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Influence of medium viscosity and adsorbed polymer on the reversible shear thickening transition in concentrated colloidal dispersions

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Abstract

The influence of medium viscosity on the onset of shear thickening of silica dispersions is investigated with two different methods. In the first method, the sample temperature is varied over a narrow range for two different suspensions. For the first suspension, the stress at the onset of shear thickening, or the critical stress, was found to be independent of sample viscosity, and the shear viscosity scaled with Peclet number, as expected. The critical stress for the second suspension was not independent of sample viscosity, and the Peclet number scaling was only moderately successful. The differences were attributed to changes in particle interactions with temperature. In the second method, the molecular weight of an oligomeric silicone oil medium is varied. In principle, this method should maintain constant chemical interactions as medium viscosity varies; however the polymer is found to adsorb onto the silica surface and delay shear thickening to higher stresses with increasing molecular weight. The critical stress for the highest molecular weight systems, which is highly dependent on particle loading, overlays with an effective volume fraction based on the hydrodynamic diameter of the polymer-stabilized colloids. The results of both methods suggest that if all other properties of the dispersion are held constant, critical stress is independent of medium viscosity.

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Acknowledgements

The authors gratefully acknowledge the LORD Corporation and the International Fine Particle Research Institute for financial support and International Specialty Products for providing the phenyl-trimethicone.

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  1. Norman J. Wagner

    Present address: Schlumberger Technology Corporation, Sugarland, TX, 77478, USA

Authors and Affiliations

  1. Center for Molecular and Engineering Thermodynamics, Department of Chemical Engineering, University of Delaware, Newark, DE, 19716, USA

    Sudhir S. Shenoy & Norman J. Wagner

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  1. Sudhir S. Shenoy
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  2. Norman J. Wagner
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Correspondence to Norman J. Wagner.

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Shenoy, S.S., Wagner, N.J. Influence of medium viscosity and adsorbed polymer on the reversible shear thickening transition in concentrated colloidal dispersions. Rheol Acta 44, 360–371 (2005). https://doi.org/10.1007/s00397-004-0418-z

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  • DOI: https://doi.org/10.1007/s00397-004-0418-z

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