Abstract
The improvement of the magnetorheological (MR) performance of a carbonyl iron (CI)-based MR fluid was assessed by adding nonmagnetic anisotropic snowman-like polymethyl methacrylate (PMMA) particles as an additive. The snowman-like PMMA particles were synthesized by a seed emulsion polymerization method. The rheological properties of the MR fluids with and without the additives were examined by using a rotational rheometer under various applied magnetic-field strengths. Enhanced rheological properties and improved sedimentation stability of the CI/snowman-like PMMA-based MR fluid were observed compared to those of the pure CI-based MR fluid.
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