Simultaneous viscosity and density measurement of small volumes of liquids using a vibrating microcantilever

Amir Farokh Payam, W Trewby, Kislon Voitchovsky

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Many industrial and technological applications require precise determination of the viscosity and density of liquids. Such measurements can be time consuming and often require sampling substantial amounts of the liquid. These problems can partly be overcome with the use of microcantilevers but most existing methods depend on the specific geometry and properties of the cantilever, which renders simple, accurate measurement difficult. Here we present a new approach able to simultaneously quantify both the density and the viscosity of microliters of liquids. The method, based solely on the measurement of two characteristic frequencies of an immersed microcantilever, is completely independent of the choice of a cantilever. We derive analytical expressions for the liquid's density and viscosity and validate our approach with several simple liquids and different cantilevers. Application of our model to non-Newtonian fluids shows that the calculated viscosities are remarkably robust when compared to measurements obtained from a standard rheometer. However, the results become increasingly dependent on the cantilever geometry as the frequency-dependent nature of the liquid's viscosity becomes more significant.
LanguageEnglish
Pages1492-1498
JournalANALYST
Volume142
Issue number9
Early online date20 Mar 2017
DOIs
Publication statusPublished - 7 May 2017

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Viscosity measurement
Viscosity
Viscosity of liquids
viscosity
Density of liquids
liquid
Liquids
Geometry
Rheometers
non-Newtonian fluid
geometry
Sampling
Fluids
sampling

Cite this

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abstract = "Many industrial and technological applications require precise determination of the viscosity and density of liquids. Such measurements can be time consuming and often require sampling substantial amounts of the liquid. These problems can partly be overcome with the use of microcantilevers but most existing methods depend on the specific geometry and properties of the cantilever, which renders simple, accurate measurement difficult. Here we present a new approach able to simultaneously quantify both the density and the viscosity of microliters of liquids. The method, based solely on the measurement of two characteristic frequencies of an immersed microcantilever, is completely independent of the choice of a cantilever. We derive analytical expressions for the liquid's density and viscosity and validate our approach with several simple liquids and different cantilevers. Application of our model to non-Newtonian fluids shows that the calculated viscosities are remarkably robust when compared to measurements obtained from a standard rheometer. However, the results become increasingly dependent on the cantilever geometry as the frequency-dependent nature of the liquid's viscosity becomes more significant.",
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Simultaneous viscosity and density measurement of small volumes of liquids using a vibrating microcantilever. / Farokh Payam, Amir; Trewby, W; Voitchovsky, Kislon.

In: ANALYST, Vol. 142, No. 9, 07.05.2017, p. 1492-1498.

Research output: Contribution to journalArticle

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