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Microfluidic devices on glass for liquid mixtures concentration with coupled THz sensor This publication appears in: Journal of Integrated Circuits and Systems Authors: S. Moraes Da Silva Junior, J. Stiens, S. Moshkalev, J. Swart, R. Lacerda de Orio, V. Matvejev, Y. Zhang, W. Vandermeiren and C. De Tandt Volume: 13 Issue: 2 Pages: 1-5 Publication Date: Aug. 2018
Abstract: This paper reports on the performance of a sub-THz liquid sensor tool coupled to a microfluidic platform. Non-invasive, non-destructive and on-line measurements are demonstrated for the determination of ethanol concentration and for controlling via micromixer device. We have developed a label-free chemical sensing methodology coupling a sub-terahertz sensor technology in microfluidic devices fabricated on glass and polydimethylsiloxane. The concept of sensor in micromixer applications operating at 60 GHz for known etha-nol concentration ranging 0% to 100%, with a corresponding dynamic range of 2.79dB. The sensor allowed establishing the correlation between the mass flow rate and the ethanol concen-tration in the microfluidic system, where two-stream lines form the mixture in laminar flows, with Reynolds number < 13.54 and Peclet number > 25700. We demonstrated on-line sensing and linear control of ethanol concentration on demand with a small variation of 0.32% (v/v) between measured and required ethanol concentration.
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