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Simple Hydrothermal Synthesis and Morphological Study of Magnetic Nanoparticles

Md. Shariful Islam, Alam Khan, G.M. Shafiur Rahman, Hrithita Aftab, Yoshifumi Kusumoto


Magnetite (Fe3O4) nanoparticles were synthesized using FeCl3•6H2O or FeCl2•4H2O with 5 or 8 mmol concentration and 3 or 5 h incubation time with the constant pH (7.5) by simple hydrothermal decomposition and then transferred them into maghemite (γ-Fe2O3) and hematite (α-Fe2O3). Precisely, the objectives of the study were to evaluate the influences of salt type, its concentration and incubation time on the morphology of the as-synthesized magnetic nanoparticles. Synthesized nanoparticles were characterized by means of XRD, FE-SEM, TEM, UV-Vis absorption (reflectance) spectra and magnetic hysteresis loops by superconducting quantum interference device (SQUID), without any size sorting. In case of iron hexahydrate (FeCl3•6H2O), 5 mmol salt concentration along with 5 h incubation period results in homogeneous spherical-shaped particles. On the other hand, the same salt but 8 mmol concentration and 3 h incubation period produced heterogeneous spherical-shaped particles with bigger particle sizes. In case of iron tetrahydrate (FeCl2•4H2O) almost neck-structured heterogeneous particles were obtained by using both types of salt concentrations and incubation period (5 or 8 mmol and 5 or 3 h). Finally, our study revealed that in both type of salts, increased concentration and decreased incubation period result in increased particles size.
Keywords: Magnetic materials, Spherical-shaped, Neck-structured, Hysteresis loops, Salt, Hyperthermia

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