Abstract
In this paper, the magnetorheological (MR) and magnetoviscous properties of ferrofluid-based iron particle suspensions were investigated. The 2.1-µm mean size Fe particles were dispersed in high-concentration transformer oil-based ferrofluid, the iron particle volume fraction in the resulting nano-micro composite magnetorheological fluid samples varying from Φ Fe = 5 to 40 %. The ferrofluid carrier has φ p = 23 % solid volume fraction of magnetic nanoparticles stabilized with chemisorbed oleic acid monolayer and without any excess surfactant. In the absence of the field, the ferrofluid has a quasi-Newtonian behavior with a weak shear thinning tendency. The static yield stress shows an increase of about 3 orders of magnitude for an iron particle content of approx. Φ Fe = 25 % (Φ tot = 42.25 %), while above this value, a saturation tendency is observed. The dynamic yield stress (Bingham model) also increases with the magnetic induction and the particle volume fraction; however, the saturation of the MR effect is less pronounced. The relative viscosity change has a maximum at Φ Fe = (10–15) % due to the accelerated increase of the effective viscosity of the composite for higher Fe content. Addition of micrometer-sized iron particles to a concentrated ferrofluid without any supplementary stabilizing agent proved to be a direct and simple way to control the magnetorheological and magnetoviscous behavior, as well as the saturation magnetization of the resulting nano-micro composite fluid to fulfill the requirements of their use in various MR control and rotating seal devices.
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Acknowledgments
This work was supported by the MagNanoMicroSeal research project (contract no. 157/2012-PNII-UEFISCDI) and by the Research Program LLM-CCTFA 2013–2015 of the Romanian Academy. The concentrated ferrofluid carrier and the nano-micro composite MR fluid samples were provided by ROSEAL Co. Odorheiu Secuiesc (Romania). The critical comments and helpful suggestions of the referee(s) are gratefully acknowledged. The authors are indebted to Dipl.-Phys. Oana Marinica, PhD fellow, for the VSM measurements of the magnetizable fluid samples. Many thanks are due to Dr. Vlad Socoliuc for fruitful discussions.
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Susan-Resiga, D., Vékás, L. Yield stress and flow behavior of concentrated ferrofluid-based magnetorheological fluids: the influence of composition. Rheol Acta 53, 645–653 (2014). https://doi.org/10.1007/s00397-014-0785-z
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DOI: https://doi.org/10.1007/s00397-014-0785-z