Abstract
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 Fe 2+. The obtained Fe 3O 4 nanoparticles were coated with sodium oleate. Low-field AC susceptibility and SQUID measurement show superparamagnetism with a blocking temperature around 150 K, and almost immeasurable remanence and coercivity.
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