Journal ArticleDOI
Low voltage electrowetting-on-dielectric
TLDR
In this paper, the authors discussed and experimentally verified how to lower the operating voltage that drives liquid droplets by the principle of electrowetting on dielectric (EWOD).Abstract:
This article discusses and experimentally verifies how to lower the operating voltage that drives liquid droplets by the principle of electrowetting on dielectric (EWOD). A significant contact angle change (120°→80°) is desired to reliably pump the droplet in microchannels for applications such as lab-on-a-chip or micrototal analysis systems. Typically, much higher voltages (>100 V) are used to change the wettability of an electrolyte droplet on a dielectric layer compared with a conductive layer. The required voltage can be reduced by increasing the dielectric constant and decreasing the thickness of the dielectric layer, thus increasing the capacitance of the insulating layer. This dependence of applied voltage on dielectric thickness is confirmed through EWOD experiments for three different dielectric materials of varying thickness: Amorphous fluoropolymer (Teflon® AF, Dupont), silicon dioxide (SiO2) and parylene. The dependence on the dielectric constant is confirmed with two different dielectric mate...read more
Citations
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Journal ArticleDOI
Microfluidics: Fluid physics at the nanoliter scale
Todd M. Squires,Stephen R. Quake +1 more
TL;DR: A review of the physics of small volumes (nanoliters) of fluids is presented, as parametrized by a series of dimensionless numbers expressing the relative importance of various physical phenomena as mentioned in this paper.
Journal ArticleDOI
Electrowetting: from basics to applications
TL;DR: In this paper, the authors compare the various approaches used to derive the basic electrowetting equation, which has been shown to be very reliable as long as the applied voltage is not too high.
Journal ArticleDOI
Reactions in Droplets in Microfluidic Channels
TL;DR: Fundamental and applied research in chemistry and biology benefits from opportunities provided by droplet-based microfluidic systems, which enable the miniaturization of reactions by compartmentalizing reactions in droplets of femoliter to microliter volumes.
Journal ArticleDOI
Creating, transporting, cutting, and merging liquid droplets by electrowetting-based actuation for digital microfluidic circuits
TL;DR: 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.
Journal ArticleDOI
Video-speed electronic paper based on electrowetting
TL;DR: It is shown that electrowetting can also be used to form the basis of a reflective display that is significantly faster than electrophoretic displays, so that video content can be displayed.
References
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Book
Physical chemistry of surfaces
TL;DR: In this paper, the authors discuss the nature and properties of liquid interfaces, including the formation of a new phase, nucleation and crystal growth, and the contact angle of surfaces of solids.
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.
Journal ArticleDOI
Reversible electrowetting and trapping of charge : model and experiments
Hjj Verheijen,Mwj Menno Prins +1 more
TL;DR: In this paper, the authors derive a model for voltage-induced wetting, so-called electrowetting, from the principle of virtual displacement, including the possibility that charge is trapped in or on the wetted su...
Journal ArticleDOI
Limiting phenomena for the spreading of water on polymer films by electrowetting
M. Vallet,M. Vallade,Bruno Berge +2 more
TL;DR: In this paper, the authors present an analysis of the drop contour line stability, involving competition between electrostatic and capillary forces, which is compatible with observations, and explain how air ionization suppresses the driving force for electrowetting and induces the formation of an hydrophillic ring around the drop.
Journal ArticleDOI
Thermocapillary Pumping of Discrete Drops in Microfabricated Analysis Devices
TL;DR: The thermocapillary pumping TCP (TCP) as discussed by the authors is a non-mechanical pumping mechanism for dropping nanoliter and picoliter-sized drops of liquid within microfabricated flow channels.