Application of Radial Distribution Functions to Diffraction and Imaging Data: Interfacial Structures, Amorphous, Disordered Materials
University of Cambridge
Doctor of Philosophy (PhD)
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Mukaddem, K. T. (2020). Application of Radial Distribution Functions to Diffraction and Imaging Data: Interfacial Structures, Amorphous, Disordered Materials (Doctoral thesis). https://doi.org/10.17863/CAM.51543
The central theme of this thesis is the application of radial and pair distribution function analysis to materials characterisation problems for nanotechnology. These concepts are introduced in Chapter 1, and the associated methods are described in Chapter 2. Chapter 3 details the first of the results which discusses the design and development of a software tool called ImageDataExtractor. This auto-extracts microscopy images and then analyses them to afford quantitative information regarding particles in a sample, such as shape, size and distribution. It realises an opportunity for data-mining the ubiquity of readily available images in the literature. Chapter 4 presents results of the development and execution of a novel experimental technique, called glancing-angle pair distribution function (gaPDF) analysis, applied to the structure of the working electrode in dye-sensitised solar cells (DSSCs). This structure was successfully observed, validating this novel method. The investigation also suggested preferred binding modes of the carboxylic acid anchoring groups present in this interfacial structure. Chapters 5 and 6 demonstrate the application of PDF analysis to synchrotron-based powder diffraction data of two material case studies: the rare earth phosphate glass (REPG) (Gd2O3)0.230(P2O5)0.770, and four Ru based photo-isomers. The closest R…R rare earth separation, which governs optical properties of REPGs, was determined to be 4.2(1) Å, aided by various statistical techniques. Analysis on four Ru-based photo-isomers confirmed: the existence of local structure in such compounds, their ability to be photo-isomerised in powder form, the theoretical models constructed using computational techniques, and the lack of heterogeneity in photo-isomerisation throughout a given light-induced sample. Chapter 7 concludes the work and offers a future outlook.
radial distribution function, materials, imaging, pair distribution function, synchrotron, diffraction
This record's DOI: https://doi.org/10.17863/CAM.51543
Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0), Prior to the publication of this thesis, the contents of Chapter 3 were published in the Journal of Chemical Information and Modeling. In addition to written permission from the editor, a citation and link were provided on page 25 to comply with the copyright policies of the publisher provided online. Additionally, the contents of Chapter 5 were published in Physical Review Materials. A citation is provided on page 91, nothing further was required to comply with the copyright policies of the publisher provided online.
Licence URL: https://creativecommons.org/licenses/by-nc-nd/4.0/