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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/24305

Title: Using capacitance measurements in EWOD devices to identify fluid composition and control droplet mixing
Authors: Schertzer, Michael
Ben-Mrad, Ridha
Sullivan, Pierre E
Keywords: Electrowetting on dielectric
microfluidics
capacitance
Issue Date: Mar-2010
Publisher: Elsevier
Citation: doi:10.1016/j.snb.2009.12.019
Abstract: The use of capacitance measurements to identify the composition of droplets and monitor mixing in electrowetting on dielectric devices is examined here. Measurements were repeatable at each addressable location, with standard deviations on the order of 0.1 pF and a two-point calibration allowed repeatable differentiation of water–methanol solutions as the capacitance was linear with concentration. Capacitance at addressable locations was monitored throughout the mixing of water–methanol solutions. It was shown analytically and experimentally that the dimensionless capacitance is approximately equal to the dimensionless dielectric constant for practical EWOD applications. The number of cycles required for complete mixing remained constant for periods of actuation between 400 and 1000ms and applied voltages between 90 and 110VRMS. Although minimizing actuation period and maximizing droplet velocity decreases mixing time, these parameters have little affect on the number of cycles necessary to achieve mixing in EWOD devices. This shows mixing efficiency in EWOD devices is better described by the number of cycles, not the time, required for full mixing.
URI: http://hdl.handle.net/1807/24305
ISSN: 0925-4005
Appears in Collections:Department of Mechanical and Industrial Engineering

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