Bioinspire Low Temperature Synthesis of Superparamagnetic Fe_3O_4 Morphologies Tuned Using Gum Arabic as Crystal Growth Modifier

摘要

Several strategies have been established for the synthesis of magnetic nanoparticles with tunable sizes, morphologies and magnetic properties. Most of these reports are based on synthesis of magnetic nanoparticles that involve use of environmentally vicious organic solvents and high temperature conditions. We present a facile, rapid, low temperature approach to synthesize crystalline Fe_3O_4 superstructures with high magnetic properties via a microwave-assisted sonochemical method and studied the effects of gum arabic (GA) as crystal growth modifier in the evolution of Fe_3O_4 morphology. We observed that the tansmission electron microscopy (TEM) investigations for GA as crystal growth modifier resulted in primary nanocrystal of cubic like morphologies. The as-synthesized Fe_3O_4 exhibit superparamagnetic properties with high saturation magnetization, 78.03 emu/g and have no residual magnetism. The Brunauer-Emmett-Teller (BET) analysis showed single point surface area of 84.9098 m~2/g, BET surface area of 87.2872 m~2/g and Langmuir Surface Area of 142.4986 m~2/g. Magnetite nanoparticles with high saturation magnetization are required for enhanced MRI detection, cancer treatment (magnetic hyperthermia).