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Core/Shell Iron/Oxide Nanoparticles for Improving the Magneto‐Dielectric Properties of Polymer Composites
Author(s) -
Yang TaI,
Chuang ChunYu,
Yang ShuChian,
Kempel Leo C.,
Kofinas Peter
Publication year - 2016
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201500234
Subject(s) - materials science , composite material , dielectric , iron oxide , polydimethylsiloxane , nanoparticle , permittivity , magnetic nanoparticles , dielectric loss , polymer , oxide , doping , core (optical fiber) , nanotechnology , metallurgy , optoelectronics
A simple method to obtain high magnetic permeability ( μ r ), high dielectric permittivity ( ϵ r ), and low loss polymer composites with core/shell iron/metal oxide particles is developed. Magnetic iron (Fe 0 ) particles with protective SiO 2 shells are synthesized in aqueous environment at room temperature. The shells provide electrical insulting layers which decrease energy loss and also prevent the possibility of μ r decrease due to Fe 0 oxidation. Furthermore, Fe 0 particles could also be coated with TiO 2 shells which allow ϵ r to be tuned. The ϵ r and μ r of the resulting polydimethylsiloxane composites are optimized for core‐shell particle doping. The value of ϵ r is up to 9.8 and most importantly, the μ is close to 2 at 1 GHz with 43 wt% doping of core‐shell particles. The dielectric loss of the composites is less than 0.02.