NDLI: A novel microfluidic driver via AC electrokinetics

Content Provider	Royal Society of Chemistry (RSC)
Author	Kuo, Ching-Te Liu, Cheng-Hsien
Copyright Year	2008
Abstract	A novel ac electrokinetic microfluidic driver based on alternating current electro-osmosis flow induced by asymmetrically capacitance/chemistry-modulated microelectrode arrays has been successfully developed and demonstrated. Asymmetric capacitance modulation (ACM) is made of comb electrode arrays and parts of individual electrode surfaces are modulated/deposited with a SiO2 dielectric layer. This proposed design can be utilized to shift the optimal operation frequency of maximum velocity to a higher frequency to minimize electrolytic bubble generation and enhance micropumping performance. The pumping velocity, described in this paper, is measured via the tracing of microbeads and is a function of applied potential, signal frequency, buffer concentration, and dielectric layer thickness. A maximum pumping velocity up to 290 μm s−1 in 5 mM buffer solution with the applied potential of 10 Vpp is observed in our prototype device, and the estimated maximum flow rate is up to 26.1 μl h−1. This is the first successful demonstration regarding bubble-free ac electrokinetic micropumping via such asymmetrically capacitance-modulated electrode arrays. Design, simulation, microfabrication, experimental result, and theoretical model are described in this paper to characterize and exhibit the performance of the proposed novel bubble-free ac electrokinetic microfluidic driver.
Starting Page	725
Ending Page	733
Page Count	9
File Format	HTM / HTML PDF
ISSN	14730197
Volume Number	8
Issue Number	5
Journal	Lab on a Chip
DOI	10.1039/b719968f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Soap bubble Electro-osmosis Electrode Electrokinetic phenomena Association for Computing Machinery Microfabrication Micrometre Capacitance Dielectric Buffer solution Alternating current
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Biochemistry Bioengineering Biomedical Engineering

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