Synthesis of Fe2O3 nanoparticles in different reaction media

Controllable synthesis and magnetic properties of pure hematite and maghemite nanocrystals from a molecular precursor

“…It was previously reported that Fe 2 O 3 always crystallizes into the metastable ␥-Fe 2 O 3 at low temperatures, and ␥-Fe 2 O 3 will transform to the stable ␣-Fe 2 O 3 in the temperature range of 350-600 • C (The phase transition temperature of ␥-Fe 2 O 3 to ␣-Fe 2 O 3 is relative to the structural defects, crystallinity, particle size, surface area and preparation method, etc.) under normal pressure [6,7] or at room temperature under a pressure of 35 GPa [8]. The successful synthesis of ␣-Fe 2 O 3 via hydrothermal processing of the Fe-(ACAC) 3 at a much lower temperature than that needed by thermolysis in air of the same precursor, was likely due to the high pressure and liquid phase hydrothermal environments.…”

“…Zhang). homogeneity, composition, phase and microstructure of the resultant products [6,7,[22][23][24]. By choosing a proper metallorganic molecular precursor, coupled with a rational calcining procedure or other thermolysis processes such as solvothermal treatment [6,7], nanocrystalline products could be obtained usually under the conditions significantly milder than those employed in the conventional solid-state synthesis.…”

“…By choosing a proper metallorganic molecular precursor, coupled with a rational calcining procedure or other thermolysis processes such as solvothermal treatment [6,7], nanocrystalline products could be obtained usually under the conditions significantly milder than those employed in the conventional solid-state synthesis. Because of its low cost, easy preparation and mild decomposition, Fe-(ACAC) 3 has already been employed as an ideal precursor for preparing nanoparticles or thin films of iron oxides [6,7,[22][23][24][25]. However, the existing synthesis methods with Fe-(ACAC) 3 as a precursor were not exempt of some drawbacks.…”

“…However, the existing synthesis methods with Fe-(ACAC) 3 as a precursor were not exempt of some drawbacks. For instance, the use of massive amounts of surfactants as well as toxic and expensive organic solvents may cause some environmental problems [6,7,[22][23][24]; furthermore, the resultant nanoparticles were often coated with large quantities of organic molecules [22,23] or composed of mixed phases [24], which would limit their practical applications.…”

Morphological studies of randomized dispersion magnetite nanoclusters coated with silica

“…There are a number of synthetic methods being utilized to produce nanoscaled magnetite particles like, organo-metallic thermal decomposition [1], microemulsion [2], hydrothermal [3], solvothermal [4], and coprecipitation [5,6]. The latter is the most commonly used method, mainly attributed to its simple and easy processing operation, high yield of products with superior crystallinity and magnetic behaviours and it involves only the utilization of nonorganic based reactants.…”