Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760459
Title: Synthesis of dispersible nanostructures using anti-sintering cast materials
Author: Fletcher, Dean
ISNI:       0000 0004 7432 4497
Awarding Body: University of Birmingham
Current Institution: University of Birmingham
Date of Award: 2018
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Abstract:
At the elevated temperatures required for metal carbide synthesis, atomic diffusion across particle boundaries can occur, resulting in the fusion of smaller particles into larger ones. This process is termed sintering. By providing a physical barrier for the inhibition of sintering, in the form of easily removable alkaline earth metal oxide “cast materials”, this thesis shows that Prussian Blue nanoparticles can undergo thermal decomposition to produce discrete Fe3C nanoparticles. The overarching aim of this work is to push the boundaries of metal carbide synthesis by forming the basis of a technique that can eventually be applied to the synthesis of a wide range of discrete metal carbide nanostructures. A combination of energy dispersive X-ray analysis and electron tomography provides evidence of efficient dispersal of Fe3C nanoparticles throughout various cast materials and ample evidence of < 100 nm Fe3C particle diameters. Scanning electron microscopy provides evidence of the ability to disperse these particles over a catalyst support, and superconducting quantum interference device measurements show superparamagnetic behaviour for the Fe3C particles. The technique is then extended to larger size regimes in the biotemplating of carbonised microcoils using the algae species spirulina.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.760459  DOI: Not available
Keywords: QD Chemistry
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