The formation mechanism of iron oxide nanoparticles within the microwave-assisted solvothermal synthesis and its correlation with the structural and magnetic properties

Abstract

Magnetic nanoparticles based on Fe3O4 were prepared by a facile and rapid one-pot solvothermal synthesis using FeCl3·6H2O as a source of iron ions, ethylene glycol as a solvent and NH4Ac, (NH4)2CO3, NH4HCO3 or aqueous NH3 as precipitating and nucleating agents. In contrast to previous reports we reduce the synthesis time to 30 minutes using a pressurized microwave reactor without the requirement of further post-treatments such as calcination. Dramatically reduced synthesis time prevents particle growth via Ostwald ripening thus the obtained particles have dimensions in the range of 20 to 130 nm, they are uniform in shape and exhibit magnetic properties with saturation magnetization ranging from 8 to 76 emu g(-1). The suggested method allows simple particle size and crystallinity tuning resulting in improved magnetic properties by changing the synthesis parameters, i.e. temperature and nucleating agents. Moreover, efficiency of conversion of raw material into the product is almost 100%.

The Investigation into the Toxic Potential of Iron Oxide Nanoparticles Utilizing Rat Pheochromocytoma and Human Neural Stem Cells

“…The reaction mixture is placed within an autoclave vessel and nanocrystals form as the vessel is heated to 200 °C and kept constant for 24 h [38]. This process produces iron oxide (magnetite) nanoparticles through the following series of reactions (Scheme 1) [39]:…”

Electrochemical Monitoring of Methotrexate Anticancer Drug in Human Blood Serum by Using in situ Solvothermal Synthesized Fe3O4/ITO Electrode

“…Stoichiometric amounts of FeCl 3 ⋅ 6H 2 O (20 mmol), FeSO 4 ⋅ 7H 2 O (10 mmol) and 4.8 gm of urea (30 mmol) were dissolved in 50 mL DIW, then heated the reaction mixture in the microwave at 700 power and 160 °C for 1 h . The reaction mixture was cooled to room temperature and the formed precipitates were separated by centrifuge, washed with DIW and ethanol then dried it in an oven at 80 °C.…”

Synthesis, Functionalization, and Design of Magnetic Nanoparticles for Theranostic Applications

“…[151] Since microwave assisted technique is mostly combined by thermal decomposition, we have categorized this method as a non-hydrolytic approach. However, hydrolytic approaches such as hydrothermal, [152] sol-gel [153] can also be accelerated upon utilizing microwaves. This method [154] In a recent study, FITC-dextran coated iron oxide nanoparticles were synthesized by the hydrazine mediated reduction of iron (III) chloride salts in the presence of dextran under continuous stirring and microwave irradiation.…”