Steady shear magnetorheology in Co0.9Ni0.1 nanocluster-based MR fluids at elevated temperatures

TL;DR

This study investigates the magnetorheological properties of Co0.9Ni0.1 nanocluster-based fluids at elevated temperatures, revealing how temperature affects shear stress, viscosity, and magnetic response through systematic experiments and rheological modeling.

Contribution

It introduces temperature-dependent magnetorheological characterization of CoNi nanocluster fluids and develops rheological master curves using superposition methods.

Findings

MR parameters decline with increasing temperature

Shear stress and viscosity decrease as temperature rises

Rheological master curves successfully describe temperature effects

Abstract

In this paper, we present the study of magnetorheological properties of magnetic fluids containing Co0.9Ni0.1 nanocluster that have been measured as a function of both magnetic field and temperature. Co-rich nanoclusters were synthesized by conventional homogeneous nucleation in liquid polyol. Morphological characterization using FESEM revealed the non-aggregated nature of nanoclusters with an average diameter of 450 nm. Crystal structure and room temperature magnetization measurements were performed by powder XRD and vibrating sample magnetometry (VSM). Two MR samples of different particle volume fractions were prepared. Temperature-dependent steady shear MR characterizations for both the samples in the range of 250C-550C demonstrated systematic decline of MR parameters with increasing temperatures. The temperature-induced thinning of shear stress and viscosity was explained in terms of change in effective volume fraction and magnetic saturation. To analyze the measured variation in MR response with increasing temperature, suitable temperature-sensitive scaling parameters were also constructed. Finally to generalize the trend, rheological master curves were constructed by using time-temperature-field superposition method.