Droplet transportation using a pre-charging method for digital microfluidics

Title
Droplet transportation using a pre-charging method for digital microfluidics
Authors
임매순최경용최지민최양규
Issue Date
2012-03
Publisher
Microfluidics and Nanofluidics
Citation
VOL 12, NO 5-827
Abstract
A new droplet-driving scheme for digital microfluidics termed the ‘‘pre-charging of a droplet’’ is demonstrated. In this method, a droplet is initially charged by applying ‘‘pre-charging’’ voltage between the droplet and an electrode buried under dielectric layers. The droplet is then driven to the next electrode by applying ‘‘driving’’ voltage between two adjacent buried electrodes. The concept of pre-charging was proved by the polarity of the charge stored in the droplet. When the droplet is precharged with positive voltage, it is driven with negative voltage and vice versa. Therefore, the magnitudes of the pre-charging and driving voltages are identical, but only with the opposite polarity. A 2.5-lL deionized water droplet is pre-charged and driven at a minimal voltage of 12 V. The charge stored in the droplet by this pre-charging method remained for more than 2 min, and the driving actuation could be repeated more than 150 times while the droplet remained its charged state. This method suggests a new means of driving a droplet for digital microfluidics at a relatively low voltage by utilizing both the electrostatic and dielectrophoretic force in the droplet transport process with a simpler structure compared to other single-plate structured devices.
URI
http://pubs.kist.re.kr/handle/201004/71031
ISSN
1613-4982
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KIST Publication > Article
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