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Conducting polymer/clay nanocomposites and their applications.
Fang, Fei Fei,Choi, Hyoung Jin,Joo, Jinsoo American Scientific Publishers 2008 Journal of Nanoscience and Nanotechnology Vol.8 No.4
<P>This review aims at reporting on interesting and potential aspects of conducting polymer/clay nanocomposites with regard to their preparation, characteristics and engineering applications. Various conducting polymers such as polyaniline, polypyrrole and copolyaniline are introduced and three different preparation methods of synthesizing conducting polymer/clay nanocomposites are being emphasized. Morphological features, structure characteristics and thermal degradation behavior are explained based on SEM/TEM images, XRD pattern analyses and TGA/DSC graphs, respectively. Attentions are also being paid on conductive/magnetic performances as well as two potential applications in anti-corrosion coating and electrorheological (ER) fluids.</P>
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 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>
Fei Fang, Fei,Hye Kim, Ji,Jin Choi, Hyoung,Seo, Yongsok Wiley Subscription Services, Inc., A Wiley Company 2007 Journal of applied polymer science Vol.105 No.4
<P>Barium titanate (BaTiO<SUB>3</SUB>) inorganic particles which possess large electronic resistance and excellent dielectric properties were employed to synthesize conducting polyaniline (PANI)/BaTiO<SUB>3</SUB> composites via an in situ oxidative polymerization, since conducting PANI/inorganic composites have been considered as a superior candidate of electrorheological (ER) fluids because of their physical properties, unique structure, and the combined merits of the two phases. The influence of the fraction of BaTiO<SUB>3</SUB> particles in the as-synthesized composites on the physical properties (morphology and crystal structure) and the ER behaviors were examined. Yield stress data obtained were analyzed based on the universal yield stress equation as a function of applied electric field and it was found that the universal yield stress equation collapses these data onto a single curve independent of BaTiO<SUB>3</SUB> particle concentration. Their shear stresses under an applied electric field were also found to be fitted well with the Cho–Choi–Jhon model. In addition, the investigated dielectric spectra were found to be useful to interpret the differences in the ER performances for the PANI/BaTiO<SUB>3</SUB> composite based ER fluids. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007</P>