Effect of reaction protocol on the nature and size of iron oxide nano particles obtained through solventless synthesis using iron(II)acetate: structural, magnetic and morphological studies

Abstract

Magnetite and hematite nanoparticles (~ 20 nm size) have been synthesized by solventless thermal decomposition of iron(II)acetate in air under different reaction protocols. The structure of the decomposed materials is investigated by FT-IR and powder XRD, while the morphology of the particles formed was studied by SEM/TEM. The magnetic phases of the materials are quantitatively identified by 57 Fe Mӧssbauer spectroscopy. EDX was used for elemental analysis. The results obtained from FT-IR, XRD and Mӧssbauer studies explicitly establish that the materials obtained are iron oxides (magnetite and hematite). The study shows a reaction time-and temperature-dependent conversion of magnetite to hematite. The underlying solid state reactions have been discussed. The present study comes across that a single organo-iron precursor can provide different pure phases of iron oxide nanoparticles depending on the reaction protocol.

Mixed Maghemite/Hematite Iron Oxide Nanoparticles Synthesis for Lead and Arsenic Removal from Aqueous Solution

“…It was demonstrated that the removal of heavy metal depends also on the size of iron oxide particles [20]. The amount of heavy metal adsorption removal increased with decreasing particle size due to less aggregation and more sites exposed to adsorption [20]. We observed in TEM the smallest particles in IO-Na, less aggregation than IO-NH, IO-K samples in agreement with its high adsorption capacity.…”

“…As shown in Figure 3, the surface area of IO-Na is high comparatively to IO-NH and IO-K samples. It was demonstrated that the removal of heavy metal depends also on the size of iron oxide particles [20]. The amount of heavy metal adsorption removal increased with decreasing particle size due to less aggregation and more sites exposed to adsorption [20].…”

A direct laser-synthesized magnetic metamaterial for low-frequency wideband passive microwave absorption

“…The binding energy of the O 1s peak for Fe 3 O 4 is commonly at 530 eV, as illustrated in figure 5(b 2 ), and that for Fe 2 O 3 was at approximately 527 eV [34]. Moreover, the high reaction kinetics, due to the longer reaction time and higher temperature, caused an increase in the size of the nanoparticles [35]. The fast laser processing speed with controlled thermal effects realized by selecting an appropriate laser power and repetition rate can generate nanoparticles of a specific size from a liquid precursor and effectively minimise overtreatment to avoid thermal damage to both the coating and substrate.…”