NANO · 2010 · 13 citations · 18 references
Natural SciencesMaterials EngineeringMaterials ScienceMagnetic MaterialsNanomaterialsNanotechnologyInorganic NanoparticlesIron OxidesMagnetic NanomaterialsNanomaterial CharacterizationNanoparticle CharacterizationNanoparticle SynthesisCoercivityDispersibilityIron Oxide NanoparticlesMagnetic CoercivityMagnetic NanoparticlesMagnetic Oxide NanoparticlesMagnetic PropertiesNanoparticles
Pure nano- Fe 3 O 4 and cobalt-doped nano- Fe 3 O 4 particles are successfully synthesized by co-precipitation method using tetramethylammonium hydroxide (TMAOH) as alkali. Several key factors that may affect preparation are carefully discussed such as alkali concentration, alkali dosage, reaction temperature, iron salt solution concentration and dispersant agents. Such nano- Fe 3 O 4 particles prepared have good dispersibility and a very narrow size distribution with the average diameter about 38 nm, which are proved to be cubic spinel Fe 3 O 4 crystal by XRD pattern. It is also found that the addition of PEG-4000 surfactant can improve the dispersibility of nanoparticles. In our work, effects of cobalt dopant concentration on magnetic properties of cobalt-doped nano- Fe 3 O 4 are also discussed. The result shows that the coercivity of cobalt-doped nanoparticles changes greatly with the variation of cobalt dopant concentration. The maximum coercivity reaches as high as 1628 Oe, which is very meaningful for preparation of materials with high coercivity.
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Hydrothermal Synthesis of Monodisperse Magnetite Nanoparticles
T. Jean Daou, G. Pourroy, Sylvie Bégin‐Colin et al. · Chemistry of Materials · 2006 · 640 citations