ACTA

Magnetodielectric Properties of Transformer Oil Based Magnetic Fluids

M. Timko^a, P. Kopcansky^a, M. Molcan^a, L. Tomco^b, K. Marton^c, S. Molokac^d, P. Rybar^d, F. Stoian^e, S. Holotescu^e and A. Taculescu^f
^aInstitute of Experimental Physics, Slovak Academy of Sciences, 040 01 Kosice, Slovakia
^bFaculty of Aeronautic, Technical University in Kosice, 041 21 Kosice, Slovakia
^cFaculty of Electrical Engineering and Informatics, Technical University in Kosice, 042 00 Kosice, Slovakia
^dFaculty of Mining, Ecology, Process Control and Geotechnology, TU Kosice, Letna 9, 042 00 Kosice, Slovakia
^ePolitehnica University of Timisoara, Timisoara 300222, Romania
^fLaboratory of Magnetic Fluids, Romanian Academy - Timisoara Division, Timisoara, Romania

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This contribution is devoted to study of dielectric and magnetodielectric properties in transformer oil based magnetic fluid. The dielectric permittivity and their anisotropy at various mutual orientation electric (50 Hz) and magnetic field were shown at the different volume concentrations of nanoparticles at room temperature. The linear increase of dielectric constant with volume concentration was confirmed which is in good agreement with the theoretical Maxwell prediction. The dielectric anisotropy factor g(B, ω) is very close to g=1. The values of permittivity increased with the increase of volume fraction of magnetite nanoparticles. The highest value of anisotropy characterized by deviation of permittivity Δε=ε_∥ - ε_⊥ was found for the highest volume concentration which could mean that no aggregation of magnetite nanoparticles had appeared.

DOI: 10.12693/APhysPolA.121.1253
PACS numbers: 47.65.Cb, 77.22.Gm, 77.22.Ch