scholarly journals Drop-on-demand microdroplet generation: a very stable platform for single-droplet experimentation

RSC Advances ◽  
2016 ◽  
Vol 6 (65) ◽  
pp. 60215-60222 ◽  
Author(s):  
Bartholomew S. Vaughn ◽  
Phillip J. Tracey ◽  
Adam J. Trevitt
Keyword(s):  
Fluorescence Spectroscopy ◽  
Single Droplet ◽  
Enhanced Fluorescence ◽  
On Demand ◽  
Drop On Demand

This paper reports the performance of drop-on-demand piezo-activated microdroplet generation, investigated using microdroplet cavity enhanced fluorescence spectroscopy.

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.

Push-Mode Printhead Using Magnetic Linear Actuator

2014 ◽  
Vol 931-932 ◽  
pp. 1280-1284
Author(s):  
Mana Saedan ◽  
Manatpong Mangkrai
Keyword(s):  
Pressure Wave ◽  
Drop Size ◽  
Piezo Actuator ◽  
Manufacturing Processes ◽  
Linear Actuator ◽  
Linear Motion ◽  
Single Droplet ◽  
On Demand ◽  
Drop On Demand ◽  
Wide Range

A magnetic linear actuator drop-on-demand printhead with interchangeable components is designed and fabricated. The manufacturing processes of all parts are carried out with simple techniques. A droplet generation relies on a linear motion from a piston inside a printhead chamber that causes a pressure wave to push an ink out from a nozzle-aperture. The motion is actuated by a voice coil liked actuator. The voltage applied across the actuator is significantly lower than the piezo actuator. The interchangeable components enable rapid configuration of a printhead to suit wide range of ink-materials. The prototype of our printhead was tested with inks prepared from glycerin-water solutions. The operability of the printhead was evaluated at actuated time ranging from 2 100 milliseconds. Our printhead was able to jet a single droplet of ink with viscosity up to 35 mPa.s. The drop size is comparable to other types of printheads.

Drop-by-drop Polymer Deposition by Acoustic Picoliter Droplet Generators for Applications in Semiconductor Industry and Biotechnology

2006 ◽  
Vol 954 ◽  
Author(s):  
Grace C. Lee ◽  
Jeremiah R Cohen ◽  
Utkan Demirci
Keyword(s):  
Silicon Wafer ◽  
Semiconductor Industry ◽  
Wafer Surface ◽  
Single Droplet ◽  
On Demand ◽  
Drop On Demand ◽  
Silicon Wafer Surface ◽  
Polymer Deposition ◽  
Picoliter Droplet ◽  
Single Droplets

ABSTRACTPhotoresist droplets are ejected onto a wafer surface by an acoustic two dimensional micromachined ejector array. The spread of single droplets on a silicon wafer surface at varying droplet speeds is studied. Series of photoresist droplets are printed periodically drop-on-demand on a silicon wafer surface and profiles of a single droplet and two droplets overlapping with varying distances of 25 μm and 1 μm on a silicon wafer are demonstrated. Moreover, 3.4 μm thick spinless full coverage of a 4 inch wafer with photoresist is demonstrated which indicates a potential for coating wafers in less than a few seconds.

Dominant factors to produce single droplet per cycle using drop-on-demand technology driven by pulse electromagnetic force

Vacuum ◽  
2018 ◽  
Vol 156 ◽  
pp. 128-134 ◽  
Author(s):  
Tongju Wang ◽  
Jian Lin ◽  
Yongping Lei ◽  
Xingye Guo ◽  
Hanguang Fu ◽  
...  
Keyword(s):  
Electromagnetic Force ◽  
Single Droplet ◽  
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

Formulation of a ceramic ink for a wide-array drop-on-demand ink-jet printer

2003 ◽  
Vol 29 (8) ◽  
pp. 887-892 ◽  
Author(s):  
X. Zhao ◽  
J.R.G. Evans ◽  
M.J. Edirisinghe ◽  
J.H. Song
Keyword(s):  
On Demand ◽  
Drop On Demand ◽  
Ink Jet

scholarly journals Experimental and numerical investigations regarding laser drop on demand jetting of Cu alloys

2017 ◽  
Vol 11 (3) ◽  
pp. 275-284 ◽  
Author(s):  
Stefan Stein ◽  
Michael Dobler ◽  
Tim Radel ◽  
Markus Strauß ◽  
Hannes Breitschwerdt ◽  
...  
Keyword(s):  
Numerical Investigations ◽  
On Demand ◽  
Drop On Demand ◽  
Cu Alloys
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