Rheological effect of Zn-doped ferrite nanoparticle additive with enhanced magnetism on micro-spherical carbonyl iron based magnetorheological suspension

초록

Spinel ferrite nanoparticles with enhanced magnetism were prepared by non-stoichiometric doping of Zn cation to magnetite and adopted as an additive into carbonyl iron (CI)-based magnetorheological (MR) suspension, with the expectation of improved MR effect and suspension stability. Rheological characteristics of the MR fluids both with and without an additive were analyzed using a rotational rheometer. The addition of 0.5 wt% Zn-doped ferrite (ZnxFe3-xO4) to the MR fluid enhanced not only the MR performance but also sedimentation stability, as confirmed by Turbiscan. The nanoparticles of truncated octahedron-like shape were thought to be inserted into the free volume between microparticles.

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