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Highly Sensitive Measurement of Liquid Density in Air Using Suspended Microcapillary Resonators

Institute of Microelectronics of Madrid (IMM-CSIC), Isaac Newton 8 (PTM), Tres Cantos, 28760 Madrid, Spain
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Academic Editor: Alexander Star
Sensors 2015, 15(4), 7650-7657; https://doi.org/10.3390/s150407650
Received: 9 January 2015 / Revised: 6 March 2015 / Accepted: 23 March 2015 / Published: 30 March 2015
(This article belongs to the Section Biosensors)
We report the use of commercially available glass microcapillaries as micromechanical resonators for real-time monitoring of the mass density of a liquid that flows through the capillary. The vibration of a suspended region of the microcapillary is optically detected by measuring the forward scattering of a laser beam. The resonance frequency of the liquid filled microcapillary is measured for liquid binary mixtures of ethanol in water, glycerol in water and Triton in ethanol. The method achieves a detection limit in an air environment of 50 µg/mL that is only five times higher than that obtained with state-of-the-art suspended microchannel resonators encapsulated in vacuum. The method opens the door to novel advances for miniaturized total analysis systems based on microcapillaries with the add-on of mechanical transduction for sensing the rheological properties of the analyzed fluids without the need for vacuum encapsulation of the resonators. View Full-Text
Keywords: micromechanical sensors; microcapillaries; suspended microchannel resonators; rheology micromechanical sensors; microcapillaries; suspended microchannel resonators; rheology
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Malvar, O.; Ramos, D.; Martínez, C.; Kosaka, P.; Tamayo, J.; Calleja, M. Highly Sensitive Measurement of Liquid Density in Air Using Suspended Microcapillary Resonators. Sensors 2015, 15, 7650-7657.

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