화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.112, 58-66, August, 2022
DOI10.1016/j.jiec.2022.04.035  Export Citation
Magneto-dielectric and viscoelastic characteristics of iron oxide microfiber-based magnetoreological suspension
Qu Lu1, 2, Maria Balasoiu3, 4, Hyoung Jin Choi1, 2, †, Eugen M. Anitas3, 4, Ioan Bica5, †, and Larisa Marina Elisabeth Cirigiu6
  • 1Department of Polymer Science and Engineering, Inha University, Incheon 22212, Korea
  • 2Program of Environmental and Polymer Engineering, Inha University, Incheon 22212, Korea
  • 3Joint Institute for Nuclear Research, Joliot Curie 6, 141980 Dubna, Moscow Region, Russia, Russian Federation
  • 4Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, Reactorului 30, RO-077125 Ma˘gurele, Romania
  • 5Institute of Advanced Environmental Research, West University of Timișoara, Timișoara, 300223, Timiș County, Romania
  • 6University of Medicine and Pharmacy, Craiova, Romania
E-mail:,
Four types of magnetorheological (MR) suspensions with four different amounts of iron oxide microfibers were prepared. Electrical devices made with these MR suspensions were introduced into a static magnetic field, being superimposed over AC field with a standard frequency of 1 kHz to measure their both equivalent electrical capacity and equivalent electrical resistance. The components of the complex dielectric permittivity obtained are influenced by the amounts of microfibers, and the relative dielectric permittivity and dielectric loss coefficient increase with magnetic field strength. The obtained effects are due to the species of iron oxides in the microfibers used in the manufacture of MR suspensions. The viscoelastic characteristics of MR suspensions were examined by steady shear flow and dynamic oscillatory tests using a rheometer under different magnetic field strengths. The Ms value of the iron micro-fibers was 22:7 Am2/kg , and the shear stress curves were fitted well using Herschel-Bulkley equation to find the yield stress, which was up to 98 Pa in a magnetic field of 257 kA/m.
Keywords:Magnetorheological;Suspension;Magnetite;Dielectric loss;Silicone oil
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