Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7150004 | Sensors and Actuators B: Chemical | 2012 | 9 Pages |
Abstract
A device for analysing the chemical composition of single- and multi-phase solvent flows using microfluidic dielectric spectroscopy is demonstrated in this work. An open-circuited, half-wavelength, coaxial resonator operating at microwave frequencies (i.e. harmonics of 600Â MHz) was embedded in a compression-sealed polytetrafluoroethylene microfluidic chip for in situ characterization of solvent-solvent and solute-solvent mixtures of varying concentration, and an aqueous-organic segmented flow. Results are shown for a solvent mixture of acetonitrile in toluene as a test system, exhibiting a sensitivity limit of 400Â nM. In addition to being highly sensitive, the measurement system is fast, robust and non-invasive, and can be readily miniaturized.
Related Topics
Physical Sciences and Engineering
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Authors
David J. Rowe, Adrian Porch, David A. Barrow, Christopher J. Allender,