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Polyindole-Coated Soft-Magnetic Particles and their Viscoelastic Behaviors under Applied Magnetic Field
- Polyindole-Coated Soft-Magnetic Particles and their Viscoelastic Behaviors under Applied Magnetic Field
- Park, In Hye; Kwon, Seung Hyuk; Choi, Hyoung Jin; Kim, Nam-Hui; You, Chun-Yeol
- DGIST Authors
- You, Chun-Yeol
- Issue Date
- Journal of Magnetics, 24(1), 155-161
- Article Type
- Article; Proceedings Paper
- Author Keywords
- polyindole; carbonyl iron; core-shell; magnetorheological
- MAGNETORHEOLOGICAL FLUID; COMPOSITE-PARTICLES; RHEOLOGY; MICROSPHERES; TEMPERATURE; ELASTOMERS
- 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.
- Related Researcher
Spin Phenomena for Information Nano-devices(SPIN) Lab
Spintronics; Condensed Matter Physics; Magnetic Materials & Thin Films; Micromagnetic Simulations; Spin Nano-Devices
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- Department of Emerging Materials ScienceSpin Phenomena for Information Nano-devices(SPIN) Lab1. Journal Articles
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