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

Content Provider	Springer Nature Link
Author	Kim, Yu Hyun Ahn, Woo Jin Choi, Hyoung Jin Seo, Yongsok
Copyright Year	2015
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.
Starting Page	329
Ending Page	337
Page Count	9
File Format	PDF
ISSN	0303402X
Journal	Colloid and Polymer Science
Volume Number	294
Issue Number	2
e-ISSN	14351536
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-10-16
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Carbonyl iron Polydopamine Magnetorheological Polymer Sciences Soft and Granular Matter, Complex Fluids and Microfluidics Characterization and Evaluation of Materials Physical Chemistry Food Science Nanotechnology and Microengineering
Content Type	Text
Resource Type	Article
Subject	Colloid and Surface Chemistry Materials Chemistry Physical and Theoretical Chemistry Polymers and Plastics

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