Microwave Dielectric Heating of Fluids in an Integrated Microfluidic Device

Published

October 3, 2007

Author(s)

Jayna J. Shah, Siddarth Sundaresan, Jon Geist, Darwin Reyes-Hernandez, James Booth, Rao Mulpuri, Michael Gaitan

Abstract

Rapid, selective, and uniform heating of sub-microliter size fluid volumes is vital for micro total analysis system (?gTAS) applications. In this work, we present an approach to localized and selective heating of fluids in a microfluidic network. This is accomplished with microwave dielectric heating by using a coplanar waveguide (CPW) transmission line to deliver heat to a specific region in a microchannel. An elastomeric microchannel was positioned over the CPW fabricated by photolithography on a glass substrate. S-parameter and temperature measurements were used with theoretical analysis to fully characterize the temperature rise of the fluid by microwave power absorption, and it is shown that the temperature rise of the fluid is predominantly due to microwave heating. We observed a 0.95 ?aC/mW temperature rise at 15 GHz. Our theoretical analysis confirms that classical microwave absorption theory is valid at this scale.

Citation

Journal of Micromechanics and Microengineering

Volume

17

Pub Type

Journals

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Citation

Shah, J. , Sundaresan, S. , Geist, J. , Reyes-Hernandez, D. , Booth, J. , Mulpuri, R. and Gaitan, M. (2007), Microwave Dielectric Heating of Fluids in an Integrated Microfluidic Device, Journal of Micromechanics and Microengineering, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=32635 (Accessed December 3, 2024)