MSc exam: Formation and Growth of Magnetic ?-Fe2O3 Nanocrystallites under Hydrothermal Conditions
An In and Ex Situ Study
Info about event
1510-213 Aud. VI, Department of Chemistry
Henrik Lyder Andersen is defending his Master thesis: Formation and Growth of Magnetic ?-Fe2O3 Nanocrystallites under Hydrothermal Conditions - An In and Ex Situ Study
Magnetic iron oxide nanoparticles are of key importance in a broad range of scientific and technological applications, including permanent magnets, magnetic fluids, biomedicine, data storage and catalysis.[1-4] The properties of maghemite are highly dependent on particle size, size distribution, morphology, and particle aggregation. The formation and growth of maghemite nanocrystals during the hydrothermal synthesis from aqueous solutions of ammonium iron(III) citrate (C6H8O7·xFe(III)·yNH3) have been studied by in and ex situ powder X-ray diffraction (PXRD). Data analysis by Rietveld refinement and whole powder pattern modelling (WPPM) reveals that the crystallite size and size distributions can be precisely tuned through simple adjustments of the reaction temperature and time.
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External examiner: Senior scientist Poul Norby, Department of Energy Conversion and Storage, Technical University of Denmark
Examiner / Main supervisor: Assistant Professor Mogens Christensen, iNANO and Department of Chemistry, Aarhus University