Comprehensive magnetic particle stability together with compatibility between them and liquid medium (silicone oil) is still a crucial issue in the case of magnetorheological (MR) suspensions to guarantee their overall stability and MR performance. Therefore, this study is aimed at improving the interfacial stability between the carbonyl iron (CI) particles and silicone oil. In this respect, the particles were modified with polymer brushes and dendritic structures of poly(2-(trimethylsilyloxy)ethyl methacrylate) (PHEMATMS), called CI-brushes or CI-dendrites, respectively, and their stability properties (corrosion, thermo-oxidation, and sedimentation) were compared to neat CI ones. Compatibility of the obtained particles and silicone oil was investigated using contact angle and off-state viscosity investigation. Finally, the magneto-responsive capabilities in terms of yield stress and reproducibility of the MR phenomenon were thoroughly investigated. It was found that MR suspensions based on CI-brushes had significantly improved compatibility properties than those of neat CI ones; however, the CI-dendrites-based suspension possessed the best capabilities, while the MR performance was negligibly suppressed.

Centre of Polymer Systems Tomas Bata University in Zlin University Institute Trida T Bati 5678 76001Zlin Czech Republic

Department of Chemistry Institute of Polymer and Dye Technology Lodz University of Technology Stefanowskiego 16 90 537 Lodz Poland

Department of Physics and Materials Engineering Faculty of Technology Tomas Bata University Vavreckova 5669 76001Zlin Czech Republic

Slovak Academy of Sciences Polymer Institute Dubravska cesta 9 845 41 Bratislava Slovakia

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