Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 104 for “"characterisation techniques"”.
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Operando characterisation techniques for graphene-based lithium-sulfur batteries
Lithium-sulfur (Li-S) batteries have the potential to enable high-gravimetric capacity, low-cost energy storage, but their widespread implementation is presently limited by their rapid capacity degradation due to irreversible loss of electrical connectivity with their active material. Electrically …
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FUNCTIONAL THIN FILMS BY SPATIAL ATOMIC LAYER DEPOSITION FOR PHOTOVOLTAIC APPLICATIONS
… a series of electrical, optical and structural characterisation techniques. Finally, the application of these films in homojunction and heterojunction crystalline silicon wafer solar cells is also presented.
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Stresses and strain in silicon: 3-dimensional analytical capabilities for the non-invasive evaluation of strain fields in Si wafers and packaged chips
… In this context this thesis proposes novel techniques for the in situ imaging of strain and internal damage in processed Si wafers and packaged Si chips. X-Ray Diffraction Imaging (XRDI) is a powerful, non-destructive technique for the imaging of strain in crystalline materials. …
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Characterising water treatment works performance using fluorescence spectroscopy
… implies the utilization of advanced analytical techniques for its characterisation and assessment of removal efficiency. Here, the application of simple fluorescence excitation-emission (EEM) spectroscopy to OM characterisation in drinking water treatment was presented. Monthly raw and clarified …
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Novel approaches for the characterisation of spinodal alloys
… alloy microstructures, the use of advanced characterisation techniques is critical. Conventional microscopy and diffraction‑based methods often provide valuable insights. However, the former are often too localised, while the latter tend to lack the necessary resolution to distinguish …
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SiC and B₄C as electrocatalyst support materials for low temperature fuel cells
… degradation studies as well as advanced characterisation techniques were used to clarify the structure-property relationships between catalyst morphology, metal-support interaction, ORR activity and surface adsorption onto the Pt nanoparticles. Extended X-ray Absorption Fine Structure …
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Coaxial Electrospinning of Synthetic/Natural Polymer Combinations for Controlled Release of Active Components in Biomedical Applications
… project aims to advance coaxial electrospinning techniques for polymer/protein systems, targeting tissue engineering and drug delivery applications. While electrospinning is increasingly utilised in tissue engineering, challenges arise when incorporating active pharmaceutical ingredients due to …
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Clathration by diol hosts : thermodynamics and structure
… common organic solvents as the guests. Various characterisation techniques were used and the crystal structures of the inclusion compounds and of the a-phases of Hosts 2 and 5 were elucidated using single crystal X-ray diffraction methods. Thermal decomposition studies using thermogravimetry and …
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Phase and structural changes of nickel catalysts as a function of reaction conditions
… in the presence of steam using in situ magnetic techniques to identify the loss of metallic Ni. As this oxidation is thought to be a size dependent effect, a set of catalysts with narrow crystallite size distributions and tuneable size is required for the experimental testing. The use of …
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Stability Investigation of Silicon Nanowire Solar Cells
… cells. Then it describes the fabrication and characterisation techniques used in developing solar cells' nanowire active layer used here. The metal insulator semiconductor structure in which the semiconductor is made of Silicon nanostructures is used in this work to study and investigate the …
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Synthesis and Fabrication of Alpha Phase Iron Oxide (α-Fe2O3) Nanostructured doped with Ruthenium for Highly Sensitive and Selective Flammable and Toxic Gas Sensor
… of ruthenium. The samples underwent some characterisation techniques, such as X-ray diffractometry, thermogravimetric analysis, x-ray photoelectron spectroscopy, Brunauer-emmett-teller surface area analysis, scanning electron microscopy, and high-resolution transmission electron …
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Effect of Moiety Choice on Structural and Electrical Properties in Organic Semiconductors
… University of Cambridge. It includes detailed characterisation of two groups of novel polymer semiconductors, one based on fluorinated variants of polyalkylthiophenes and the other on a series of copolymers based on a fused poly-dithieno-thiophene-benzene core. In both cases the goal is to …
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Supramolecular derivatives of selected bioactive compounds : a physicochemical study
… cyclodextrins. Co-precipitation and kneading techniques were employed in attempts to produce inclusion complexes. An inclusion complex of 2ME was isolated with each of the following: -CD, HPBCD, RAMEB, DIMEB and TRIMEB. Co-crystallisation of nevirapine was attempted using twelve potential …
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Fabrication and applications of lead-silicate glass holey fibre for 1-1.5 microns: nonlinearity and dispersion trade offs
… with the development of the novel fabrication techniques, the characterisation and applications of these fibres are presented, proving the advantages of HF technology in the implementation of highly nonlinear optical devices, as well as discussing their limitations.<br/><br/>At the time of this …
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Surface and interface characterisation of high-k dielectric materials on silicon and III-V semiconductor substrates
… This thesis investigates the deposition and characterisation of a range of candidate high-k materials on both silicon and III-V (InGaAs and InP) semiconductor substrates, with the focus on interface formation.The primary characterisation techniques used to study the interface chemistry were …
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Influence of Mechanical Loading and Temperature on the Magnetic Properties of FeCo-2V Soft Magnetic Alloy
… during service. By integrating advanced characterisation techniques, including in situ Digital Image Correlation (DIC), Electron Backscatter Diffraction (EBSD), synchrotron X-ray diffraction, Single Sheet Tester (SST) measurements, and magnetic loss analysis, this work offers a multiscale …
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Investigation of a solvent-free continuous process to produce pharmaceutical co-crystals. Understanding and developing solvent-free continuous cocrystallisation (SFCC) through study of co-crystal formation under the application of heat, model shear and twin screw extrusion, including development of a near infrared spectroscopy partial least squares quantification method
… successfully manufactured using the SFCC method. Characterisation techniques were important for this project, and NIR spectroscopy proved to be a convenient, accurate analytical technique for identifying the formation of co-crystals along the extruder barrel. Separate thermal and model shear …
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Quantifying radiation damage through stored energy released during defect annealing in metals
… this is hindered by limitations of the chosen characterisation technique. For example, transmission electron microscopy (TEM) is unable to detect the smallest and most numerous defects in irradiated metals. Instead of spatial characterisation, defects can be detected and quantified through …
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The application of time encoded signals to automated machine condition classification using neural networks
… data and simple time domain signal shape characterisation techniques allied to a basic feedforward multi-layer perceptron neural network. A novel extension to the signal coding scheme (TES), involving the application of energy based shape descriptors, was developed. This sought …
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Development of Methods to Predict and Enhance the Physical Stability of Hot Melt Extruded Solid Dispersions
… solid dispersions. A series of physicochemical characterisation techniques including MTDSC, PXRD, SEM, ATR-FTIR and AFM-LTA were used to evaluate the systems. Physical characterisation of the model drugs and polymers, prediction of drug-polymer miscibility and solubility and real-time physical …
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