AP0972 Concentration Dependence of Magnetothermal Response in Fe3O4 Nanofluid

Abstract

In this study, magnetite magnetic nanoparticles (MNPs) were investigated in both low and high concentration ranges to evaluate and optimize the heating efficiency. The Fourier-transform infrared (FTIR) spectroscopy confirmed pure Fe₃O₄ nanoparticles and the x-ray diffraction (XRD) pattern indicated their inverse spinel structure. The mean particle size was calculated using a scanning electron microscopy (SEM) and the hydrodynamic size was determined using dynamic light scattering (DLS). Dipolar interactions that might influence magnetic hyperthermia (MHT) were found by the quantitative study of M-H loops of Fe₃O₄ nanoparticles and analyzed with first order reversal curves (FORC) using a vibrating sample magnetometer (VSM). Calorimetric results exhibited SLP concentration-dependent oscillation behavior. These results of magnetic and calorimetric measurements on Fe₃O₄ nanoparticles and their fluids might be useful to identify the key elements that contribute finding best heating efficiency with lower dosage and consequent toxicity which represents a challenge in using Fe₃O₄ nanoparticles for MHT.