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Nanocrystals, core-shells, and nanocapsules of iron oxide

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Description: In this thesis, the synthetic parameters of iron oxide were investigated. The synthesis was performed using octyl ether or dodecane as solvent, myristic, oleic, lauric, or stearic acid were used as surfactants, in varying concentrations, and the temperature of the reaction was performed at either 200 or 270°C. It was shown that by altering the synthetic conditions, it was possible to form maghemite particles of various shapes. Under some conditions, the formation of nanocapsules and core-shell particles were observed. While the identity of the fatty acid surfactant was shown to have little effect on particle formation, concentration was a major factor. Small nonuniform particles were formed at low concentrations, but larger, monodisperse particles were formed at higher concentrations. At lower temperatures, particle formation was hindered and it was necessary to use lower concentrations of surfactant. The solvent had no discernable effect on particle formation. Particles were analyzed using electron microscopy, infrared spectroscopy, thermal gravimetric analysis, selected area electron diffraction, and UV-Vis spectroscopy.
Language: English
Format: Degree Work