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Magnetorheology in an aging, yield stress matrix fluid

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Abstract

Field-induced static and dynamic yield stresses are explored for magnetorheological (MR) suspensions in an aging, yield stress matrix fluid composed of an aqueous dispersion of Laponite® clay. Using a custom-built magnetorheometry fixture, the MR response is studied for magnetic field strengths up to 1 T and magnetic particle concentrations up to 30 v%. The yield stress of the matrix fluid, which serves to inhibit sedimentation of dispersed carbonyl iron magnetic microparticles, is found to have a negligible effect on the field-induced static yield stress for sufficient applied fields, and good agreement is observed between field-induced static and dynamic yield stresses for all but the lowest field strengths and particle concentrations. These results, which generally imply a dominance of inter-particle dipolar interactions over the matrix fluid yield stress, are analyzed by considering a dimensionless magnetic yield parameter that quantifies the balance of stresses on particles. By characterizing the applied magnetic field in terms of the average particle magnetization, a rheological master curve is generated for the field-induced static yield stress that indicates a concentration–magnetization superposition. The results presented herein will provide guidance to formulators of MR fluids and designers of MR devices who require a field-induced static yield stress and a dispersion that is essentially indefinitely stable to sedimentation.

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Acknowledgements

Acknowledgement is made to the Donors of the American Chemical Society Petroleum Research Fund (ACS-PRF Grant No. 49956-ND9) for financial support of this research. The authors are especially grateful to Dr. Murat Ocalan for assistance and many helpful discussions regarding the custom-built magnetorheometry fixture. Further acknowledgement is given to Ki Wan Bong, Dr. Matthew Helgeson, and Dr. Dong Hun Kim for help with SEM imaging, particle size characterization, and Magnetometer measurements, respectively.

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Authors and Affiliations

  1. Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA

    Jason P. Rich & Patrick S. Doyle

  2. Hatsopoulos Microfluids Laboratory, Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA

    Gareth H. McKinley

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  1. Jason P. Rich
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  2. Patrick S. Doyle
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  3. Gareth H. McKinley
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Correspondence to Gareth H. McKinley.

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Rich, J.P., Doyle, P.S. & McKinley, G.H. Magnetorheology in an aging, yield stress matrix fluid. Rheol Acta 51, 579–593 (2012). https://doi.org/10.1007/s00397-012-0632-z

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  • DOI: https://doi.org/10.1007/s00397-012-0632-z

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