Droplet velocity measurement based on dielectric layer thickness variation using digital microfluidic devices

Zulkepli, S.N.I.S. and Hamid, N.H. and Shukla, V. (2018) Droplet velocity measurement based on dielectric layer thickness variation using digital microfluidic devices. Biosensors, 8 (2).

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Abstract

In recent years, the number of interdisciplinary research works related to the development of miniaturized systems with integrated chemical and biological analyses is increasing. Digital microfluidic biochips (DMFBs) are one kind of miniaturized systems designed for conducting inexpensive, fast, convenient and reliable biochemical assay procedures focusing on basic scientific research and medical diagnostics. The role of a dielectric layer in the digital microfluidic biochips is prominent as it helps in actuating microliter droplets based on the electrowetting-on-dielectric (EWOD) technique. The advantages of using three different material layers of dielectric such as parafilm, polytetrafluoroethylene (PTFE) and ethylene tetrafluoroethylene (ETFE) were reported in the current work. A simple fabrication process of a digital microfluidic device was performed and good results were obtained. The threshold of the actuation voltage was determined for all dielectric materials of varying thicknesses. Additionally, the OpenDrop device was tested by utilizing a single-plate system to transport microliter droplets for a bioassay operation. With the newly proposed fabrication methods, these dielectric materials showed changes in contact angle and droplet velocity when the actuation voltage was applied. The threshold actuation voltage for the dielectric layers of 10-13 μm was 190 V for the open plate DMFBs. © 2018 by the authors.

Item Type: Article
Impact Factor: cited By 0
Uncontrolled Keywords: paraffin; politef; silicon dioxide; tetrafluoroethylene, Article; bioassay; biochemical analysis; contact angle; digital microfluidic biochip; droplet velocity; electric potential; electrowetting; electrowetting on dielectric technique; hydrophobicity; microfluidic analysis; microtechnology; static electricity; ultraviolet radiation; velocity
Depositing User: Mr Ahmad Suhairi Mohamed Lazim
Date Deposited: 26 Feb 2019 02:44
Last Modified: 26 Feb 2019 02:44
URI: http://scholars.utp.edu.my/id/eprint/20925

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