Core-shell structured polypyrrole-coated magnetic carbonyl iron microparticles and their magnetorheology

0361183 - ÚH 2012 RIV US eng C - Conference Paper (international conference)
Sedlačík, M. - Pavlínek, V. - Sáha, P. - Švrčinová, Petra - Filip, Petr
Core-shell structured polypyrrole-coated magnetic carbonyl iron microparticles and their magnetorheology.
Novel Trends in Rheology IV. Melville, New York: American Institute of Physics, 2011 - (Zatloukal, M.), s. 284-291. AIP conference proceedings, vol. 1375. ISBN 978-0-7354-0935-4. ISSN 0094-243X.
[Novel Trends in Rheology /4./. Zlín (CZ), 27.07.2011-28.07.2011]
Grant - others:UTB Zlín(CZ) IGA/1/FT/11/D; GA MŠk(CZ) ED2.1.00/03.0111
Institutional research plan: CEZ:AV0Z20600510
Keywords : carbonyl iron * core-shell * magnetorheological suspension * polypyrrole * sedimentation * viscoelasticity
Subject RIV: BK - Fluid Dynamics

The substantial sedimentation problem of magnetorheological (MR) suspensions, due to the large density mismatch between dispersed particles and carrier medium, is a significant obstacle for their broader applications. The present paper reports the MR properties and enhanced sedimentation stability of novel core-shell structured particles with carbonyl iron as a core and polypyrrole as a shell layer dispersed in silicone oil. The coating morphology was analyzed via scanning electron microscopy and magnetic properties via vibrating sample magnetometry. The steady shear flow and small-amplitude dynamic oscillatory shear measurements were carried out to show improved MR performance. The sedimentation test showed positive role of polymeric coating, as well.
Permanent Link: http://hdl.handle.net/11104/0198565