title: Core-shell structured carbonyl iron microspheres prepared via dual-step functionality coatings and their magnetorheological response.
abstract: The dispersion stability of soft magnetic carbonyl iron (CI)-based magnetorheological (MR) fluids was improved by applying a unique functional coating composed of a conducting polyaniline layer and a multiwalled carbon nanotube nest to the surfaces of the CI particles via conventional dispersion polymerization, followed by facile solvent casting. The coating morphology and thickness were analyzed by SEM and TEM imaging. Chemical composition of the polyaniline layer was detected by Raman spectroscope, which also confirmed the coating performance successfully. The influence of the functional coating on the magnetic properties was investigated by measuring the MR performance and sedimentation properties using a vibrating sample magnetometer, rotational rheometer, and Turbiscan apparatus. Improved dispersion characteristics of the MR fluid were observed.
authors.affiliation: Department of Polymer Science and Engineering, Inha University, Incheon 402-751, Korea.
authors.forename: Fei Fei
authors.initials: FF
authors.lastname: Fang
authors.forename: Ying Dan
authors.initials: YD
authors.lastname: Liu
authors.forename: Hyoung Jin
authors.initials: HJ
authors.lastname: Choi
authors.forename: Yongsok
authors.initials: Y
authors.lastname: Seo
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry; D054354:Iron Carbonyl Compounds / Q000737:chemistry*; D008280:Magnetics; D037742:Nanotubes, Carbon / Q000737:chemistry; D013059:Spectrum Analysis, Raman
chemical_list: D000814:Aniline Compounds; D037742:Nanotubes, Carbon; C416807:polyaniline; D054354:Iron Carbonyl Compounds