화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korea-Australia Rheology Journal, Vol.31, No.1, 41-47, February, 2019
DOI10.1007/s13367-019-0005-6  Export Citation
Magnetorheological characteristics of carbonyl iron microparticles with different shapes
Jae Yun Lee, Seung Hyuk Kwon, and Hyoung Jin Choi†
  • Department of Polymer Science and Engineering, Inha University, Incheon 22212, Republic of Korea
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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.
Keywords:magnetic particle;carbonyl iron;magnetorheological fluid;sedimentation
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