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Fluid viscosity determination by means of uncalibrated atomic force microscopy cantilevers

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5 Author(s)
Papi, Massimiliano ; Istituto di Fisica, Universitá Cattolica S. Cuore, Largo Francesco Vito, 1 I-00168, Roma, Italy ; Arcovito, Giuseppe ; De Spirito, Marco ; Vassalli, Massimo
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In this letter it has been proved that the vibrating resonance frequency of an atomic force microscope cantilever is strictly characterized by its thickness (α), while its width/thickness ratio (β) appears to be a less sensitive parameter that can be approximated to a constant. We therefore propose a data analysis method that, by accounting for a constant β, allows for the determination of the value of α and consequently to calculate η. This method of monitoring viscosity has the advantage of requiring short measurement times on very small sample volumes, thereby avoiding laborious, time-consuming cantilever calibration.

Published in:

Applied Physics Letters  (Volume:88 ,  Issue: 19 )

Date of Publication:

May 2006

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