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.

High-resolution additive direct writing of metal micro/nanostructures by electrohydrodynamic jet printing

2021 ◽  
Vol 543 ◽  
pp. 148800
Author(s):  
Wuhao Zou ◽  
Haibo Yu ◽  
Peilin Zhou ◽  
Ya Zhong ◽  
Yuechao Wang ◽  
...  
Keyword(s):  
High Resolution ◽  
Direct Writing ◽  
Electrohydrodynamic Jet Printing ◽  
Jet Printing

scholarly journals Tip-assisted electrohydrodynamic jet printing for high-resolution microdroplet deposition

2019 ◽  
Vol 166 ◽  
pp. 107609 ◽  
Author(s):  
Wuhao Zou ◽  
Haibo Yu ◽  
Peilin Zhou ◽  
Lianqing Liu
Keyword(s):  
High Resolution ◽  
Electrohydrodynamic Jet Printing ◽  
Jet Printing

Mechanisms, Capabilities, and Applications of High-Resolution Electrohydrodynamic Jet Printing

Small ◽  
2015 ◽  
Vol 11 (34) ◽  
pp. 4237-4266 ◽  
Author(s):  
M. Serdar Onses ◽  
Erick Sutanto ◽  
Placid M. Ferreira ◽  
Andrew G. Alleyne ◽  
John A. Rogers
Keyword(s):  
High Resolution ◽  
Electrohydrodynamic Jet Printing ◽  
Jet Printing

A Model of Liquid-Drop Spreading for Electrohydrodynamic Jet Printing

2015 ◽  
Author(s):  
Christopher P. Pannier ◽  
Kira Barton ◽  
David Hoelzle ◽  
Zhi Wang
Keyword(s):  
High Resolution ◽  
Viscous Friction ◽  
Length Scale ◽  
Droplet Spreading ◽  
Loop Control ◽  
Electrohydrodynamic Jet Printing ◽  
Viscous Losses ◽  
Jet Printing ◽  
Base Radius ◽  
Small Disturbances

Electrohydrodynamic jet (E-jet) printing is a recent technique for high resolution additive micromanufacturing. With high resolution comes sensitivity to small disturbances, which has kept this technique from reaching its industrial potential. Closed loop control of E-jet printing can overcome these disturbances, but it requires an improved understanding of ink droplet spreading on the substrate and a physical model to predict printed feature locations and geometries from process inputs and disturbances. This manuscript examines a model of ink droplet spreading that uses assumptions that are important to the e-jet process. Our model leverages previous energy balance models that were derived for larger length scale droplets. At the smaller length scale, we find that viscous losses are a significant portion of the energy budget and must be accounted for; this is in contrast to models at length scales two orders of magnitude larger. Our model predicts the droplet height, base radius and contact angle in time from an initial volume and E-jet printing control parameters. The model is validated with published droplet spreading data and new measurements of E-jet printed droplets of diameter 8 μm. The viscous friction calculated in the new model is found to be significant compared to surface energy.

Development and Modeling of Melt Electrohydrodynamic-Jet Printing of Phase-Change Inks for High-Resolution Additive Manufacturing

2014 ◽  
Vol 136 (6) ◽  
Author(s):  
Chuang Wei ◽  
Jingyan Dong
Keyword(s):  
Surface Tension ◽  
Additive Manufacturing ◽  
High Resolution ◽  
Phase Change ◽  
Electrostatic Force ◽  
Droplet Diameter ◽  
Scaling Law ◽  
Process Conditions ◽  
Drop On Demand ◽  
Jet Printing

This paper presents the development and modeling a high-resolution electrohydrodynamic-jet (EHD-jet) printing process using phase-change ink (i.e., wax), which is capable of producing sub-10 μm footprints (sub-10 fL in volume) for super-resolution additive manufacturing. In this study, we successfully apply EHD-jet printing for phase-change ink (wax), which is widely used as modeling and supporting material for additive manufacturing, to achieve micron-scale features. The resolution for single droplet on substrate is around 5 μm with the thickness in the range of 1–2 μm, which provides great potential in both high-resolution 3D printing and 2D drop-on-demand microfabrication. The droplet formation in EHD printing is modeled by finite element analysis (FEA). Two important forces in EHD printing, electrostatic force and surface tension force, are modeled separately by FEA. The droplet size is obtained by balancing the electrostatic force and surface tension of the pending droplets around meniscus apex. Furthermore, to predict the droplet dimension at different process conditions, a dimensionless scaling law is identified to describe the relationship between dimensionless droplet diameter and modified nondimensional electrical bond number. Finally, the droplets in-flight velocity and impact characteristics (e.g., Reynolds number and Weber number) are modeled using the results from FEA analysis.

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.

High-resolution electrohydrodynamic jet printing of small-molecule organic light-emitting diodes

Nanoscale ◽  
2015 ◽  
Vol 7 (32) ◽  
pp. 13410-13415 ◽  
Author(s):  
Kukjoo Kim ◽  
Gyeomuk Kim ◽  
Bo Ram Lee ◽  
Sangyoon Ji ◽  
So-Yun Kim ◽  
...  
Keyword(s):  
High Resolution ◽  
Small Molecule ◽  
Light Emitting Diodes ◽  
Light Emitting Diode ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
Electrohydrodynamic Jet Printing ◽  
Jet Printing

An electrohydrodynamic jet (e-jet) printed high-resolution (pixel width of 5 μm) small-molecule organic light-emitting diode (OLED) is demonstrated.

scholarly journals High-Resolution Patterns of Quantum Dots Formed by Electrohydrodynamic Jet Printing for Light-Emitting Diodes

Nano Letters ◽  
2015 ◽  
Vol 15 (2) ◽  
pp. 969-973 ◽  
Author(s):  
Bong Hoon Kim ◽  
M. Serdar Onses ◽  
Jong Bin Lim ◽  
Sooji Nam ◽  
Nuri Oh ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Resolution ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Electrohydrodynamic Jet Printing ◽  
Jet Printing

Printing: Mechanisms, Capabilities, and Applications of High-Resolution Electrohydrodynamic Jet Printing (Small 34/2015)

Small ◽  
2015 ◽  
Vol 11 (34) ◽  
pp. 4412-4412 ◽  
Author(s):  
M. Serdar Onses ◽  
Erick Sutanto ◽  
Placid M. Ferreira ◽  
Andrew G. Alleyne ◽  
John A. Rogers
Keyword(s):  
High Resolution ◽  
Electrohydrodynamic Jet Printing ◽  
Jet Printing
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