title: Nanostructured magnetic particles with polystyrene and their magnetorheological applications.
abstract: Magnetorheological (MR) fluids are known to be colloidal suspensions of magnetic particles in a non-magnetic fluid, and exposure to a magnetic field transforms the fluid into a plastic-like solid in milliseconds. To improve the stability against sedimentation and uniform dispersion, two different MR candidates, soft magnetic carbonyl iron (CI) microspheres and magnetite (Fe3O4) particles were modified with polystyrene to be applied for MR fluids in this study. After modification, their unique morphology, crystalline structure and magnetic properties were examined in addition to MR performance and sedimentation characteristics. It was found that this embedded morphology not only effectively prevents direct contact of the magnetic species thus improving particle dispersion but also leads to obvious change in their density, compared with the traditional polymer coating method with a core-shell structure.
authors: Department of Polymer Science and Engineering, Inha University, Incheon 402-751, Korea.
authors: Fei Fei
authors: FF
authors: Fang
authors: Hyoung Jin
authors: HJ
authors: Choi
mesh_terms: D003460:Crystallization / Q000379:methods*; D008280:Magnetics; D058185:Magnetite Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D008422:Materials Testing; D008968:Molecular Conformation; D011137:Polystyrenes / Q000737:chemistry*; D013499:Surface Properties; D014783:Viscosity
chemical_list: D058185:Magnetite Nanoparticles; D011137:Polystyrenes