Dielectric Response at Different Nanoparticle Concentrations for GTL Oil-based Magnetic Nanofluids

Mineral oil, a petroleum product, has been utilized as transformer oil for over a century.The advent of novel technologies in gas processing, has engendered novel opportunities in liquid insulations.Gas-to-liquid (GTL) processing offers a stable insulating liquid suitable for use in transformers.The present work focuses on studying of the dielectric properties of magnetic nanofluids where GTL oil is the carrier fluid.Samples of nanofluids with different concentrations of iron oxide nanoparticles have been produced.Frequencyand time-dependent spectroscopic methods were utilized as observational tools.The polarization and depolarization current (PDC) method was used to study the dielectric properties when applying a direct current (DC) electric field with an intensity of 0.1 kV/mm and 1 kV/mm, respectively.The results obtained from this study demonstrated an apparent enhancement in conduction current values and a temporal variation in absorption current with an increase in nanoparticle concentration.In the case of frequency-dependent spectroscopy, changes in relaxation processes were observed and changes in material polarization due to increased nanoparticle concentration were determined.The dielectric method employed the real and imaginary parts of the dielectric modulus, to express the polarization behavior.