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Polymeric nanobead coated carbonyl iron particles and their magnetic property
Fang, Fei Fei,Choi, Hyoung Jin WILEY-VCH Verlag 2007 Physica status solidi. PSS. A, Applications and ma Vol.204 No.12
<P>Magnetic carbonyl iron (CI) particles have attracted great attention due to their high saturation magnetization and appropriate particle size for magnetorheological (MR) materials. However, hydrodynamic instability of the CI particle suspension which was attributed to the large density mismatch between the dispersed CI particles and the medium has affected its predominant role for MR applications. A novel magnetic CI/polystyrene (PS) composite with nano-scaled PS spheres sprinkled on the surface of the CI particles was fabricated via a normal dispersion polymerization in this work. Physical properties, MR behaviors as well as the improvement in sedimentation problem were investigated. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>
Fang, Fei Fei,Choi, Hyoung Jin,Seo, Yongsok American Chemical Society 2010 ACS APPLIED MATERIALS & INTERFACES Vol.2 No.1
<P>A two-step process for the sequential coating of magnetic carbonyliron (CI) particles with polystyrene (PS) and multiwalled carbon nanotubes (MWCNTs) was used to improve the sedimentation stability of micrometer-sized magnetic CI particles for magnetorheological (MR) applications under an applied magnetic field. The CI particles were initially coated with nanosized PS beads using an in situ dispersion polymerization method and then wrapped with a dense MWCNT nest through a solvent-casting method in a water/oil emulsion system. The morphology, MR performance, and sedimentation stability of the synthesized magnetic composite particles were examined. The composite particles showed enhanced MR characteristics and dispersion stability.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2010/aamick.2010.2.issue-1/am900577w/production/images/medium/am-2009-00577w_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am900577w'>ACS Electronic Supporting Info</A></P>
Fang, Fei Fei,Choi, Hyoung Jin,Seo, Yongsok American Scientific Publishers 2010 Journal of Nanoscience and Nanotechnology Vol.10 No.1
<P>Taking into account of unique merits of conducting polymer/inorganic nanocomposites which play a positive effect in enhancing electrorheological (ER) performances, we adopted exfoliated clay sheet as a stabilizer to fabricate novel nano-scaled polyaniline (PANI) granules (PANI/clay) via pickering inverse emulsion polymerization in this study. Successfully synthesized PANI nano-spheres which were initialized by oil-soluble benzoyl peroxide possessed polydispersed size distribution. These armed PANI nanoparticles, of which the surface is compactly wrapped by clay sheets, are observed, as confirmed by SEM and TEM images. Some nano-scaled particles even possess irregular shape with sharp angle because clay plates are difficult to be bended to follow the spherical trace due to the extremely small size of PANI granules. The extent of exfoliation of Clay sheets covered on the surface of PANI particles were characterized by XRD pattern which did not indicate any obvious sharp peak, demonstrating the nearly completely exfoliated clay layers. TGA spectra also gave some additional information on thermal stability and mass composition. At last, an ER fluid was prepared by dispersing PANI/clay nanoparticles in silicone oil and the ER performances were investigated via a rotational test.</P>