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
Collective behavior of evaporating droplets on superhydrophobic surfaces
TL;DR: In this paper, the evaporation dynamics of multiple water droplets deposited in ordered arrays or randomly distributed (sprayed) on superhydrophobic substrates (SHP) and smooth silicon wafers (SW).
Proceedings ArticleDOI
Femtoliter micro-injector using digital microfluidic control
TL;DR: In this paper, a femtoliter scale microinjector is proposed, where the actuator is located outside the micropipette and may have macro scale dimensions, moving in such a manner that its acceleration changes.
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Droplet three-dimension manipulation in parallel liquid-infused membrane plates configuration
TL;DR: In this paper, the authors demonstrated the 3D manipulation of droplets between a pair of parallel liquid-infused membrane plates with patterned electrodes by programmably controlling electrical direct current signals.
Journal ArticleDOI
Three-Dimensional Numerical Simulation of Deformation of a Single Drop under Uniform Electric Field
M. Akbari,Saeed Mortazavi +1 more
TL;DR: In this article, the deformation of a drop suspended in another immiscible fluid that is influenced by an external uniform electric field is investigated through fully 3D numerical simulations, and the results show a good agreement with theoretical and experimental results in the literature.
Mechanical behavior of micro-drops in EWOD systems: drop extraction, division, motion and constraining
TL;DR: In this article, a numerical approach based on surface energy minimization is used to better understand the physical phenomena and to improve the topological design of an electrowetting on dielectric (EWOD) microchip.
References
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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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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.