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Polyindole-Coated Soft-Magnetic Particles and their Viscoelastic Behaviors under Applied Magnetic Field

Title
Polyindole-Coated Soft-Magnetic Particles and their Viscoelastic Behaviors under Applied Magnetic Field
Authors
Park, In HyeKwon, Seung HyukChoi, Hyoung JinKim, Nam-HuiYou, Chun-Yeol
DGIST Authors
You, Chun-Yeol
Issue Date
2019-03
Citation
Journal of Magnetics, 24(1), 155-161
Type
Article
Article Type
Article; Proceedings Paper
Author Keywords
polyindolecarbonyl ironcore-shellmagnetorheological
Keywords
MAGNETORHEOLOGICAL FLUIDCOMPOSITE-PARTICLESRHEOLOGYMICROSPHERESTEMPERATUREELASTOMERS
ISSN
1226-1750
Abstract
To solve the sedimentation drawback of soft-magnetic carbonyl-iron (CI) particles for their application to a magneto-rheological (MR) fluid, the coating of a polyindole (PIn) onto the surfaces of CI microspheres was introduced through chemical oxidization polymerization using 4-aminobenzoic acid as a grafting chemical to increase the interaction between CI particles and PIn. The coated morphology was confirmed using a scanning electron microscope, whereas the reduced density was examined through a gas pycnometer. The effect of the coating on MR performance was analyzed using a rotation rheometer connected with a magnetic field generator. Based on the results of a dynamic oscillation rheological test, the CI/PIn-based MR fluid exhibited a more elastically solid behavior with the applied magnetic fields when compared to a pure CI-based MR suspension, showing an increased magnetic-field strength-dependent storage modulus from a strain sweep test. With a solid-like behavior under an applied external magnetic field, the storage modulus was observed to be higher than the loss modulus within the entire frequency range. © The Korean Magnetics Society. All rights reserved.
URI
http://hdl.handle.net/20.500.11750/9773
DOI
10.4283/JMAG.2019.24.1.155
Publisher
한국자기학회
Related Researcher
  • Author You, Chun-Yeol Spin Phenomena for Information Nano-devices(SPIN) Lab
  • Research Interests Spintronics; Condensed Matter Physics; Magnetic Materials & Thin Films; Micromagnetic Simulations; Spin Nano-Devices
Files:
There are no files associated with this item.
Collection:
Department of Emerging Materials ScienceSpin Phenomena for Information Nano-devices(SPIN) Lab1. Journal Articles


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