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Micromachines 2017, 8(3), 65; doi:10.3390/mi8030065

Integrated Optofluidic Chip for Low-Volume Fluid Viscosity Measurement

1
Department of Electrical, Computer, and Biomedical Engineering, Università di Pavia, Via Ferrata 5A, 27100 Pavia, Italy
2
Department of Biomedical Science and Translational Medicine, Università di Milano, Via F.lli Cervi 91, 20090 Segrate, Italy
3
Institute of Photonics and Nanotechnology, CNR & Department of Physics, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
*
Author to whom correspondence should be addressed.
Academic Editors: Wei Wang, Chia-Hung Chen and Zhigang Wu
Received: 22 December 2016 / Revised: 10 February 2017 / Accepted: 15 February 2017 / Published: 23 February 2017
(This article belongs to the Special Issue Optofluidics 2016)
View Full-Text   |   Download PDF [10462 KB, uploaded 24 February 2017]   |  

Abstract

In the present work, an integrated optofluidic chip for fluid viscosity measurements in the range from 1 mPa·s to 100 mPa·s is proposed. The device allows the use of small sample volumes (<1 µL) and the measurement of viscosity as a function of temperature. Thanks to the precise control of the force exerted on dielectric spheres by optical beams, the viscosity of fluids is assessed by comparing the experimentally observed movement of dielectric beads produced by the optical forces with that expected by numerical calculations. The chip and the developed technique are validated by analyzing several fluids, such as Milli-Q water, ethanol and water–glycerol mixtures. The results show a good agreement between the experimental values and those reported in the literature. The extremely reduced volume of the sample required and the high flexibility of this technique make it a good candidate for measuring a wide range of viscosity values as well as for the analysis of nonlinear viscosity in complex fluids. View Full-Text
Keywords: optofluidics; viscosity; microfluidics; optical forces; optical shooting optofluidics; viscosity; microfluidics; optical forces; optical shooting
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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

Yang, T.; Nava, G.; Vitali, V.; Bragheri, F.; Osellame, R.; Bellini, T.; Cristiani, I.; Minzioni, P. Integrated Optofluidic Chip for Low-Volume Fluid Viscosity Measurement. Micromachines 2017, 8, 65.

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