Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 128, Issue 5, Pages 2977-2982Publisher
WILEY-BLACKWELL
DOI: 10.1002/app.38473
Keywords
carbonyl iron; core-shell; magnetorheological fluid; polypyrrole; viscoelasticity; ribbon-like particles
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Funding
- Operational Program Research and Development for Innovations
- European Regional Development Fund (ERDF)
- national budget of the Czech Republic, within Centre of Polymer Systems [CZ.1.05/2.1.00/03.0111]
- TBU in Zlin [IGA/1/FT/11/D]
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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. (c) 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
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