Abstract
Magnetorheological (MR) fluids, suspensions of magnetic particles in a nonmagnetic fluid, are fascinating materials due to their easily controllable characteristics and wide range of applications. In the efforts to elucidate MR characteristics and its potential engineering application, various theoretical and experimental approaches have been adopted into both synthesis of MR-materials and device-design. In this study, the effort to solve and combine these contradicting factors into the conventional iron particle systems is presented. Carbonyl iron (CI) particles in suspending medium can easily make cake-form after temporal storage or in specific conditions, leading to malfunction of MR devices. Novel submicron-sized particles (organoclay) were mixed into CI based MR fluid via carefully designed mixing procedure. Such plate-like organoclay enhanced the resistance to sedimentation and improved flocculation stability without any noticeable change in MR properties. This gap-filling sub micron-sized particle between micron-size CI spheres played the role to prevent direct physical contact of CI particles and made it easier to re-disperse than CI only suspension.
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