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Title

Highly sensitive measurement of liquid density in air using suspended microcapillary resonators

AuthorsMalvar, Óscar ; Ramos Vega, Daniel ; Domínguez, Carmen M.; Kosaka, Priscila M. ; Tamayo de Miguel, Francisco Javier ; Calleja, Montserrat
KeywordsMicromechanical sensors
Rheology
Suspended microchannel resonators
Microcapillaries
Issue Date30-Mar-2015
PublisherMultidisciplinary Digital Publishing Institute
CitationSensors 15(4): 7650-7657 (2015)
Abstract© 2015 by the authors; licensee MDPI, Basel, Switzerland. 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.
Publisher version (URL)http://dx.doi.org/10.3390/s150407650
URIhttp://hdl.handle.net/10261/123430
DOI10.3390/s150407650
Identifiersissn: 1424-8220
Appears in Collections:(IMN-CNM) Artículos
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