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 53 for “"Infra-red Spectroscopy"”.
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Membrane investigations using infra-red spectroscopy and multivariate target factor analysis
Mid Infrared spectroscopy coupled with multivariate Target Factor Analysis (TFA) was used to investigate permeation and localisation of drugs through and within synthetic membranes and human skin. Attenuated Total Reflectance Fourier Transform Infrared (ATR-FTIR) spectroscopy was used for the …
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Studies of the structure and water absorption properties of cellulosic materials by infra-red spectroscopy
… of viscose, dicel and tricel films, prepared in a pure form by techniques develope d during the course of this work. These three materials provide a means of following how progressive acetylation (from 0% in viscose to 88.3% in dicel to 98.3%'in tricel) influences structure and water …
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Structural Investigations of Nematode Anhydrobiotic and Rab11-FIP Proteins by Far-UV Circular Dichroism and Mid-IR Fourier Transform Infra-Red Spectroscopy
… hemoglobin, lysozyme and a-chymotrypsin by CD spectroscopy resulted in excellent agreement of estimated fractional composition with that observed by x-ray crystallography. CD spectroscopy was found to be very accurate for estimating a-helix and random coil content, but considerably less so for …
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The Synthesis, Characterisation and Electrical Conductivity of Poly(Styrene-Co-Acetylene)
… by this new catalyst has been characterised by infra-red and NMR spectroscopy. The conductivity of the pristine material has been studied as a function of temperature, pressure and frequency. The effect on the conductivity of doping the material has also been investigated. The new metathesis …
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Organotellurium compounds for metal organic vapour phase epitaxy
The infra-red detector material cadmium mercury telluride can be grown by the technique of Metal Organic Vapour Phase Epitaxy using simple alkyl telluride compounds as the source of tellurium. New tellurium precursors are required in order to overcome handling and toxicity problems and to reduce …
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The Synthesis, Characterisation and Electro-Optical Properties of Polypentenylene-Block-Co-Acetylene
… The polyacetylene was characterised by infra-red spectroscopy, elemental analysis and scanning electron microscopy. Block copolymers containing polyacetylene and polypentenylene segments were synthesised by sequential addition of cyclopentene and acetylene to an active metathesis …
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New lithiation methodologies to 2-substituted nitrogen heterocycles
… in the position α to nitrogen as well as in situ infra-red spectroscopic monitoring of lithiation reactions and the application of lithiation-arylation in total synthesis. Chapter 2 details the use of in situ infra-red spectroscopy to monitor the lithiation of N-Boc pyrrolidine, N-Boc piperidine, …
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A study of the mannich reaction with certain phenols, of the causes of formation of coloured products and the prevention of their occurence
… of cashew nut shell liquid (CNSL) have been prepared. Mannich bases have also been prepared from methylamine, formaldehyde with phenol and with m-cresol, from diethylenetriamine, formaldehyde and phenol, m-cresol, resorcinol, 3-pentadecylphenol and the component phenols of CNSL. A11 the Mannich …
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Vibrational studies of tetrahalogenocuprates (II)
… (R = CH₃, C₂H₅; n = 1 - 3) were studied by far infra-red spectroscopy. The results, in conjunction with the evidence of X-ray powder diffraction measurements we reported earlier, show that, within each series, the mixed bromochlorocuprates(II) are isomorphous with each other and with the …
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Multiple detector wireless FNIRS sensor to detect hemodynamic activity
… and flexible technique, "functional Near Infra-Red Spectroscopy" (fNIRS), has opened new opportunities for the study of brain functionality. This powerful method uses the optical properties of a tissue at multiple near infra-red wavelengths to dynamically determine the levels of both …
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Surface coating deterioration studies
… Each of the samples was examined using infra-red spectroscopy in the transmission mode.
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Evaluation and Mechanism of Sulphur-Bound Antioxidants in Rubbers
… of the extent of the reaction between the hindered phenolic antioxidant 3,5-di-tertbutyl-4-hydroxyphenyl methane thiol (BHBM) and natural rubber latex, showed that this was low, due to naturally occurring non-rubber constituents. In SBR latex, much higher levels of binding were achieved. The …
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Functional polymers for biomedical application : synthesis and applications
… in mind the polymers were characterised by infra red spectroscopy, gel permeation chromatography and in the case of aqueous soluble polymers by potentiometric titration. Thin films of poly (lysine ethyl ester isophthalamide) plasticised with poly (caprolactone) were cast from DMSO/chloroform …
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Mechanism of the hydropyrolysis of Manvers coal
Manvers coal has been pyrolysed to 500ºC in a stirred autoclave under various pressures of nitrogen (pyrolysis) and hydrogen (hydropyrolysis). All products were investigated. Pyrolysis of coals involves the transfer of hydrogen atoms from one part of their structure to another. In the above …
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Characterisation and modification of hydrogel polymers
… analysis, pyrolysis gas liquid chromatography, infra-red spectroscopy, density determination and surface characterisation by contact angle measurements. The characterisation of some commercially available hydrogel materials was undertaken using such techniques and the results obtained were …
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The synthesis and fungicidal activity of some novel phosphoramidates
… to side reactions. Similar side reactions occurred, but to a lesser extent, when chloral was condensed with 0-ethyl N, N-dimethylphosphorodiamidate, and one derivative was prepared containing the 1,1,1-trichloro-2-(ethoxydimethylaminophosphinylamino)ethyl group. The fifteen potential fungicides …
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A study of epigenetic mineralisation in the Central Zone of the Damara Orogen, Namibia with special reference to gold, tungsten, tin and rare earth elements
… atomic absorption spectrometry, fire assay and infra-red spectroscopy), mineral chemistry studies (electron microprobe and X-ray diffraction) and geochronological work (Rb-Sr whole-rock and mineral age determinations and Pb-Pb model ages) to examine epigenetic mineralisation in the …
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Synthesis and characterization of tethered poly(n-isopropylacrylamide) for quantitative cell adhesion studies
… been characterized using X-ray photoelectron spectroscopy, time-of-flight secondary ion mass spectroscopy, Fourier transform infra-red spectroscopy, ellipsometry and contact angle measurements. Together all these studies proved that uniform, controlled and high molecular weight PNIPAAm brushes …
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Modern Pollen-Vegetation Relationships In Ghana, Tropical West Africa
… It also tests the ability of Fourier Transform Infra-red Spectroscopy (FTIR) to identify Poaceae pollen to below family level. Characteristic taxa from the forest-savannah mosaic landscape were Poaceae and Melastomataceae/Combretaceae, with these reaching 61% and 73% respectively. The moist …
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Machine Learning Methods for functional Near Infrared Spectroscopy
… of human machine interaction. Functional Near Infra-Red Spectroscopy (fNIRS) device is a relatively new device that enables inference of brain activity through non-invasively pulsing infra-red light into the brain. The fNIRS device is particularly useful as it has a better spatial resolution …
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