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Ferrofluid-based magnetorheological fluids: tuning the properties by varying the composition at two hierarchical levels

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Abstract

The magnetorheological behavior of three sets of ferrofluid-based magnetorheological (MR) fluids is investigated to determine the dependence of the static and dynamic yield stresses, as well as of the magnetoviscous effect on the volume fraction of magnetite nanoparticles φ and of the added Fe particles Φ Fe , at different values of the magnetic induction B in the MR cell. A wide range of the magnetic particle volume fractions were considered at the two hierarchical levels involved: at the nanometer level, φ = 2.75, 11.67, and 22.90 %, and at the micrometer level, Φ Fe  = 5–40 %. Taking into account also the oleic acid monolayer coating of the magnetite nanoparticles, the hydrodynamic volume fraction of the most concentrated ferrofluid results to be 65 % and, consequently, the highest value of the effective total volume fraction of the investigated extremely bidisperse MR fluids attains 85 %. The diagrams of the static and dynamic (Bingham) yield stresses and of the magnetoviscous effect offer an adequate choice of the nanometer and micrometer range particle volume fractions to fulfill the specific requirements of high-pressure rotating seals and of various MR devices.

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Acknowledgments

This work was supported by the SEMNAL MRD research project (contract nr. 77/2014-PNII-UEFISCDI) and by the Research Program LLM-CCTFA 2013-2015 of the Romanian Academy. The ferrofluid carriers and the nano–micro composite MR fluid samples were prepared by Florica Balanean, Research Ass. (RCESCF-University Politehnica Timisoara, Timisoara, Romania). The authors are indebted to Dr. Vlad Socoliuc (CFATR) for valuable discussions and to Dipl.-Phys. Oana Marinica, PhD fellow, for magnetization measurements and data interpretation concerning the most concentrated samples.

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Authors and Affiliations

  1. Research Center for Engineering of Systems with Complex Fluids, University Politehnica Timisoara, Timisoara, Romania

    Daniela Susan-Resiga

  2. Faculty of Physics, West University of Timisoara, Timisoara, Romania

    Daniela Susan-Resiga

  3. Laboratory of Magnetic Fluids, Center for Fundamental and Advanced Technical Research, Romanian Academy-Timisoara Branch, Timisoara, Romania

    Ladislau Vékás

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  1. Daniela Susan-Resiga
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  2. Ladislau Vékás
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Correspondence to Ladislau Vékás.

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Susan-Resiga, D., Vékás, L. Ferrofluid-based magnetorheological fluids: tuning the properties by varying the composition at two hierarchical levels. Rheol Acta 55, 581–595 (2016). https://doi.org/10.1007/s00397-016-0931-x

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