Abstract

MESQUIDA, C et al. Study of an oil based magnetorheological fluid with Ni nanoparticles. An. AFA [online]. 2017, vol.28, n.2, pp.50-55. ISSN 0327-358X.

Magnetorheological fluids (MRF) are of interest since they can modify the design and operation of electromechanical devices due to their capacity to significantly change their viscosity under the influence of a magnetic field. This fact has stimulated an intense research activity with the aim of developing applications in electromechanical systems. In this work we synthesized and characterized Ni nanoparticles (Ni NP) for their latter use as a MRF component using vegetal oil as the continuum phase. For this suspension, the shear frequency and magnetic field-dependent viscosity, as well as the viscoelastic behavior as a function of the oscillatory applied load, are measured. It is found that the apparent viscosity increases with the applied magnetic field. Also, the applied magnetic field induces changes in the viscoelastic properties of the fluid, which turns to be dominated by the elastic or storage mode along the whole range of frequencies tested. The viscoelastic performance of the present Ni NP suspension reveals an interesting magnetorheological behavior, when compared to other magnetic fluids reported in the literature, namely, those based on commercial iron and iron oxide particles, materials that are more generally used for this type of applications.

Keywords : Magnetorheological fluids; Ni nanoparticles; Viscosity; Elasticity.

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