The Influence of Synthesis Parameters on Structural and Magnetic Properties of Iron Oxide Nanomaterials
| Autor: | Victor Kuncser, Ioan Albert Tudor, Nicusor Iacob, Roxana Mioara Piticescu, Laura Madalina Cursaru, Dumitru Valentin Dragut, Florentin Stoiciu |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
General Chemical Engineering Iron oxide Analytical chemistry 02 engineering and technology 010402 general chemistry 01 natural sciences Article thermal stability lcsh:Chemistry chemistry.chemical_compound Magnetization Phase (matter) General Materials Science Thermal analysis Saturation (magnetic) Magnetite nanotechnology iron oxide nanoparticles Coercivity equipment and supplies 021001 nanoscience & nanotechnology 0104 chemical sciences hydrothermal synthesis high pressure Magnetic hyperthermia chemistry lcsh:QD1-999 magnetic properties 0210 nano-technology human activities Iron oxide nanoparticles |
| Zdroj: | Nanomaterials, Vol 10, Iss 1, p 85 (2020) Nanomaterials Volume 10 Issue 1 |
| Popis: | Magnetic iron oxides have been used in biomedical applications, such as contrast agents for magnetic resonance imaging, carriers for controlled drug delivery and immunoassays, or magnetic hyperthermia for the past 40 years. Our aim is to investigate the effect of pressure and temperature on the structural, thermal, and magnetic properties of iron oxides prepared by hydrothermal synthesis at temperatures of 100&ndash 200 ° C and pressures of 20&ndash 1000 bar. It has been found that pressure influences the type of iron oxide crystalline phase. Thus, the results obtained by Mö ssbauer characterization are in excellent agreement with X-ray diffraction and optical microscopy characterization, showing that, for lower pressure values (< 100 bar), hematite is formed, while, at pressures > 100 bar, the major crystalline phase is goethite. In addition, thermal analysis results are consistent with particle size analysis by X-ray diffraction, confirming the crystallization of the synthesized iron oxides. One order of magnitude higher magnetization has been obtained for sample synthesized at 1000 bar. The same sample provides after annealing treatment, the highest amount of good quality magnetite leading to a magnetization at saturation of 30 emu/g and a coercive field of 1000 Oe at 10 K and 450 Oe at 300 K, convenient for various applications. |
| Databáze: | OpenAIRE |
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