Comparative Study of Dielectric Properties and Other Physical Properties of Superparamagnetic Iron Oxide Nanoparticles and Polyethylene Nanocomposites

The present paper proposes a new investigation of the dielectric properties of superparamagnetic iron oxide nanoparticles (SPIONs)/PE nanocomposites in comparison with the neat polymer at different temperatures. The SPIONs used were without or with positively or negatively surface charge. Different frequency-domain dielectric responses were observed for the different samples. The usual decrease of the values of the real part of the permittivity of all the three SPIONs nanocomposites in the range was observed with the increase of temperature. Moreover, the values of the real part of the permittivity of PE-bare SPIONs increased slightly at lower frequencies, whereas those of PE-positively charged SPIONs and PE-negatively charged SPIONs were constant at higher frequencies and showed an increase at medium frequencies and a plateau at lower frequencies. The imaginary part of their permittivity also showed dielectric responses for the samples.