Abstract
This chapter presents the results of investigation the magnetic, optical, semiconductor, and photoinduced super paramagnetic properties of ultrafine γ-Fe2O3 nanoparticles (NPs) encapsulated into liquid-crystalline, second-generation poly(propylene imine) dendrimer. The chapter starts by presenting the promising applications of iron oxide NPs that ranging from high-density information storage to magnetic resonance imaging contrast agents. Then it describes and discusses the unique properties of nanoparticles: superparamagnetic behavior, blocking temperature, enhanced magnetic anisotropy, core/shell structure of nanoparticles, where Fe3+ atoms exhibit low-spin properties in the surface monoatomic layer of the high-spin shell, the quantum size effect in optical absorption, the ability to manipulate the superparamagnetic properties of NPs under irradiation, and the possibility to consider NPs as a quantum objects. At the end of the chapter, the main results are summarized.
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