fluid is used in many industries, such as in life science, bioengineering, 3D printing, or in electronics manufacturing. Each application for drop-on-demand (DoD) printheads requires different drop volumes and drop velocities. Furthermore, it is necessary to eject droplets made of fluids with different fluid properties, like viscosity, surface tension, or density. Due to this wide range of different applications and demands on printheads it is important to investigate the influence of relevant factors on the droplet formation process. Therefore, the influence of the fluid properties, the printhead geometry, and the electrical excitation form on the droplet formation process are described in this project. In detail, the influence of the surface tension as well as the viscosity of the fluid, the nozzle length and its width, and the amplitude of the applied voltage at different pulse widths on the droplet characteristics are investigated. The used printhead consists of a silicon chip, which includes the fluidic components, and of a bimorph piezoelectric actuator. The printhead is manufactured with rapid manufacturing techniques, such as laser micromachining. The advantage of this method is that the printhead is adaptable to new boundary conditions in a time- and cost-saving manner. In this project, the nozzles have a square shape with a sidelength between 50 and 100 μm and the nozzle length varies between 50 and 200 μm. A fluid mixture is provided which can be varied in its fluid properties. Therefore, the possibility for the independent adjustment of its viscosity and its surface tension is given. The mixture consists of glycerin, distilled water, and isopropanol. An analytical description for each amount of its substances enables to provide a fluid with defined properties. Three kinds of experiments are carried out in order to determine the influence of the fluid properties, the printhead geometry, and the electrical excitation on the droplet formation process. The determination of the minimum excitation voltage needed for droplet ejection and the determination of the droplet volume and its velocity. The main results are: The higher the surface tension, viscosity, and nozzle length, the higher is the minimum excitation voltage. Furthermore, the droplet velocity decreases for an increased surface tension, viscosity, and nozzle length. On the other hand, the droplet velocity increases with an enlarged amplitude of the voltage and pulse width. The droplet volume increases for an increased surface tension, nozzle width, pulse width, and amplitude of the voltage. In general, the reasons for these correlations are the interaction between the strength of the pressure pulse, friction forces, fluidic resistances, and fluid properties. Overall, the possibility to achieve microdroplets made of different fluids and with a specific velocity and volume is described. Furthermore, a fluid mixture, which can be varied in its fluid properties, is presented.

scholarly journals Jetting behavior in drop-on-demand printing: Laboratory experiments and numerical simulations

2020 ◽  
Vol 5 (4) ◽  
Author(s):  
E. Antonopoulou ◽  
O. G. Harlen ◽  
M. A. Walkley ◽  
N. Kapur
Keyword(s):  
Numerical Simulations ◽  
Laboratory Experiments ◽  
On Demand ◽  
Drop On Demand

scholarly journals Microstructural Characterization of Pure Tin Produced by the Drop-on-Demand Technique of Liquid Metal Jetting

2019 ◽  
Vol 50 (9) ◽  
pp. 4000-4005 ◽  
Author(s):  
Yaakov Idell ◽  
Nicholas Watkins ◽  
Andrew Pascall ◽  
Jason Jeffries ◽  
Kerri Blobaum
Keyword(s):  
Liquid Metal ◽  
Microstructural Characterization ◽  
On Demand ◽  
Drop On Demand

A Pneumatic Drop-on-Demand Printing System With an Extended Printable Liquid Range

2015 ◽  
Vol 24 (4) ◽  
pp. 768-770 ◽  
Author(s):  
In Ho Choi ◽  
Young Kwon Kim ◽  
Sangmin Lee ◽  
Seung Hee Lee ◽  
Joonwon Kim
Keyword(s):  
On Demand ◽  
Drop On Demand ◽  
Printing System
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