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The spherical Fe3O4 with 300 nm in diameter was synthesized by typicalthermal decomposition of Fe (III) organo-metallic precursor in polyol andpolyacrylic acid. Fe-nanorods were prepared by reducing Fe (III) nitrate inpresence of polyol-hydrazine-CTAB. Morphology and magnetic characterization ofthe nanoparticles were performed by ESEM, XRD and VSM studies. We performeddetailed non-linear magnetorheological properties of three MR fluids (10 vol%)containing isotropic Fe3O4 and anisotropic Fe-nanorods under both small andlarge amplitude oscillatory flow. The MR samples demonstrated strongmagnetorheological Payne effect i.e. rapid stress relaxation under increasingdeformation and uniform magnetic field beyond linear viscoelastic region (LVR),which has not been studied in-depth in conventional MR fluids. We have alsoshown that stress softening was more pronounced for MR fluids with higheranisotropic contents, in contrast to isotropic MR fluid. The onset strains forLVR to non-linear region transition for anisotropic fluids were much lower thanthat of isotropic spherical nanoparticle-containing fluid. The stronger MRresponse for nanorod-containing MR fluids can be explained in terms of enhancedfield-induced structuration.

Magnetorheological Payne effect in bidisperse MR fluids containing Fe nanorods and Fe3O4 nanospheres: a dynamic rheological study