Magnetorheological characteristics of carbonyl iron microparticles with different shapes

• Published in: Korea-Australia rheology journal Vol. 31; no. 1; pp. 41 - 47
• Main Authors: Lee, Jae Yun, Kwon, Seung Hyuk, Choi, Hyoung Jin
• Format: Journal Article
• Language: English
• Published: Seoul / Melbourne Korean Society of Rheology, Australian Society of Rheology 01.02.2019; Springer Nature B.V; 한국유변학회
• Subjects: Anisotropy; Carbonyls; Characterization and Evaluation of Materials; Chemistry and Materials Science; Complex Fluids and Microfluidics; Flakes; Food Science; Iron; Magnetic saturation; Magnetism; Magnetorheological fluids; Materials Science; Mechanical Engineering; Microparticles; Polymer Sciences; Rheological properties; Rheology; Sedimentation; Shape effects; Shear stress; Shear viscosity; Soft and Granular Matter; Storage modulus; 공학일반; magnetic particle; magnetorheological fluid; sedimentation; carbonyl iron
• ISSN: 1226-119X; 2093-7660
• DOI: 10.1007/s13367-019-0005-6

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.