Abstract
Two different shapes of spherical- and flake-like soft-magnetic carbonyl iron (CI) microparticles were dispersed in silicone oil to prepare magnetorheological (MR) fluids. The magnetic-field dependent rheological behaviors of the MR fluids were scrutinized focusing on their shape effect. Saturation magnetization of the flake-shaped CI was obtained to be slightly lower than that of spherical-shaped CI. However, rheological properties of shear stress, shear viscosity, and storage modulus of the flake-shaped CI MR fluid surpassed those of the spherical-shaped CI MR suspension under applied magnetic field strengths. The flake-shaped CI based MR fluid also demonstrated superior sedimentation stability compared with the spherical-shaped CI. This was due to large surface area, suggesting that the anisotropy of CI particles plays an important role in their MR performance.
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Lee, J.Y., Kwon, S.H. & Choi, H.J. Magnetorheological characteristics of carbonyl iron microparticles with different shapes. Korea-Aust. Rheol. J. 31, 41–47 (2019). https://doi.org/10.1007/s13367-019-0005-6
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DOI: https://doi.org/10.1007/s13367-019-0005-6