Mode coupling in a hanging-fiber AFM used as a rheological probe

Mode coupling in a hanging-fiber AFM used as a rheological probe

We analyze the advantages and drawbacks of a method which measures the viscosity of liquids at microscales, using a thin glass fiber fixed on the tip of a cantilever of an ultra-low-noise Atomic Force Microscope (AFM). When the fiber is dipped into a liquid, the dissipation of the cantilever-fiber s...

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Bibliographic Details
Published in:Europhysics letters Vol. 106; no. 5; pp. 54005 - p1-54005-p6
Main Authors: Devailly, C., Laurent, J., Steinberger, A., Bellon, L., Ciliberto, S.
Format: Journal Article
Language:English
Published: Les Ulis EDP Sciences, IOP Publishing and Società Italiana di Fisica 01-06-2014
IOP Publishing
European Physical Society / EDP Sciences / Società Italiana di Fisica / IOP Publishing
Subjects:
05.40.-a
47.61.Fg
83.85.Jn
Atomic force microscopy
Condensed Matter
Coupled modes
Coupling
Density
Dynamics
Fibers
Fluid Dynamics
Glass fibers
Joining
Liquids
Noise measurement
Physics
Power spectral density
Rheological properties
Soft Condensed Matter
Spectra
Spectral sensitivity
Statistical Mechanics
Viscosity
Thermal fluctuations
AFM
Micro rheology
interferometric techniques
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Summary:We analyze the advantages and drawbacks of a method which measures the viscosity of liquids at microscales, using a thin glass fiber fixed on the tip of a cantilever of an ultra-low-noise Atomic Force Microscope (AFM). When the fiber is dipped into a liquid, the dissipation of the cantilever-fiber system, which is linked to the liquid viscosity, can be computed from the power spectral density of the thermal fluctuations of the cantilever deflection. The high sensitivity of the AFM allows us to show the existence and to develop a model of the coupling between the dynamics of the fiber and that of the cantilever. This model, which accurately fits the experimental data, gives also more insights into the dynamics of coupled microdevices in a viscous environment.
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content type line 23
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/106/54005