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    Rheology of fluids measured by correlation force spectroscopy

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    Downloads: 379
    Date
    2012-04-01
    Author
    Radiom, Milad
    Robbins, Brian A.
    Honig, Christopher D. F.
    Walz, John Y.
    Paul, Mark R.
    Ducker, William A.
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    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. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4704085]
    URI
    http://hdl.handle.net/10919/25132
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    • Scholarly Works, Department of Mechanical Engineering [389]
    • Scholarly Works, Department of Chemical Engineering [129]

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