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Synthesis and magnetorheological characteristics of ribbon-like, polypyrrole-coated carbonyl iron suspensions under oscillatory shear
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SYSNO ASEP 0395193 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Synthesis and magnetorheological characteristics of ribbon-like, polypyrrole-coated carbonyl iron suspensions under oscillatory shear Tvůrce(i) Mrlik, M. (CZ)
Sedlačík, M. (CZ)
Pavlinek, V. (CZ)
Bažant, P. (CZ)
Sáha, P. (CZ)
Peer, Petra (UH-J) ORCID, SAI, RID
Filip, Petr (UH-J) ORCID, RID, SAIZdroj.dok. Journal of Applied Polymer Science. - : Wiley - ISSN 0021-8995
Roč. 128, č. 5 (2013), s. 2977-2982Poč.str. 6 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova carbonyl iron ; core-shell ; magnetorheological fluid ; polypyrrole ; viscoelasticity ; ribbon-like particles Vědní obor RIV BK - Mechanika tekutin Institucionální podpora UH-J - RVO:67985874 UT WOS 000315910500049 DOI 10.1002/app.38473 Anotace 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. Pracoviště Ústav pro hydrodynamiku Kontakt Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003 Rok sběru 2014
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