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Measurement of dynamic properties of small volumes of fluid using MEMS

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<mark>Journal publication date</mark>28/03/2008
<mark>Journal</mark>Sensors and Actuators B: Chemical
Issue number2
Volume130
Number of pages6
Pages (from-to)701-706
Publication StatusPublished
<mark>Original language</mark>English

Abstract

A model based on the response of a micro-rheometer which permits the measurement of the linear viscoelastic properties of small volumes of a fluid is described. The configuration involves a liquid being contained within a capillary bridge between two flat smooth parallel platens that are actuated sinusoidally using a compliant MEMS device. Approximate closed-form equations are derived to analyse the data taking account of both the capillary forces and those arising from viscoelastic flow. The approximate theory is compared to a full numerical simulation of the response of the MEMS rheometer and the validity is discussed.