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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 161 to 170 of 306 (0.008 seconds)| 161 |
Statistical Investigation of Surface Flaws (Hertzian Fracture Tests on Glass)Poloniecki, J. D. January 1973 (has links)
No description available.
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| 162 |
Molecular adsorption on TiO2 surfaces : modelling potential biomedical and photovoltaic devicesSyres, Karen Louise January 2010 (has links)
This thesis describes molecular adsorption on single crystal anatase (101) and rutile (110) TiO2 surfaces and TiO2 nanoparticles using photoemission and near edge X-ray absorption fine structure (NEXAFS) spectroscopy. DFT calculations were carried out in order to complement the experimental data. The adsorption of dopamine and pyrocatechol on single crystal TiO2 surfaces was investigated with photoemission and NEXAFS and indicates the molecules adsorb in a bidentate mode following deprotonation of the hydroxyl groups. NEXAFS analysis of pyrocatechol adsorption on the rutile (110) and anatase (101) TiO2 surfaces shows the plane of the aromatic ring to be oriented at 23˚±8˚ and 27˚±6˚ from the surface normal, respectively. Dopamine adsorbed on the anatase TiO2 (101) surface was found to adsorb with the plane of the ring approximately normal to the surface. Adsorption of pyrocatechol and dopamine on anatase TiO2 (101) gave rise to a feature below the main pi* peak, not observed when pyrocatechol was adsorbed on rutile TiO2 (110). This feature was replicated in DFT calculations of both dopamine and pyrocatechol adsorbed on an anatase TiO2 cluster, but was not present in calculations of the free molecules. The new states are found to be located on the TiO2 surface, which may allow direct charge-transfer from the molecule to the surface. Simulated NEXAFS spectra from the cluster showed good agreement with the experimental data in the pi* region for the molecule-anatase TiO2 (101) system. The rutile experimental data showed good agreement with calculations of the free molecule in terms of the pi* peak separation. Charge-transfer studies of pyrocatechol adsorbed on the rutile TiO2 (110) surface indicate that charge-transfer could be occurring from the LUMO, LUMO+1 and LUMO+2 in the pyrocatechol molecule. The charge transfer time for this system was found to be < 9.0 ± 2.0 fs. XPS results for functionalised TiO2 nanoparticles show that dopamine (DA) molecules adsorb intact and bond through both oxygen atoms. The attachment of PEG (polyethylene glycol) and Pluronic was investigated. PEGme-DA (terminated with methyl) and DA-PEG-DA showed attachment to the nanoparticles occurs through one end of the chain. DA-Pluronic-DA may attach through both DA molecules but this could not be proved conclusively. Adsorption of malonic acid on rutile TiO2 (110) showed that the molecule degraded under the synchrotron beam and formed acetate and/or formate. It was found that dipping this surface into a ruthenium di-2,2'-bipyridyl-4,4'-dicarboxylic acid diisocyanate-dye solution in air appeared to displace the adsorbed species, replacing them with the dye.
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| 163 |
A phenomenological analysis of plastic spherical indentation and its application to the deformation mechanics of contact between rough surfacesFrancis, Henry Almiron January 1978 (has links)
No description available.
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| 164 |
Stress in thin filmsWilcock, John David January 1967 (has links)
No description available.
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| 165 |
Electrical effects of gases on lead telluride thin filmsSangha, Surinder Pal Singh January 1980 (has links)
No description available.
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| 166 |
Spin-dependent recombination of photo-generated carriers at silicon surfacesMcWalter, Ian Lindsay January 1977 (has links)
No description available.
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| 167 |
Electron density and pair correlation functions in metalsCusack, Stephen Anthony January 1976 (has links)
No description available.
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| 168 |
Nucleation and growth of sputtered thin filmsLane, George Edward January 1972 (has links)
No description available.
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| 169 |
Some interface phenomena associated with the Johnsen-Rahbek effectLevermore, Geoffrey John January 1975 (has links)
No description available.
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| 170 |
An electron diffraction study of the epitaxy of lead, thallium on copper, silverRawlings, Kenneth John January 1974 (has links)
No description available.
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