Abstract
In this paper, we report the dielectric properties of composite systems (nanodielectrics) made of small amounts of mono dispersed magnetic nanoparticles embedded in a polymer matrix. It is observed from the transmission electron microscope images that the matrix polymeric material is confined in approximately 100 nm size cages between particle clusters. The particle clusters are composed of separated spherical particles which comprise unconnected networks in the matrix. The dielectric relaxation and breakdown characteristics of the matrix polymeric material are altered with the addition of nanometer size cobalt iron-oxide particles. The dielectric breakdown measurements performed at 77 K showed that these nanodielectrics are potentially useful as an electrical insulation material for cryogenic high voltage applications. Finally, structural and dielectric properties of nanocomposite dielectrics are discussed to present plausible reasons for the observed low effective dielectric permittivity values in the present and similar nanodielectric systems. It is concluded that polymeric nanoparticle composites would have low dielectric permittivity regardless of the permittivity of nanoparticles are when the particles are coordinated with a low dielectric permittivity surfactant.
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The research was sponsored by three different sources: (i) the Laboratory Directed Research and Development (LDRD) Program of Oak Ridge National Laboratory (ORNL), managed by UT-Battelle, LLC for the U.S. Department of Energy under Contract No. DE-AC05-00OR22725 (D06-100), (ii) by the U.S. Department of Energy, Office of Electricity Delivery and Energy Reliability, Superconductivity Program for Electric Power Systems, under contract No. DE-AC05-00OR22725 with UT-Battelle, LLC, and (iii) by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy.
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Tuncer, E., Rondinone, A.J., Woodward, J. et al. Cobalt iron-oxide nanoparticle modified poly(methyl methacrylate) nanodielectrics. Appl. Phys. A 94, 843–852 (2009). https://doi.org/10.1007/s00339-008-4881-8
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DOI: https://doi.org/10.1007/s00339-008-4881-8