Synthesis and magnetorheological characteristics of ribbon-like, polypyrrole-coated carbonyl iron suspensions under oscillatory shear

0395193 - ÚH 2014 RIV US eng J - Článek v odborném periodiku
Mrlik, M. - Sedlačík, M. - Pavlinek, V. - Bažant, P. - Sáha, P. - Peer, Petra - Filip, Petr
Synthesis and magnetorheological characteristics of ribbon-like, polypyrrole-coated carbonyl iron suspensions under oscillatory shear.
Journal of Applied Polymer Science. Roč. 128, č. 5 (2013), s. 2977-2982. ISSN 0021-8995. E-ISSN 1097-4628
Grant ostatní: GA MŠk(CZ) ED2.1.00/03.0111; UTB Zlín(CZ) IGA/1/FT/11/D
Institucionální podpora: RVO:67985874
Klíčová slova: carbonyl iron * core-shell * magnetorheological fluid * polypyrrole * viscoelasticity * ribbon-like particles
Kód oboru RIV: BK - Mechanika tekutin
Impakt faktor: 1.640, rok: 2013

One of the crucial problems of classical magnetorheological (MR) fluids is their high rate of sedimentation. This disadvantage may be substantially eliminated using core-shell particles. The aim of this study is to prepare spherical carbonyl iron (CI) particles coated with conducing polymer polypyrrole (PPy) with ribbon-like morphology. Scanning electron microscopy proved the formation of the ribbon-like layer onto CI particles while Fourier transform infrared spectroscopy confirmed the chemical structure of PPy. The magnetic properties observed via vibrating sample magnetometer showed decreased magnetization saturation of core-shell-structured particles due to the existence of non-magnetic surface layer. MR measurements performed under oscillatory shear flow as a function of the applied magnetic flux density, temperature, and particle concentration showed that core-shell particle-based MR suspension exhibits sufficient MR performance for practical applications. Moreover, the suspension stability is promoted significantly when core-shell particles are used as a dispersed phase.
Trvalý link: http://hdl.handle.net/11104/0231147