Visual Feedback Based Droplet Size Regulation in Electrohydrodynamic Jet Printing

2014 ◽  
Author(s):  
Berk Altın ◽  
Lai Yu Leo Tse ◽  
Kira Barton
Keyword(s):  
Image Processing ◽  
Visual Feedback ◽  
High Speed ◽  
Electrostatic Force ◽  
Micro Manufacturing ◽  
Precise Control ◽  
Electrohydrodynamic Jet Printing ◽  
Conductive Substrate ◽  
Ink Jet ◽  
Jet Printing

Electrohydrodynamic jet (e-jet) printing is a recent micro-manufacturing technique that uses electrostatic force to draw out ink from a conductive nozzle onto a conductive substrate. While the advantages (high speed and resolution, flexibility) of e-jet printing over ink jet printing and other microfabrication methods are abundant, precise control of the process is necessary for successful commercialization of the technology. This paper shows how visual feedback through image processing may be used to regulate the volume of printed droplets for increased manufacturing precision.

A Control-Oriented Dynamical Model of Deposited Droplet Volume in Electrohydrodynamic Jet Printing

2020 ◽  
Author(s):  
Isaac A. Spiegel ◽  
Tom van de Laar ◽  
Tom Oomen ◽  
Kira Barton
Keyword(s):  
High Resolution ◽  
High Speed ◽  
System Model ◽  
Droplet Volume ◽  
Hybrid Dynamical System ◽  
Electrohydrodynamic Jet Printing ◽  
Control Schemes ◽  
Volume Measurements ◽  
Jet Printing ◽  
Definition Of

Abstract Electrohydrodynamic jet printing (e-jet printing) is a nascent additive manufacturing process most notable for extremely high resolution printing and having a vast portfolio of printable materials. These capabilities make e-jet printing promising for applications such as custom electronics and biotechnology fabrication. However, reliably fulfilling e-jet printing’s potential for high resolution requires delicate control of the volume deposited by each jet. Such control is made difficult by a lack of models that both capture the dynamics of volume deposition and are compatible with the control schemes relevant to e-jet printing. This work delivers such a model. Specifically, this work introduces a definition of “droplet volume” as a dynamically evolving variable rather than a static variable, and uses this definition along with analysis of high speed microscope videos to develop a hybrid dynamical system model of droplet volume evolution. This model is validated with experimental data, which involves the contribution of a novel technique for extracting consistent droplet volume measurements from videos.

Direct Fabrication of Highly Conductive Micro Silver Tracks Using Electrohydrodynamic Jet Printing for Sub-20 µM Micro-Manufacturing

2014 ◽  
Author(s):  
Hangtang Qin ◽  
Chuang Wei ◽  
Jingyan Dong ◽  
Yuan-Shin Lee
Keyword(s):  
Electrical Potential ◽  
Three Dimensional ◽  
Micro Manufacturing ◽  
Electrohydrodynamic Jet Printing ◽  
Biomedical Device ◽  
Direct Fabrication ◽  
Bulk Silver ◽  
Jet Printing ◽  
Alternative Current ◽  
First Time

This paper presents a direct fabrication method of highly conductive silver tracks with sub-20 μm microstructures on glass substrate by using electrohydrodynamic jet printing (EHDJP) with alternative current (AC) voltage. Traditional ink jet printing fabrication approaches are limited in the achievable resolution. EHDJP has been used in directly printing by generating a fine jet through a large electrical potential between nozzle and substrate. When charge accumulates on the ink meniscus at the nozzle, a fine jet down to nano scale can be generated. In the paper, we successfully applied EHDJP for fabrication of highly conductive silver tracks using AC voltage. It was the first time that sub-20 μm silver tracks were demonstrated and printed with resistivity about 3.16 times than bulk silver. The variables of fabrication process were investigated to achieve reliable jet printing of conductive silver tracks. The topography of printed tracks was characterized and verified in the study. The presented technique can be used for micro-manufacturing of three-dimensional microstructures and biomedical device fabrications.

The mechanism of a splash on a dry solid surface

2011 ◽  
Vol 690 ◽  
pp. 148-172 ◽  
Author(s):  
Shreyas Mandre ◽  
Michael P. Brenner
Keyword(s):  
Solid Surface ◽  
High Speed ◽  
Liquid Droplet ◽  
Contact Point ◽  
Quantitative Agreement ◽  
Gas Pressure ◽  
Liquid Viscosity ◽  
Ink Jet ◽  
Jet Printing ◽  
The Impact

AbstractFrom rain storms to ink jet printing, it is ubiquitous that a high-speed liquid droplet creates a splash when it impacts on a dry solid surface. Yet, the fluid mechanical mechanism causing this splash is unknown. About fifty years ago it was discovered that corona splashes are preceded by the ejection of a thin fluid sheet very near the vicinity of the contact point. Here we present a first-principles description of the mechanism for sheet formation, the initial stages of which occur before the droplet physically contacts the surface. We predict precisely when sheet formation occurs on a smooth surface as a function of experimental parameters, along with conditions on the roughness and other parameters for the validity of the predictions. The process of sheet formation provides a semi-quantitative framework for studying the subsequent events and the influence of liquid viscosity, gas pressure and surface roughness. The conclusions derived from this framework are in quantitative agreement with previous measurements of the splash threshold as a function of impact parameters (the size and velocity of the droplet) and in qualitative agreement with the dependence on physical properties (liquid viscosity, surface tension, ambient gas pressure, etc.) Our analysis predicts an as yet unobserved series of events within micrometres of the impact point and microseconds of the splash.

scholarly journals High-speed precise cell patterning by pulsed electrohydrodynamic jet printing

2017 ◽  
Vol 256 ◽  
pp. 012013 ◽  
Author(s):  
A V Makaev ◽  
E A Mingaliev ◽  
V R Karpov ◽  
I V Zubarev ◽  
V Ya Shur ◽  
...  
Keyword(s):  
High Speed ◽  
Cell Patterning ◽  
Electrohydrodynamic Jet Printing ◽  
Jet Printing

Nanoscale coaxial focused electrohydrodynamic jet printing

Nanoscale ◽  
2018 ◽  
Vol 10 (21) ◽  
pp. 9867-9879 ◽  
Author(s):  
Dazhi Wang ◽  
Xiaojun Zhao ◽  
Yigao Lin ◽  
Junsheng Liang ◽  
Tongqun Ren ◽  
...  
Keyword(s):  
High Speed ◽  
Cost Effective ◽  
Nanowire Arrays ◽  
Cantilever Beams ◽  
Electrohydrodynamic Jet Printing ◽  
Printing Technique ◽  
Jet Printing

A high-speed and cost-effective nanoscale printing technique was developed to fabricate aligned nanowire arrays, nano-freebeams and nano-cantilever beams.

Airflow Assisted Electrohydrodynamic Jet Printing: An Advanced Micro-Additive Manufacturing Technique

2015 ◽  
Author(s):  
Lai Yu Leo Tse ◽  
Kira Barton
Keyword(s):  
Additive Manufacturing ◽  
High Resolution ◽  
Electric Fields ◽  
Large Range ◽  
Diverse Range ◽  
Electrohydrodynamic Jet Printing ◽  
Conductive Substrate ◽  
Jet Printing ◽  
Working Principle ◽  
Manufacturing Technologies

Electrohydrodynamic jet (e-jet) printing is a growing technology for high resolution (<20μm) printing. It enjoys the advantages of other additive manufacturing technologies and is compatible with a large range of materials. E-jet applications include electronic fabrication, high-resolution prototyping, and bio-medical devices. Despite the diverse range of applications, e-jet printing dynamics are sensitive to varying standoff heights and changing electric fields. As such, conventional e-jet printing generally consists of a conductive nozzle printing onto a flat, conductive substrate. To address this limitation, this paper presents an airflow assisted e-jet printhead that is shown to greatly reduce the substrate effects while providing good printing resolution (<15μm). The working principle and design challenges are provided. Experimental demonstrations validate the performance capabilities of the modified e-jet printhead.

The Influence of the Viscosity of Edible Ink to Ink-Jet Printing Drop State

2012 ◽  
Vol 535-537 ◽  
pp. 2559-2562 ◽  
Author(s):  
Jing Mei Sun ◽  
Xian Fu Wei ◽  
Bei Qing Huang
Keyword(s):  
High Speed ◽  
Low Cost ◽  
Tail Length ◽  
High Viscosity ◽  
Rupture Time ◽  
Contact Printing ◽  
Ink Jet Printing ◽  
Ink Jet ◽  
Key Factor ◽  
Jet Printing

Inkjet Printing is a non-contact printing, and it has wide adaptability, high speed and intelligence, low cost and no pollution as well, so it is the best printing form for food and drug surface printing. Drops control technology is the key to the development of ink-jet printing technology, and viscosity is also the key factor that influences the drop state. In this article, the samples which have different viscosity are got by the way of adding different levels of resin to the ink. Drop state is observed through drops observatory, the speed, tail length and volume are measured by it in order to evaluate the influence of viscosity to ink-jet drop state. The result shows that viscosity has big influence to ink-jet drop state, if the viscosity is larger, the speed of drops is smaller. The ink with high viscosity is easier to gather into a circular drop than that with small viscosity. If the viscosity more than 13.2mPa•s, the rupture time and tail length of the drop increases along with the increase of viscosity. When the viscosity is 10.3mPa•s, its rupture time is 80s and the ink soon gather into a circular drop under the action of cohesion, its drop state is the best.

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