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Micromachines 2016, 7(4), 71; doi:10.3390/mi7040071

Droplet Velocity in an Electrowetting on Dielectric Digital Microfluidic Device

1
Department of Mechanical and Aerospace Engineering, The University of Texas at Arlington, Arlington, TX 76019, USA
2
Department of Mechanical Engineering, The University of Texas at Dallas, Richardson, TX 75080, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Andrew deMello
Received: 23 February 2016 / Revised: 11 April 2016 / Accepted: 14 April 2016 / Published: 20 April 2016
(This article belongs to the Special Issue Droplet Microfluidics: Techniques and Technologies, Volume II)
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Abstract

In many electrowetting on dielectric (EWOD) based microfluidics devices, droplet actuation speed is a crucial performance-controlling parameter. Our present study aims to characterize and study droplet speed in a typical EWOD device. First, a practical droplet speed measurement method has been methodically demonstrated and some related velocity terms have been introduced. Next, influence of electrode shape on droplet speed has been studied and a new design to enhance droplet speed has been proposed and experimentally demonstrated. Instead of using square shaped electrodes, rectangular electrodes with smaller widths are used to actuate droplets. Additionally, different schemes of activating electrodes are studied and compared for the same applied voltage. The experiments show that a particular scheme of activating the array of rectangular electrodes enhances the droplet speed up to 100% in comparison to the droplet speed in a conventional device with square shaped electrodes. View Full-Text
Keywords: electrowetting on dielectric (EWOD); digital microfluidics; droplet speed; switching time; velocity measurement; slender electrodes electrowetting on dielectric (EWOD); digital microfluidics; droplet speed; switching time; velocity measurement; slender electrodes
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Nahar, M.M.; Nikapitiya, J.B.; You, S.M.; Moon, H. Droplet Velocity in an Electrowetting on Dielectric Digital Microfluidic Device. Micromachines 2016, 7, 71.

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