Journal
SYNTHETIC METALS
Volume 152, Issue 1-3, Pages 173-176Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2005.07.211
Keywords
electrorheology; polyaniline; titanium dioxide; hybrid; suspension
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Conducting polyaniline (PANI)/titanium dioxide (TiO2) hybrid particles were synthesized via an oxidation polymerization in the presence of TiO2, and their electrorheological (ER) characteristics were examined, since the formation of an organic/inorganic hybrid exhibits various advantages from the combination of their unique properties as a part of our efforts to find highly potential ER-active particles using conducting polymers. The TiO2 narroparticles possess a relatively high dielectric constant which is important for polarization in the ER response, in which the ER fluids are a class of colloidal suspensions which show a transition from a liquid-like to a solid-like state under an applied electric field. Synthesized PANI/TiO2 composites in this study were characterized by an FT-IR, thermogravimetry analysis, and scanning electron microscopy. We then prepared the PANI/TiO2 composites-based ER suspension with insulating oil and investigated its ER behavior as a function of shear rate under an applied electric field. The fast relaxation time of PANI/TiO2 hybrid was expected to enhance electrostatic force over shear force under a shear flow, showing the improved ER performance. Furthermore, it was also found that the properties of TiO2 affect the dielectric of PANI/TiO2 composites to give better ER properties.
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