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.
Results
Showing 1 to 20 of 305 for “"QD Chemistry"”.
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Development of new steam methane reforming mobile plant with micro-scale catalytic channels
The search for clean alternative energy sources is vital to feed the ever-increasing world energy consumption. It is widely accepted that hydrogen is the cleanest and abundant energy source of the future. Currently, more than 90% of world hydrogen production is made via catalytic steam methane …
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Study on the application of ionic liquids in bio-based lubricant for a sustainable machining process
Many factors tend to influence the increased demand in recent years, including stateof- the-art of effective and environmentally friendly metalworking fluids (MWFs). Bio-based lubricants from vegetable oils are highly biodegradable, non-toxic, pose good lubricating properties and low production …
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Thermal radiation and slip effects on mhd stagnation point flow of nanofluid over a shrinking sheet
This study is conducted to analyze the effects of thermal radiation and slip effects on magnetohydrodynamic stagnation point flow over a shrinking sheet. The velocity, temperature, and nanoparticles concentration profiles are analyzed with respect to the involved parameters such as Lewis number, …
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Coagulation and flocculation process using cassava peel starch modified with lemongrass extract for pollutants removal in raw water
Sustainable and greener solution for water treatment problems is the persistent need in the current days. The present research synthesized a novel dual function coagulant using cassava peel starch with incorporation of lemongrass extract and evaluated the synergistic effect between alum and …
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The development and optimisation of novel flow injection analysis methods for GSK
… named ChemoAc (chemometrics in analytical chemistry). In these joint publications the original GSK methods were externally subjected to DOE optimisation and advanced chemometric techniques; in the latter papers with the objective of providing a generic methodology. This work has succeeded …
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A spectroscopic investigation of the thermal decomposition of cellulose and alginic acid
… was also used to deduce the combustion chemistry for the two materials.
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Development and application of Helicobacter pylori surveillance to improve antimicrobial treatment
The determination of H. pylori in vitro antibiotic susceptibility to the four key antibiotics and the underlying mechanisms of resistance were investigated. Levels of antibiotic resistance in two independent populations in England and Wales were determined. In the urban London-based population, …
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Organocatalysts for the asymmetric reduction of aromatic ketimines with trichlorosilane
Asymmetric reduction of N-aryl ketimines 189a j, 212, and 213 with trichlorosilane can be catalyzed by new N-methyl L-amino acid-derived Lewis-basic organocatalysts, such as bisamide 197c (10 mol%), in toluene at room temperature with high enantioselectivity (≤92% ee). The structure-reactivity …
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Synthesis, characterisation and properties of tantalum based inorganic nanofibres
This thesis describes the synthesis and characterisation of 1-dimensional nanometric phases using simple preparative reactions and a variety of characterisation methods. Comparison of properties between the bulk and nano-morphology has played a large part and is a common theme throughout. High …
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Catalysis over molybdenum containing nitride materials
Reactions involving nitrogen transfer/ fixation are of great industrial interest, as novel processes could help industries meet their increasingly challenging economic and environmental targets. An example of this could be the direct synthesis of aniline from benzene, which would avoid the lengthy, …
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Pectic methyl and non-methyl esters and the environmental implications of methanol emissions from plants
Pectin methyl esterase (PME) enzymes are produced by bacteria, fungi and higher plants, and hydrolyse methyl ester groups present on the backbone of pectic polysaccharides found in the primary cell wall of plants. Pectic polysaccharides are required for intercellular adhesion in dicotyledonous …
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Stereoselective synthesis of artificial C-nucleosides
Reported herein is a conceptually new synthetic route to 1’-aryl C-ribofuranosides and their 2’,3’-didehydro 2’,3’-dideoxy (D4) analogues. We have successfully implemented a divergent synthetic route capable to reach two important, biologically significant groups of compounds. The first two …
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New approaches for the synthesis of unusual amino acids
The thermal and metal-catalysed aza-Claisen rearrangement of allylic trichlororacetimidates has found widespread application in the synthesis of nitrogen-containing molecules including alkaloids, antibiotics and unnatural amino acids. We have recently investigated the use of this reaction for the …
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Functional polyoxometalate assemblies: from host-guest complexes to porous frameworks
The host-guest chemistry of two sets of isopolyoxometalate clusters is investigated. In particular the binding modes of cationic alkali and alkali earth metals through coordinative interactions with the cluster anions {Mo36} and {W36} were compared and contrasted. It was shown that the ionic radii …
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Synthesis of biologically active heterocyclic compounds
More than 11 million people worldwide are diagnosed with cancer every year. New cancer drugs are required that are more effective and selective. Nitrogen mustard alkylating agents crosslink DNA inhibiting transcription and replication. Use of the mustard pharmacophore as part of a macrocycle allows …
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Stereoselective synthesis of piperidines
EDITED ABSTRACT. This thesis is divided into two parts. The first part describes the production of a small stereodiverse library of 2-substituted piperidines. Novel chiral titanium alkylidene reagents ii alkylidenated resin-bound esters i to give acid-labile resin-bound enol ethers iii. These were …
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A structural and reactivity study of lithium molybdenum nitride
This thesis describes the preparation and reactivity of lithium molybdenum nitride samples and the preparation and characterisation of the nitride precursors. It has been shown that samples containing lithium molybdenum nitride (LiMoN2) can be formed from the direct ammonolysis of lithium molybdate …
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Utilization of nanostructured surfaces for sensing applications and the use of nanoentities for the fabrication of new materials
The application of nanoscience in various scientific fields is introduced in Chapter 1 by outlining some of the major drivers of this rapidly evolving field. Methods of nanoscale fabrication, utilizing both 'top-down' and 'bottom-up' approaches, are also introduced in this chapter. Nanoscale …
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Ionisation studies of chlorinated and fluorinated compounds
Ionisation processes in gas-phase polyatomic molecules have been studied using threshold photoelectron photoion coincidence and selected ion flow tube techniques for cations and an electron attachment mass spectrometer for anions. Cation formation has been studied for fluoroform (CHF\(_3\)), …
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