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Showing 1 to 20 of 21 for “"F200 - Materials science"”.
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Particulate dispersions for magnetic recording data
The study of a magnetic recording media dispersion has been carried out using hindered settling analysis, the purpose of which was to probe the equilibrium state structure in zero applied magnetic field. The system chosen for the main study was based on a commercial formulation of a y-Fe 203 …
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The effects of small molecules and polymer on the phase behaviour of C16EO16 - water mixture
The effect of adding a third component, oils (1-hexene, n-decane, 1-decene) or water soluble protein (lysozyme) on the lyotropic liquid crystalline phase behaviour of hexaethylene glycol n-hexadecyl ether (C16E06) and water ( 2H20) mixtures has been investigated. A combination of optical microscopy …
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Synthesis and electrochemistry of photoantimicrobial agents based on the azine chromophore
Photodynamic Therapy (PDT) is a ôancer treatment involving selective retention of a photoactive drug in tumour cells and tissue. Subsequent illumination with light of the correct wavelength can result in tumour destruction, generally assumed to be mediated by singlet oxygen ( 102) generated by the …
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Heterogenous catalysis of inorganic reactions
Aluminosilicates, especially zeolite A, Surrey powder and alumina, are efficient and mild catalysts for ligand substitution reactions of inert Cr(" and Co(ffl) complexes. The reaction kinetics for the aquation of chromium(1H) chloride and chromium(llI) bromide hexahydrates, the anation reaction of …
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Templating of Metal Oxide and Oxhydroxides Nanoparticles in Surfactant Media
… of these polyethylene oxide non-ionic surfactant materials was examined against the different conditions that can be used for the synthesis of 13- & a-FeOOH such as pH, ionic species, Fe" and Fe" ions. The addition of Cr, NO3, S042, and P043 anions and Nat, C2t Mg2 and Cr3 cations induced a …
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The electrochemistry of phenothiazine derivatives
Methylene blue derivatives (MBDs) such as methylene blue (MB -), 1-methyl methylene blue (1MMB) and 1,9-dimethyl-methylene blue (DMMB) have potential use as drugs within photodynamic therapy (PDT). Knowing the redox properties of MBDs will help in understanding the way in which MBDs interact with a …
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Study of porous magnetic nanocomposites for bio-catalysis and drug delivery
… reagents within biocompatible nanocomposite materials. The targeted stimuli triggered drug release restrict the toxic drugs to the tumour site, thereby reducing the effects of “free drug” on healthy tissues. One of the most versatile and safe materials used in medicine are iron oxide …
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Magnetic noise studies in advanced metal particle tapes
The aim of this research was to achieve two objectives: assembly of magnetisation profiles and noise studies on flexible media. Magnetic profiles of the media were established using anhysteretic techniques derived from Alternating Current (AC) bias analogue recording. The intention of this …
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Friedel-crafts acylation reactions using heterogeneous catalysts stimulated by microwave radiation
Ion exchanged zeolites, ion exchanged clays, sulphated zirconia and silica supported phosphotungstic acid were prepared. Characterisation of the catalysts using pyridine adsorption revealed the catalysts contained both Brønsted and Lewis acid sites. When the catalytic activities for the acylation …
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A study of the effect of anaesthetic molecules on model membranes formed in surfactant / water mixtures
This work studies the effect of a range of general and local anaesthetics on model membranes, aiming to establish if the addition of anaesthetic promotes changes in the membranes interfacial region or within their internal structure. The models used for biological membranes were simple …
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Anisotropy and texture studies in magnetic media
The rapid development of magnetic materials for recording media applications increased the demands for new and more precise experimental investigation techniques. In respect with these demands, this project is focused on experimental analyses of advanced particulate media and magnetic thin film …
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Three-dimensional modelling of metal evaporated tape
As developments in magnetic recording increase, the demands for high density recording media continue to rise. One particular medium developed towards meeting these needs is the commercially successftil metal evaporated (ME) tape. To provide a deeper understanding of the magnetic processes …
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Production of nano-templated surfaces for quartz crystal microbalance
This thesis attempted to follow the "true Liquid crystalline templating" route using high concentrations of non-ionic surfactant in the liquid crystal matrix in order to fabricate a high surface area silver electrode onto the gold electrode substrate of an Electrochemical Quartz Crystal …
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Synthesis and properties of potentially liquid crystalline phosphorus compounds
Traditionally it was considered necessary for molecules to be either rod or disc shaped to full] the requirements necessary for liquid crystalline phase formation. However, recent moves away from these traditional theories have led to the discovery of molecules possessing geometries such as …
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UV-initiated synthesis of novel urethane polymers
The Barton reaction involves the photoinitiated rearrangement of nitrite esters and is used primarily in the synthesis of complex steroidal structures. The rearrangement results in the introduction of active hydrogen atoms into the molecule and a novel use of this reaction for the production of …
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The micro-optical ring electrode: Development of a novel thin ring based device for spectrophotoelectrochemistry and its application to the study of rose bengal
Electrochemists have at their disposal, for the study of photo- electrochemical systems, a range of sensors and devices such as rotating optical disc ring electrodes, optically transparent electrodes and optically transparent thin layer electrodes. A microelectrode is an electrode with at least one …
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Ion diffusion from Sellafield OPC paste formulations
The disposal of nuclear waste is highly regulated and the disposal option will be dependent on the radionuclide content of the waste. The encapsulation of nuclear waste to prevent migration of radionuclides into the environment and as a safe means of long term storage and disposal can be achieved …
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Ion-exchange studies of yttrium doped zirconium phosphates for use in the remediation of nuclear waste
… to be preferred to the conventional ion-exchange materials due to their increased stability under acid conditions. The ability of the material to withstand low pH is crucial as the legacy waste pools have very low pH. It has been well documented that substituting metals with different radii into …
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The preparation and characterisation of highly selective adsorbents for fission product removal from acid solutions
Nuclear fuel reprocessing of fissile materials is carried out in order to provide recycled fuel for existing and future nuclear power plants. One aim of reprocessing is to recover unused uranium (U-238 and U-235) and plutonium isotopes thereby preventing them from being wasted. This can save up to …
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The Development of an Integrated Microengineered Ion Sensor (Inion) for Cesium
An Ion Selective Conductimetic Microsensor (ISCOM) for the detection of cesium ions was devleoped. The operating principle of an ISCOM is based on the concentration dependant change in the bulk conductivity of an ion selective membrane. Changes in conductivity are achieved by salt extraction of the …
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