Abstract
Abstract In this paper, we discussed the structure and morphologies of monodispersed CoNi nanoplatelets synthesized by hydrothermal reduction. The growth mechanism of platelet-like nanoparticles from precursors were described with reference to the SEM analysis. We further studied the effect of polymer and surfactants on to the structure, surface and magnetic properties of the nanostructures. Furthermore, in order to emphasize a shape-rheology correlation, magnetorheological studies were performed with suspensions containing CoNi nanoplatelets for the concentrations ranging from 5 to 12 vol%. The effect of plate orientation under the oscillatory shear was also investigated and an interesting two-step yielding was observed for the magnetic fluids with high particle volume fraction and under high magnetic fields. This was explained in terms of magnetic structure disintegration under shear flow below and beyond the critical amplitude strain.
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