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TECHNICAL PAPERS

A New Device for Measuring the Viscoelastic Properties of Hydrated Matrix Gels

[+] Author and Article Information
Jeffrey W. Parsons, Robin N. Coger

Mechanical Engineering and Engineering Science, University of North Carolina-Charlotte, 9201 University City Blvd, Charlotte, NC 28223-0001

J Biomech Eng 124(2), 145-154 (Mar 29, 2002) (10 pages) doi:10.1115/1.1448822 History: Received June 25, 2000; Revised December 10, 2001; Online March 29, 2002
Copyright © 2002 by ASME
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References

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Figures

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Schematic of the piezoelectric cantilever. As shown the cantilever consists of two piezoelectric polyvinylidenefluoride (PVDF) elements that sandwich a 33 μm thick copper foil sheet. One PVDF element serves as actuator of the cantilever, while the other serves as the sensor. The glass probe at the base of the cantilever is used to attach the PALR to the test sample.
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Schematic detail of the cantilever after its glass probe is in contact with the test sample. The output voltage (Vout) and phase shift (ϕ) of the output signal, are the measured parameters used to determine G and G.
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Photograph of the new piezoelectrically actuated linear rheometer (PALR)
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Schematic of a flat plate of area, Ap, sliding over fluid of dynamic viscosity, η. This arrangement is established for the PALR by coating the sides of the glass probe with hydrophobic wax to ensure that only the bottom surface of the probe adheres to the water-based ECM samples during testing.
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Equivalent discrete mechanical model of the PALR where kc and Cc represent the spring and damping constants, respectively, of the cantilever
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Representation of test sample of height, d, when treated as a purely elastic material subject to a shear force, F
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The base phase shift, ϕb(ω), between the input and output voltages quantified by actuating the cantilever without the test sample present. The results shown are the average of 4 independent trials.
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Original and fine-tuned phase shift, ϕc(ω), of the cantilever determined without a test sample present
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Repeatable stiffness and damping errors quantified in order to ensure the reliability of the PALR measurements
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PALR Test Results (a): Viscosities of 99% pure glycerol as measured using the new rheometer. (b): Average of three BioMatrix I tests on the new rheometer compared with Snyder’s test (1998). (c): Average of three type I collagen tests on the new rheometer compared with tests by Knapp and associates (1997).
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Temperature dependence of the cantilever’s output voltage

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