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In this paper we performed steady shear and oscillatory magnetorheological(MR) studies in magnetic fluids containing CoNi nanoclusters of 450 nm indiameter. Co-rich nanoclusters were synthesized by conventional homogeneousnucleation without any external surfactant or reducing agent in liquid polyolat elevated temperature. The x-ray diffraction, energy dispersive X-Rayanalysis, scanning and transmission electron microscopy studies were done foranalyzing the sample composition and morphology. Two variants of fluid sampleswere prepared by dispersing 15 vol% and 20 Vol% of CoNi powders in castor oil.Room temperature steady magnetoshear studies indicate viscoplastic behaviorwith stronger dependence of static yield stress on magnetization than a dipolarcoupling that was operational in the dynamic yield stress. Magnetosweepmeasurements at constant shear rate showed interesting relaxation at highmagnetic fields. We also explored dynamical elastic behavior throughoscillatory magnetorheological studies under both strain sweep and frequencysweep modes, and showed glass transition like phenomenon occurring in themabove critical shear amplitudes.

Dynamic and rate-dependent yielding behavior of Co0.9Ni0.1 nanocluster based magnetorheological fluids