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 75 for “"Oxide Film"”.
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Optimization of copper oxide film by dip coating technique for oxygen detection
Copper oxide (CuO) based gas sensor has been widely investigated due to its low- cost material, nontoxicity and abundant on earth. The CuO hierarchical structure is used to enhance the sensing performance of the gas sensor. This is because of its structure provides large surface area for the …
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OXIDE FILM FORMATION AND CONVERSION MECHANISM ON CARBON STEEL UNDER MILDLY BASIC CONDITIONS
… and the physical and chemical nature of surface oxide formed during corrosion. Nuclear plant environment includes the additional challenge of fields of ionizing radiation that can affect the redox conditions in solution. To develop a fundamental understanding of radiation induced corrosion, the …
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UV/ozone induced oxidation of silicon(1-x) germanium(x) alloys and thermal desorption of the oxide film
… x}$ alloys and thermal desorption of the oxide film. A low temperature technique has been demonstrated for cleaning Ge wafer surfaces for the growth of high quality epitaxial films. Using x-ray photoelectron spectroscopy (XPS) and other techniques, it is shown that 30 min exposures of a …
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Effects of oxide film, Fe-rich phase, porosity and their interactions on tensile properties of cast Al-Si-Mg alloys
… found in cast aluminium alloys namely, double oxide films, Fe-rich phase, and porosity. A different level of each defect was introduced into the castings to investigate their effects on tensile properties with the results analysed by Yate’s algorithm and Weibull statistical analysis to …
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The effects of simulated inflammatory conditions on the corrosion and fretting corrosion of CoCrMo alloy
… (SI) conditions affected the electrochemistry, oxide film and fretting corrosion behavior of CoCrMo alloy. </p> <p>A range of SI solutions, based on phosphate buffered saline with H2O2, HCl, HClO and Fe3+ additions, were investigated. Results of electrochemistry tests (open circuit potential, …
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Corrosion behavior and mechanism of metallic biomaterials produced by laser powder bed fusion
… demonstrate similar corrosion behavior, but the oxide film formed on Ti35Nb-M shows inferior stability with more defects. Dual-layered films are found on the TiNb regions both in Ti35Nb-M and Ti35Nb-P, while the outer porous layer on Ti35Nb-M exhibits more defects due to the microgalvanic effect. …
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Initiation and growth of corrosion fatigue crack for AVPP treated stainless steel.
… of material surface condition, notably passive film condition and surface residual stress and the effect of applied surface stress on the development of corrosion pits has been assessed in relation to their role on the fatigue behaviour of stainless steel materials, in particular the early …
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Understanding the Corrosion of Low-Voltage Al-Ga Anodes
… hydrogen generation, but it forms a passive oxide film, preventing the anode from corroding. Ga is added to aluminum in small amounts (0.1 wt%) to destabilize this oxide film and allow for active corrosion. The mechanism of how Ga activates Al is still not well-known, though there are …
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Reactivity of Oxide Surfaces and Metal-Oxide Interfaces: Effects of Water Vapor Pressure on Ultrathin Aluminum Oxide Films, and Studies of Platinum Growth Modes on Ultrathin Oxide Films and Their Effects on Adhesion
The reactivity of oxide surfaces and metal-oxide interfaces play an important role in many technological applications such as corrosion, heterogeneous catalysis, and microelectronics. The focus of this research was (1) understanding the effects of water vapor exposure of ultrathin aluminum oxide …
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Aluminium foam production using calcium carbonate as a foaming agent
… to the presence of a thin continuous surface film of metallic oxide that counteracts the effect of surface tension. This film, combined with the finer cell structure of the calcium carbonate-based foams, is found to significantly reduce the rate of gravity drainage of the melt. The formation …
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Direct selective laser sintering of aluminium alloy powders
… powders. That successful disruption of the oxide film is possible is a significant result, as is the constitutional effect on this. The spheroidisation and oxide disruption phenomena in SLS/SLM processed aluminium powders arc suggested to be mainly controlled by the amount of oxide on the …
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Engineering scalable device architectures for lead sulfide quantum dot solar cells
… electrical and optical properties of a nickel oxide film are developed for a new hole-transporting buffer layer as I determine how deposition conditions impact the sputtered film. I integrate the sputtered nickel oxide film into a new quantum dot solar cell architecture that enables aluminum or …
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Performance enhancement of GaN-based high-power hemts by selective-area growth using plasma-assisted molecular beam epitaxy
… as the gate insulator was investigated. Good oxide film quality was confirmed by a low leakage current of 2.76x10-6A/mm and a high gate breakdown voltage of 250V. A dual-SiO2-deposition method which incorporates both PECVD-SiO2 and sputtered-SiO2 was then proposed to solve the problem of …
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Evaluation of corrosion behaviour of hot dip Zn and Zn-Al alloy coatings on steel wire using laboratory and field tests
… as they combine the highly insulating oxide film associated with Al corrosion and the cathodic protection of Zn to the underlying steel.
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Investigating the nature of passive films on austenitic stainless steels
… formation and breakdown of the passive film on stainless steels are mainly controlled by ionic and electronic transport processes. Both these processes are in part controlled by the electronic properties of the oxide film. Consequently it is vital to gain a detailed perception of the …
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Epitaxial Aluminum Oxide Thin Films on Niobium (110): A Study of Their Growth and Their Use in Superconducting Tunnel-Junctions
… I studied the hetero-epitaxy of aluminum oxide on niobium, and the use of these aluminum oxide thin films as tunnel-barriers. Single-crystal Nb/Al2O3 and Nb/Al2O3/Nb multi-layers were grown by molecular beam epitaxy and characterized using a variety of materials analysis techniques. …
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In-situ electrochemical spectroscopy and probe microscopy studies of electrodeposition
… used for industrial applications to deposit films, coatings, and adhesion layers. The diversity of materials that can be deposited has led to numerous studies of electrodeposition processes. This thesis explores two electrochemical systems: 1) the electrodeposition of chromate to form thin …
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Iron-oxide catalyzed silicon photoanode for water splitting
… for water splitting using silicon and iron-oxide. The fundamental limitations of silicon to water splitting applications were overcome by an ultrathin iron-oxide film stack and a pH-adjusted electrochemical environment. It was experimentally demonstrated that this functional photoanode has …
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