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Sensors 2015, 15(4), 7650-7657; doi:10.3390/s150407650

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
Author to whom correspondence should be addressed.
Academic Editor: Alexander Star
Received: 9 January 2015 / Revised: 6 March 2015 / Accepted: 23 March 2015 / Published: 30 March 2015
(This article belongs to the Section Biosensors)
View Full-Text   |   Download PDF [1452 KB, uploaded 30 March 2015]   |  


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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

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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