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Published in: Colloid and Polymer Science 2/2016

01-02-2016 | Original Contribution

Fabrication and magnetic stimuli-response of polydopamine-coated core–shell structured carbonyl iron microspheres

Authors: Yu Hyun Kim, Woo Jin Ahn, Hyoung Jin Choi, Yongsok Seo

Published in: Colloid and Polymer Science | Issue 2/2016

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Abstract

Soft magnetic carbonyl iron (CI) for application to magnetic stimuli-responsive smart materials in an external magnetic field normally implies severe sedimentation problems because of the density imbalance between the CI particles and the dispersed medium. As a new method of ameliorating this problem, CI/polydopamine (PDA) composite particles with core–shell structure were synthesized via an oxidative self-polymerization process, bringing into an account of the coating efficiency of the PDA. Surface morphology of the CI/PDA composite particles was characterized by scanning electron microscopy, while Fourier transform infrared spectroscopy, X-ray energy-dispersive spectroscopy, and vibrating sample magnetometry were adopted to measure the chemical composition, weight and atomic percentages, and magnetic properties of the fabricated composites. The magnetic stimuli-response of their magnetorheological (MR) properties was examined by using a rotational rheometer at various magnetic field strengths and compared with pristine CI-particle-based MR fluid. The measured dynamic yield stress was fitted to a universal yield stress equation well. The sedimentation properties of the CI/PDA-composite-based MR fluid were further examined by a Turbiscan™. In addition, the anti-corrosion characteristic of these particles was also investigated.

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Metadata
Title
Fabrication and magnetic stimuli-response of polydopamine-coated core–shell structured carbonyl iron microspheres
Authors
Yu Hyun Kim
Woo Jin Ahn
Hyoung Jin Choi
Yongsok Seo
Publication date
01-02-2016
Publisher
Springer Berlin Heidelberg
Published in
Colloid and Polymer Science / Issue 2/2016
Print ISSN: 0303-402X
Electronic ISSN: 1435-1536
DOI
https://doi.org/10.1007/s00396-015-3786-2

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