Synthesis and characterization of surfactant-coated superparamagnetic monodispersed iron oxide nanoparticles

• Synthesis and coating of superparamagnetic monodispersed iron oxide nanoparticles was carried out by chemical solution method. Controlled co-precipitation technique was used to prevent undesirable critical oxidation of Fe2+. The obtained Fe3O4 nanoparticles were coated with sodium oleate. Low-held AC susceptibility and SQUID measurement show superparamagnetism with a blocking temperature around 150K, and almost immeasurable remanence and coercivity.

Nyckelord

nanoparticles

superparamagnetism

surfactant

coprecipitation

ferrofluid

magnetite particles

dispersions

alkaline

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