Rheology of fluids measured by correlation force spectroscopy

The Review of Scientific Instruments
Milad RadiomWilliam A Ducker

Abstract

We describe a method, correlation force spectrometry (CFS), which characterizes fluids through measurement of the correlations between the thermally stimulated vibrations of two closely spaced micrometer-scale cantilevers in fluid. We discuss a major application: measurement of the rheological properties of fluids at high frequency and high spatial resolution. Use of CFS as a rheometer is validated by comparison between experimental data and finite element modeling of the deterministic ring-down of cantilevers using the known viscosity of fluids. The data can also be accurately fitted using a harmonic oscillator model, which can be used for rapid rheometric measurements after calibration. The method is non-invasive, uses a very small amount of fluid, and has no actively moving parts. It can also be used to analyze the rheology of complex fluids. We use CFS to show that (non-Newtonian) aqueous polyethylene oxide solution can be modeled approximately by incorporating an elastic spring between the cantilevers.

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Citations

Jun 2, 2016·Reports on Progress in Physics·Thomas Andrew Waigh
May 23, 2014·Journal of Physics. Condensed Matter : an Institute of Physics Journal·A M Puertas, T Voigtmann
May 14, 2016·Nanotechnology·Milad RadiomWilliam A Ducker
Nov 16, 2013·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·M R PaulM C Cross

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Methods Mentioned

BETA
atomic force microscopy
rheology
AFM
chip
rheometry
light microscopy
force measurements

Software Mentioned

Bigg
vspace
ACE
+ Solver

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