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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>
Electrorheological characteristics of conducting polypyrrole/swollen MCM-41 nanocomposite
Fei Fei Fang,Min Seong Cho,Sang Soon Yoon,안화승,최형진 한국공업화학회 2008 Journal of Industrial and Engineering Chemistry Vol.14 No.1
Nanocomposite of mesoporous swollen MCM-41 (S-MCM-41) with conducting polypyrrole (PPY) (PPY/S-MCM-41) conned insidedispersed in silicone oil were examined under an applied electric eld. N2-adsorption isotherm and XRD analysis were employed to conrmsuccessful insertion of the PPY chain into host channels of the S-MCM-41. ER responses of the nanocomposite based ER uid wereinvestigated using a rotational rheometer, showing typical ER characteristics of the increment of shear stress as a function of an applied electriceld strength.# 2007 Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engineering Chemistry.
Electrorheologically Intelligent Polyaniline and Its Composites
Fei Fei Fang,이보미,최형진 한국고분자학회 2010 Macromolecular Research Vol.18 No.2
Electrorheological (ER) fluids are generally composed of electrically polarizable inorganic or organic particles dispersed in insulating oils. These materials are intelligent/smart materials in that they are capable of changing their state from liquid-like to solid-like very quickly under an applied electric field. This feature article reviews the literature regarding the fabrication of conducting polyaniline (PANI) and PANI composite particles,their ER performance, as well as their chemical and physical characteristics of morphology and crystal structure. The ER behavior of these intelligent materials was also analyzed using a range of rheological equations of state and their dielectric properties.