Unsteady rheometry: can we characterize weak gels with a controlled stress rheometer? |
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Authors: | Christophe Baravian Ghania Benbelkacem François Caton |
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Institution: | (1) LEMTA CNRS UMR 7563 2, University of Nancy, Avenue de la Foret de Haye, BP, 160 54504 Vandoeuvre lès Nancy Cedex, France |
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Abstract: | This paper is concerned with the influence of apparatus inertia effects in controlled stress rheometry. As evidenced on creep
experiments, the coexistence of apparatus inertia and viscoelasticity leads to a coupling frequency. For weak gels, this coupling
frequency is typically between 1 and 100 Hz. Therefore, frequency sweeps around and above this coupling frequency also corresponds
to an effective shear stress sweep evolution due to a non-trivial resonant effect. In other words, frequency sweep experiments
are not made at constant shear stress. The detailed modelling and analysis of this inertia effect on a typical weak gel shows
a clear and fundamental limitation for its characterization using a controlled stress rheometer. Also, alternative approaches
to standard rheometer software analysis are proposed to take this coupling effect into account.
This paper was presented at the 3rd Annual Rheology Conference, AERC 2006, April 27-29, 2006, Crete, Greece. |
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Keywords: | Unsteady rheometry Weak gels Control stress rheometer Inertia effects |
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