Journal ArticleDOI
Creating, transporting, cutting, and merging liquid droplets by electrowetting-based actuation for digital microfluidic circuits
TLDR
In this paper, the authors report the completion of four fundamental fluidic operations considered essential to build digital microfluidic circuits, which can be used for lab-on-a-chip or micro total analysis system (/spl mu/TAS): 1) creating, 2) transporting, 3) cutting, and 4) merging liquid droplets, all by electrowetting.Abstract:
Reports the completion of four fundamental fluidic operations considered essential to build digital microfluidic circuits, which can be used for lab-on-a-chip or micro total analysis system (/spl mu/TAS): 1) creating, 2) transporting, 3) cutting, and 4) merging liquid droplets, all by electrowetting, i.e., controlling the wetting property of the surface through electric potential. The surface used in this report is, more specifically, an electrode covered with dielectrics, hence, called electrowetting-on-dielectric (EWOD). All the fluidic movement is confined between two plates, which we call parallel-plate channel, rather than through closed channels or on open surfaces. While transporting and merging droplets are easily verified, we discover that there exists a design criterion for a given set of materials beyond which the droplet simply cannot be cut by EWOD mechanism. The condition for successful cutting is theoretically analyzed by examining the channel gap, the droplet size and the degree of contact angle change by electrowetting on dielectric (EWOD). A series of experiments is run and verifies the criterion.read more
Citations
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Journal ArticleDOI
Droplet transport through dielectrophoretic actuation using line electrode
TL;DR: In this article, a transverse line electrode configuration for droplet transport through dielectrophoretic actuation with potential lab-on-chip applications was explored using a lumped electromechanical model.
Journal ArticleDOI
Droplet Translation Actuated by Photoelectrowetting.
Cesar Palma,Robert D. Deegan +1 more
TL;DR: Droplet transport actuated by PEW eliminates the need for electrode arrays and the complexities entailed in their fabrication and control, and offers a new approach for designing lab-on-a-chip applications.
Proceedings ArticleDOI
A droplet routing technique for fault-tolerant digital microfluidic devices
TL;DR: This paper describes a droplet routing technique for a fault-tolerant digital microfluidic platform that features handling of many microfluidity operations simultaneously and uses on-chip sensors for diagnosis at run-time.
Journal ArticleDOI
A Numerical Study on Electrowetting Induced Droplet Detachment from Hydrophobic Surface
Ashraful Islam,Albert Y. Tong +1 more
TL;DR: In this paper, a finite volume scheme with a two-step projection method on a fixed computational domain has been used to solve the governing equations for transient microfluidic flow.
Journal ArticleDOI
A Mixed Finite Element Method for EWOD That Directly Computes the Position of the Moving Interface
Richard S. Falk,Shawn W. Walker +1 more
TL;DR: A new mixed finite element method is proposed and analyzed for simulating two-phase droplet motion in a microscale device driven by electrowetting-on-dielectric, proving well-posedness of the semidiscrete and fully discrete formulations and error estimates with minimal regularity assumptions.
References
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Book
Fundamentals of microfabrication
TL;DR: The second edition of the Fundamentals of Microfabrication as discussed by the authors provides an in-depth coverage of the science of miniaturization, its methods, and materials, from the fundamentals of lithography through bonding and packaging to quantum structures and molecular engineering.
Journal ArticleDOI
Electrowetting-based actuation of liquid droplets for microfluidic applications
TL;DR: In this article, a microactuator for rapid manipulation of discrete microdroplets is presented, which is accomplished by direct electrical control of the surface tension through two sets of opposing planar electrodes fabricated on glass.
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Micromachined Transducers Sourcebook
TL;DR: In this paper, the authors present an overview of Micromachining Techniques, Mechanical Transducers, Optical Transducers and Ionizing Radiation Transducers for Microfluidic Devices.
Journal ArticleDOI
Electrowetting-based actuation of droplets for integrated microfluidics
TL;DR: In this paper, an alternative approach to microfluidics based upon the micromanipulation of discrete droplets of aqueous electrolyte by electrowetting is reported.