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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Fundamentals and Applications of Electrowetting: A Critical Review
Ya-Pu Zhao,Ying Wang +1 more
TL;DR: In this article, a comprehensive review of electrowetting on dielectric (EWOD) is presented, and experiments, theoretical modeling and numerical simulations are covered, and some representative practical applications are then presented.
Journal ArticleDOI
Interfacing of surfaces with gallium-based liquid metals – approaches for mitigation and augmentation of liquid metal adhesion on surfaces
Journal ArticleDOI
Directed Drop Transport Rectified from Orthogonal Vibrations via a Flat Wetting Barrier Ratchet
TL;DR: The wetting barrier ratchet is introduced, a digital microfluidic technology for directed drop transport in an open air environment that capitalizes on the asymmetric contact angle hysteresis induced by the curved features to drive transport.
Journal ArticleDOI
Numerical investigation of electrowetting-based droplet splitting in closed digital microfluidic system: Dynamics, mode, and satellite droplet
Yin Guan,Baiyun Li,Lu Xing +2 more
TL;DR: In this paper, the splitting of a microdroplet in a closed electrowetting-based digital microfluidic system has been studied via a numerical model, where the governing equations for the fluid flow are solved by a finite volume formulation with a two-step projection method on a fixed computational domain.
Journal ArticleDOI
Electrowetting on dielectric-actuation of microdroplets of aqueous bismuth telluride nanoparticle suspensions
TL;DR: In this paper, the actuation of droplets of nanofluid by electrowetting on dielectric (EWOD) effect was reported, and it was shown that ion generation due to capping-agent desorption is a key factor determining the EWOD effect in the bismuth telluride nanophotonics along with the nanoparticle contribution to charge transport.
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.