Magnetorheological carbonyl iron particles doubly wrapped with polymer and carbon nanotube

Title
Magnetorheological carbonyl iron particles doubly wrapped with polymer and carbon nanotube
Authors
Ko, S.W.; Lim, J.Y.; Park, B.J.; Yang, M.S.; Choi, H.J.
Keywords
SUSPENSIONS
Issue Date
2009-04
Publisher
AMER INST PHYSICS
Abstract
To improve magnetorheological (MR) characteristics of carbonyl iron (CI) microparticles, we introduce two-step CI coating procedures with poly(methyl methacrylate) (PMMA) and multiwalled carbon nanotube (MWNT) for the first time. Core(CI)-shell(PMMA) (CI-PM) structured composite magnetic microbeads were synthesized by dispersion polymerization first, showing improved dispersion stability and sedimentation quality. However, its magnetic strength was decreased compared with that of pristine CI-based MR fluid. To enhance its magnetic strength, the core-shell type CI-PM particles were wrapped with MWNT via ultrasonication. Rheological properties of their MR fluid were measured by a rotational rheometer with a magnetic field supplier. The CI-PMMA-MWNT (CI-PM-NT) particles were found to show better flow and dynamic rheological properties compared to those from CI-PM particles while density of the CI-PM-NT particles was not much different from that of CI-PM, implying that sedimentation stability of the CI-PM-NT particles was also being kept.
URI
http://dspace.inha.ac.kr/handle/10505/1688
ISSN
0021-8979
Appears in Collections:
College of Engineering(공과대학) > Polymer Science and Engineering (고분자공학) > Journal Papers, Reports(고분자공학 논문, 보고서)
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