Size and Shape Controlled Synthesis and Superparamagnetic Properties of Spinel Ferrites Nanocrystals

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dc.contributor.author Song, Qing en_US
dc.date.accessioned 2006-01-19T21:08:16Z
dc.date.available 2006-01-19T21:08:16Z
dc.date.issued 2005-08-26 en_US
dc.identifier.uri http://hdl.handle.net/1853/7645
dc.description.abstract Size and Shape Controlled Synthesis and Superparamagnetic Properties of Spinel Ferrites Nanocrystals Qing Song 216 pages Directed by Dr. Z. John Zhang The correlationship between magnetic properties and magnetic couplings is established through the investigations of various cubic spinel ferrite nanocrystals. The results of this thesis contribute to the knowledge of size and shape controlled synthesis of various spinel ferrites and core shell architectured nanocrystals as well as the nanomagnetism in spinel ferrites by systematically investigating the effects of spin orbital coupling, magnetocrystalline anisotropy, exchange coupling, shape and surface anisotropy upon superparamagnetic properties of spinel ferrite nanocrystals. A general synthetic method is developed for size and shape control of metal oxide nanocrystals. The size and shape dependent superparamagnetic properties are discussed. The relationship between spin orbital coupling and magnetocrystalline anisotropy is studied comparatively on variable sizes of spherical CoFe2O4 and Fe3O4 nanocrystals. It also addresses the effect of exchange coupling between magnetic hard phase and soft phase upon magnetic properties in core shell structured spinel ferrite nanocrystals. The role of anisotropic shapes of nanocrystals upon self assembled orientation ordered superstructures are investigated. The effect of thermal stability of molecular precursors upon size controlled synthesis of MnFe2O4 nanocrystals and the size dependent superparamagnetic properties are described. en_US
dc.format.extent 15014896 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.publisher Georgia Institute of Technology en_US
dc.subject Spinel ferrite en_US
dc.subject Superparamagnetism
dc.subject Synthesis
dc.subject Nanocrystals
dc.subject Size and shape control
dc.subject Superlattices
dc.subject Superstructures
dc.subject.lcsh Spinel group Magnetic properties en_US
dc.subject.lcsh Ferrites (Magnetic materials) en_US
dc.subject.lcsh Ferromagnetism en_US
dc.subject.lcsh Nanocrystals en_US
dc.subject.lcsh Nanoparticles Magnetic properties en_US
dc.title Size and Shape Controlled Synthesis and Superparamagnetic Properties of Spinel Ferrites Nanocrystals en_US
dc.type Dissertation en_US
dc.description.degree Ph.D. en_US
dc.contributor.department Chemistry and Biochemistry en_US
dc.description.advisor Committee Chair: Zhang, John; Committee Member: Barefield, Kent; Committee Member: El-Sayed, Mostafa; Committee Member: Wang, ZhongLin; Committee Member: Wilkinson, Angus en_US


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