In situ viscometry  by optical trapping  interferometry

C. Guzmán; Henrik Flyvbjerg; R. Köszali; C. Escoffet; L Forró; S. Jeney

doi:10.1063/1.3020713

In situ viscometry by optical trapping interferometry

C. Guzmán, Henrik Flyvbjerg, R. Köszali, C. Escoffet, L Forró, S. Jeney

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Abstract

We demonstrate quantitative in situ viscosity measurements by tracking the thermal fluctuations of an optically trapped microsphere subjected to a small oscillatory flow. The measured power spectral density of the sphere's positions displays a characteristic peak at the driving frequency of the flow, which is simply proportional to the viscosity, when measured in units of the thermal power spectral density at the same frequency. Measurements are validated on different water-glycerol mixtures, as well as in a glycerol gradient, where no a priori knowledge of the solution is used to determine the glycerol concentration.

Original language	English
Journal	Applied Physics Letters
Volume	93
Issue number	18
Pages (from-to)	184102
ISSN	0003-6951
DOIs	https://doi.org/10.1063/1.3020713
Publication status	Published - 2008

Bibliographical note

Copyright (2008) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

Keywords

FORCES
TWEEZERS
PARTICLE
VISCOSITY
TRACKING

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AU - Flyvbjerg, Henrik

AU - Köszali, R.

AU - Escoffet, C.

AU - Forró, L

AU - Jeney, S.

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AB - We demonstrate quantitative in situ viscosity measurements by tracking the thermal fluctuations of an optically trapped microsphere subjected to a small oscillatory flow. The measured power spectral density of the sphere's positions displays a characteristic peak at the driving frequency of the flow, which is simply proportional to the viscosity, when measured in units of the thermal power spectral density at the same frequency. Measurements are validated on different water-glycerol mixtures, as well as in a glycerol gradient, where no a priori knowledge of the solution is used to determine the glycerol concentration.

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KW - TRACKING

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