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Synthesis of core-shell formed carbonyl iron/polydiphenylamine particles and their rheological response under applied magnetic fields

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Abstract

Soft-magnetic carbonyl iron (CI) microspheres were coated with conducting polydiphenylamine (PDPA) using an oxidative dispersion polymerization process to produce core-shell-structured CI/PDPA particles for magnetorheological (MR) applications. The CI particles were initially modified with a p-amino benzoic acid to enhance their affinity to PDPA. The surface morphology of the CI/PDPA core-shell particles was characterized by scanning electron microscopy. The chemical composition, weight and atom percentage, thermal properties, and magnetism of the composites were investigated by X-ray energy dispersive spectroscopy, Fourier-transformed infrared spectroscopy, thermogravimetric analysis, and vibrating-sample magnetometry, respectively. The rheological behavior of the MR fluids for both pristine CI and CI-PDPA particles dispersed in silicone oil was measured using a rotating rheometer. The sedimentation characteristics of the CI/PDPA-based MR fluid with improved dispersion stability due to the reduced density mismatch was analyzed further using a Turbiscan.

Carbonyl iron particles coated with polydiphenylamine for their application to MR fluids when dispersed in silicone oil were produced through an oxidative polymerization process. Their MR behaviors of steady flow and dynamic oscillation were observed using a rotational rheometer along with their improved dispersion stability.

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Funding

This work was supported by National Research Foundation of Korea (2018R1A4A1025169).

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  1. Department of Polymer Science and Engineering, Inha University, Incheon, 22212, Republic of Korea

    Jin Hee Lee & Hyoung Jin Choi

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  1. Jin Hee Lee
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Correspondence to Hyoung Jin Choi.

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Lee, J.H., Choi, H.J. Synthesis of core-shell formed carbonyl iron/polydiphenylamine particles and their rheological response under applied magnetic fields. Colloid Polym Sci 296, 1857–1865 (2018). https://doi.org/10.1007/s00396-018-4405-9

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  • DOI: https://doi.org/10.1007/s00396-018-4405-9

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