Surfactant-free synthesis and magnetic hyperthermia investigation of iron oxide (Fe3O4) nanoparticles at different reaction temperatures

AuthorsAhmad RezaYasemiana, Mohammad Almasi Kashi, Abdolali Ramazani
JournalMaterials Chemistry and Physics
Presented byدانشگاه کاشان
Page number9
Volume number230
Paper TypeFull Paper
Published AtMarch 2019
Journal GradeISI
Journal TypeTypographic
Journal CountrySwitzerland
Journal IndexISI

Abstract

The effect of reaction temperature (TR, ranging from 40 °C to 80 °C) on magnetic hyperthermia measurements
was investigated in the surfactant-free co-precipitation synthesis of magnetite (Fe3O4) nanoparticles (NPs). The
size, structure and magnetic properties of the synthesized NPs were studied by X-ray diffraction, field-emission
scanning electron microscopy (together with energy dispersive spectroscopy), hysteresis loop and first-order
reversal curve analyses. The investigations showed that all the NP samples were single domain with a superparamagnetic
(SP) feature. After preparing the respective ferrofluids with a concentration of 5 mg/ml (in distilled
water medium) acting as nanoheaters, hyperthermia measurements were performed under an alternating
magnetic field with a frequency of 400 kHz. It was found that TR=60 °C resulted in the maximum specific loss
power (SLP) value of 181 W/g together with an SP fraction of 82%, being a suitable candidate for use in
magnetic hyperthermia. In this case, the resulting saturation magnetization and SP fraction were in the middle of
corresponding values obtained from TR=40 °C and 80 °C. Our results showed that a balance between relatively
high saturation magnetization and low coercive field led to the maximum SLP.