Theses

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A long essay or dissertation or thesis involving personal research, written by postgraduates of University of Ghana for a university degree.

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Author: search.filters.author.Dodoo-Arhin, D.Start date: 2010End date: 2019Subject: search.filters.subject.XRD

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    Fabrication and Characterisation of Ghanaian Bauxite Red Mud-Clay Composite Bricks for Construction Applications
    (American Journal of Materials Science, 2013) Dodoo-Arhin, D.; Konadu, D.S.; Annan, E.; et al.
    The behavior of Ghanaian-based bauxite red mud-Tetegbu clay composites has been investigated for their applicability in the ceramic brick construction industry as a means of recycling bauxite waste. The initial raw samples were characterized by X-ray diffraction (XRD), X-ray Fluorescence spectroscopy (XRF), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (Tg-DTA). The red mud-clay composites have been formulated as 80%-20%, 70%-30%, 60%-40%, 50%-50% and fired at sintering temperatures of 800ºC, 900ºC and 1100ºC. Generally, mechanical strengths (modulus of rupture) increased with higher sintering temperatures. The results obtained for various characterization analyses such as bulk densities of 1.59 g/cm3 and 1.51 g/cm3 compare very well with literature and hold potential in bauxite residue eco-friendly application for low-cost recyclable constructional materials.
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    On the modelling of diffraction line profiles from nanocrystalline materials
    (Solid State Phenomena, 2010) Scardi, P.; Dodoo-Arhin, D.; Leoni, M.
    Recent advances in Line Profile Analysis of powder diffraction patterns must be paralleled by increasing attention to the quality and quantity of experimental data. The analysis of simulated data with different noise levels demonstrates the importance of statistical quality to reveal fine details of interest in the analysis of nanocrystalline materials, like the crystallite shape. It also shows how synchrotron radiation diffraction can improve data quality concerning laboratory measurements, both in terms of statistical quality and in terms of accessible information.