Abstract
In this paper, the bidisperse magnetorheological (BMR) fluids containing micron carbonyl iron (CI) particles, nanoscale magnetite (Fe3O4) and gelatin were prepared. Gelatin was used as a coating layer to improve stability of bidisperse particles and restrict the oxidation of Fe3O4. Under the effect of magnetic field, Fe3O4 particles were attached at the end of CI chains and filled into the interspace of micron CI particles, which influences the interactions among BMR fluids. Some groups with different concentrations and mass fractions of gelatin and Fe3O4 were considered to reveal the sedimentation characterization of BMR fluids. The BMR fluids showed enhanced dispersion stability.
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