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  • About
  • 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.
51

Neutron reflectivity of aqueous mineral and metal oxide interfaces

Miller, Kathryn Louise January 2014 (has links)
No description available.
52

The composition and interactions of catalytic surfaces in working environments

Warren, David Stephen, n/a January 2007 (has links)
In order to clarify the role that water plays in the photocatalytic process, changes in the IR and Raman spectra of P25 TiO₂ thin films were observed upon exposure to liquid water. Further investigation of these spectral changes via dehydration of thin films under nitrogen and oxygen of different humidities led to the observation of spectroscopic features that have been assigned to localised surface phonon modes. When the effect of UV irradiation on these features was investigated, a broad IR absorption due to transitions of electrons in shallow traps was detected under dry nitrogen but not under dry oxygen. Further investigation of the photocatalytic properties of P25 TiO₂ showed a complete removal of a stearic acid film. The final products have been tentatively assigned to a mixture of short chain carbonyl species and adsorbed carbonates as well as carbon dioxide and water. The IR spectrum of the fuel cell membrane material Nafion is complex and literature data varies in some of the assignments. The compound perfluoro(2-ethoxyethane)sulfonic acid was used as a model compound for the Nafion side chain resulting in a clearer assignment of the Nafion IR spectrum. In light of these new assignments changes induced in the region 1100-1300 cm⁻� by variation in humidity and ion exchange have been shown to be mainly the result of changes in the sulfonate asymmetric stretching modes. By flowing a series of solutions containing tetramethylammonium ions and perchlorate ions the surface charge characteristics of a Pt black film were determined in the pH range 2-12. There proved to be a weak positive charge below pH 4 and a weak negative charge above pH 9. Between these points there appeared to be no overall charge on the surface. When perfluoro(2-ethoxyethane)sulfonic acid was adsorbed to a Pt black film changes in its IR spectrum indicated a strong binding via interactions between the sulfonate groups and the Pt surface. The nature of the adsorption of Nafion was less clear cut and, whilst adsorption is strong, it seems possible that hydrophobic interactions between the Nafion backbone and the surface are involved.
53

Titanium dioxide-based carbon monoxide gas sensors : effects of crystallinity and chemistry on sensitivity

Seeley, Zachary Mark, January 2009 (has links) (PDF)
Thesis (Ph. D.)--Washington State University, December 2009. / Title from PDF title page (viewed on Dec. 28, 2009). "Materials Science Program." Includes bibliographical references (p. 109-118).
54

Adsorption of isoxaflutole degradates to hydrous aluminum and iron oxides

Wu, Si Hyun. Goyne, Keith William. Lerch, Robert N. January 2009 (has links)
Title from PDF of title page (University of Missouri--Columbia, viewed on Feb 24, 2010). The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Thesis advisors: Dr. Keith W. Goyne and Dr. Robert N. Lerch. Includes bibliographical references.
55

Metal complexes containing oxygen tripod ligands : models of metal oxides /

Lam, Chong Ho. January 2003 (has links)
Thesis (Ph. D.)--Hong Kong University of Science and Technology, 2003. / Includes bibliographical references (leaves 275-290). Also available in electronic version. Access restricted to campus users.
56

Nanostructuring and processing of metal oxides in hybrid solar cells

Iza Schmidt, Diana Cristina January 2012 (has links)
No description available.
57

Synthesis and characterization of heterogeneous metal oxide catalysts on amorphous and molecular sieve supports

Bruce, David Alan 08 1900 (has links)
No description available.
58

Nonlinearity of the MOS tunneling structure 1-V characteristic for submillimeter radiation detection.

Fish, Lawrence Irwin. January 1972 (has links)
No description available.
59

Unidirectional solidification of rare earth oxide-metal composites.

Stendera, James Windsor January 1974 (has links)
No description available.
60

The influence of honeycomb dies on paste extrusion mechanics

Oh, Raymond H. 05 1900 (has links)
No description available.

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