A set of torsional resonators is used to characterize the linear viscoelastic behavior of complex fluids in the kilohertz range. The frequency dependence of the elastic and loss modulus of a hard sphere dispersion, electrostatically and electrosterically stabilized particles, worm-like micelles, polystyrene microgels, and polymer solutions is studied. The results are compared to theoretical predictions for these systems. The utility of the instrument for characterizing the high frequency rheology of complex fluids is demonstrated. This is especially relevant for suspensions or dilute solutions and gels, where time-temperature superposition often fails and the relaxation spectrum is inaccessible from conventional oscillatory shear rotational rheometry.
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March 2003
Research Article|
March 01 2003
Characterizing complex fluids with high frequency rheology using torsional resonators at multiple frequencies
Gerhard Fritz;
Gerhard Fritz
Polymer Research Division, BASF Aktiengesellschaft, D-67056 Ludwigshafen, Germany
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Wolfgang Pechhold;
Wolfgang Pechhold
Institut für dynamische Materialprüfung an der Universität Ulm, D-89081 Ulm, Germany
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Norbert Willenbacher;
Norbert Willenbacher
Polymer Research Division, BASF Aktiengesellschaft, D-67056 Ludwigshafen, Germany
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Norman J. Wagner
Norman J. Wagner
Center for Molecular and Engineering Thermodynamics, Department of Chemical Engineering, University of Delaware, Newark, Delaware 19716
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J. Rheol. 47, 303–319 (2003)
Article history
Received:
January 04 2002
Citation
Gerhard Fritz, Wolfgang Pechhold, Norbert Willenbacher, Norman J. Wagner; Characterizing complex fluids with high frequency rheology using torsional resonators at multiple frequencies. J. Rheol. 1 March 2003; 47 (2): 303–319. https://doi.org/10.1122/1.1538608
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