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Viscoelastic properties of electrorheological suspensions of core-shell (carbon/polyaniline) particles in silicone oil
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SYSNO ASEP 0392400 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Viscoelastic properties of electrorheological suspensions of core-shell (carbon/polyaniline) particles in silicone oil Author(s) Sedlačík, M. (CZ)
Almajdalawi, S. (CZ)
Mrlík, M. (CZ)
Pavlínek, V. (CZ)
Saha, P. (CZ)
Stejskal, Jaroslav (UMCH-V) RID, ORCID, SAISource Title Journal of Physics: Conference Series. - : Institute of Physics Publishing - ISSN 1742-6588
Roč. 412, č. 1 (2013), 012006_1-012006_8Number of pages 8 s. Action International Conference on Electrorheological Fluids and Magnetorheological Suspensions /13./ - ERMR2012 Event date 02.07.2012-06.07.2012 VEvent location Ankara Country TR - Turkey Event type WRD Language eng - English Country GB - United Kingdom Keywords polyaniline ; carbonization ; electrorheology Subject RIV BK - Fluid Dynamics R&D Projects GA202/09/1626 GA ČR - Czech Science Foundation (CSF) Institutional support UMCH-V - RVO:61389013 UT WOS 000317122500006 EID SCOPUS 84875752042 DOI 10.1088/1742-6596/412/1/012006 Annotation Carbon/polyaniline particles with core-shell structure were synthesized as a novel dispersed phase for electrorheological (ER) suspensions in this study. Core of these composite particles was obtained by carbonization of polyaniline base in an inert atmosphere of nitrogen at 650°C and then coated with polyaniline shell. The morphology and composition of prepared particles were examined with scanning electron microscopy and Fourier transform infrared spectroscopy, respectively. The analysis revealed the conversion of polyaniline to carbon via ring-opening that happened during the carbonization process and successful coating of carbonized particles with shell layer. The products retained the original granular structure after carbonization as well as after the coating. The dielectric spectra analysis suggests high particle polarizability of carbonized material. Thus, the measurements performed under oscillatory shear flow showed a remarkably high ER intensity at relatively low electric field strengths. Coating of carbonized particles by polyaniline base changes compatibility of particle surface with silicone oil medium and, consequently, flow properties of suspensions in the absence of electric field, but it does not influence the shear rate dependence of the complex viscosity in the electric field. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2014
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