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

TL;DR

This study investigates the nonlinear magnetorheological Payne effect in bidisperse MR fluids containing Fe nanorods and Fe3O4 nanospheres, revealing enhanced field-induced structuration and stress softening related to particle anisotropy.

Contribution

It provides the first detailed analysis of the Payne effect in MR fluids with anisotropic nanorods versus isotropic nanospheres, highlighting the impact of particle shape on rheological behavior.

Findings

Stronger MR response observed with nanorods due to enhanced structuration.

Stress softening more pronounced in fluids with higher anisotropic content.

Lower onset strains for non-linear behavior in anisotropic nanoparticle fluids.

Abstract

The spherical Fe3O4 with 300 nm in diameter was synthesized by typical thermal decomposition of Fe (III) organo-metallic precursor in polyol and polyacrylic acid. Fe-nanorods were prepared by reducing Fe (III) nitrate in presence of polyol-hydrazine-CTAB. Morphology and magnetic characterization of the nanoparticles were performed by ESEM, XRD and VSM studies. We performed detailed non-linear magnetorheological properties of three MR fluids (10 vol%) containing isotropic Fe3O4 and anisotropic Fe-nanorods under both small and large amplitude oscillatory flow. The MR samples demonstrated strong magnetorheological Payne effect i.e. rapid stress relaxation under increasing deformation and uniform magnetic field beyond linear viscoelastic region (LVR), which has not been studied in-depth in conventional MR fluids. We have also shown that stress softening was more pronounced for MR fluids with higher anisotropic contents, in contrast to isotropic MR fluid. The onset strains for LVR to non-linear region transition for anisotropic fluids were much lower than that of isotropic spherical nanoparticle-containing fluid. The stronger MR response for nanorod-containing MR fluids can be explained in terms of enhanced field-induced structuration.