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Micromachines 2016, 7(12), 235; doi:10.3390/mi7120235

Electrokinetic Phenomena in Pencil Lead-Based Microfluidics

Department of Mechanical & Aerospace Engineering, Old Dominion University, Norfolk, VA 23529, USA
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Author to whom correspondence should be addressed.
Academic Editors: Xiangchun Xuan and Nam-Trung Nguyen
Received: 2 October 2016 / Revised: 9 December 2016 / Accepted: 12 December 2016 / Published: 15 December 2016
(This article belongs to the Special Issue Micro/Nano-Chip Electrokinetics)
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Abstract

Fabrication of microchannels and associated electrodes to generate electrokinetic phenomena often involves costly materials and considerable effort. In this study, we used graphite pencil-leads as low cost, disposable 3D electrodes to investigate various electrokinetic phenomena in straight cylindrical microchannels, which were themselves fabricated by using a graphite rod as the microchannel mold. Individual pencil-leads were employed as the micro-electrodes arranged along the side walls of the microchannel. Efficient electrokinetic phenomena provided by the 3D electrodes, including alternating current electroosmosis (ACEO), induced-charge electroosmosis (ICEO), and dielectrophoresis (DEP), were demonstrated by the introduced pencil-lead based microfluidic devices. The electrokinetic phenomena were characterized by micro-particle image velocimetry (micro-PIV) measurements and microscopy imaging. Highly efficient electrokinetic phenomena using 3D pencil-lead electrodes showed the affordability and ease of this technique to fabricate microfluidic devices embedded with electrodes for electrokinetic fluid and particle manipulations. View Full-Text
Keywords: alternating current electroosmosis (ACEO); induced-charge electroosmosis (ICEO); dielectrophoresis (DEP); 3D electrode alternating current electroosmosis (ACEO); induced-charge electroosmosis (ICEO); dielectrophoresis (DEP); 3D electrode
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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

Bashirzadeh, Y.; Maruthamuthu, V.; Qian, S. Electrokinetic Phenomena in Pencil Lead-Based Microfluidics. Micromachines 2016, 7, 235.

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