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 165 for “"Titania"”.
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Novel Nanostructured Titania and Titania Nanocomposites for Photovoltaics and Photocatalysis
… in high-efficiency DSSCs. In addition, titania nanotubes are modified with other nanomaterials for further increased efficiency of DSSCs. For example, uniformly-sized Ag nanoparticles are deposited onto TiO2 nanotube array via pulse electrodeposition for plasmon effect, leading to …
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Extraction of titania from ilmenite
This thesis is an account of an investigation of a process for separating titanium dioxide from ilmenite. The process makes use of three chemical reactions, all conducted at high temperatures. Ilmenite is first oxidised with air, the oxidised ilmenite is then treated with chlorine,' and finally the …
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Titania Nanowires: synthesis, characterization and properties.
This thesis explored the synthesis of titanium dioxide nanowires by seed assisted thermal growth in the temperature range between 600-1000 °C. In order to improve the photocatalytic performances of TiO2 NWs, we modified the samples applying two approach: doping by ion implantation of Fe+ and …
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Titania-based nanocomposites for solar photocatalysis
This thesis explores several titania-based composites for photocatalytic water treatment and hydrogen evolution. For water treatment, TiO$_2$-C core-shell composites were prepared through controlled hydrolysis of titanium alkoxides followed by calcination in a non-oxygenating atmosphere. A total of …
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Synthesis and characterisation of Titania thin films
The thesis presents publications reporting TiO2 thin film fabrication by spray pyrolysis. A conceptual model of spray pyrolysis mechanism was developed and validated as a diagnostic tool to explain the deposition process, which shows that CVD can be achieved by this method. Effect of deposition …
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Detailed population balance modelling of industrial titania synthesis
… is developed in the context of the industrial titania (TiO2) process to enable extensive numerical characterisation of the pigmentary product. A reactor network model is used to provide a modular treatment of the reactor and account for key features, including multiple reactant injections, and …
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The Effects of Titania on Selected Electrical and Mechanical Properties of Hafnia Rich Mixed Oxides in the System Hafnia Zirconia Titania
Embargo set by: Seth Robbins for item 71878 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs
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Resorcinol-formaldehyde/titania (RFTi) gel composites for wastewater treatment
… effects of carbon and Titanium (IV) oxide or Titania in various applications. Within water remediation, carbon has been utilised in in several forms, such as activated carbon, graphene, carbon nanotubes, and fullerenes, for integration with TiO2. This work focuses on employing a new type of …
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Polyoxotitanates and their role in titania sol-gel polymerization
Hydrolysis of Ti(OBu$\sp{\rm t})\sb4$ with 1 equiv of water in t-BuOH at 100$\sp\circ$C yielded a new polyoxotitanate complex $\rm\lbrack Ti\sb{18}O\sb{28}H\rbrack (OBu\sp{t})\sb{17}$. A single crystal X-ray diffraction study of its t-BuOH solvate revealed a $\rm Ti\sb{18}O\sb{45}$ metal-oxygen …
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Design of Titania Photocatalytic Membranes containing Fine Ceramic Fibres
… These NAF-SAF membranes were impregnated with titania-based sol-gel coatings, to produce photocatalytic membranes. Their mechanical properties, specific surface area and flow properties were assessed and photocatalytic potential was measured by studying rates of degradation of aqueous dye …
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Band Gap Engineering Of Titania Systems Purposed For Photocatalytic Activity
… use of these simulations. In its anatase form, titania (tio2) has been found to exhibit a band gap nearing 3.2 ev. If titania is to become a viable alternative to other contemporary photoactive materials exhibiting band gaps better suited for the solar spectrum, then the band gap must be …
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Structure and reactivity of Titania-supported Molybdenum and Vanadium oxides
For abstract see full text.
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Investigations of the early stages of titania sol-gel processing
While hydrolysis of Ti(OEt)$\sb4$ yielded a complex mixture of polyoxoethoxide species, hydrolysis of Ti(OPr$\sp{\rm i})\sb4$ at ambient temperature yielded $\alpha$- (Ti$\sb{11}$O$\sb{13}$) (OPr$\sp{\rm i})\sb{18}$ as the sole product in solution. Reaction of Ti(OPr$\sp{\rm i})\sb4$ with one …
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Raman, Infrared, X-ray, and EELS Studies of Nanophase Titania
Sol-gel titania particles were investigated, primarily by optical techniques, by systematically varying synthesis, sample handling, and annealing variables. The material phases investigated were amorphous titania, anatase TiO2, and rutile TiO2. Annealing-induced phase transformations from amorphous …
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Characterization and Chemical Activity of Titania-Supported AU-Based Bimetallic Clusters
… desorption (TPD). The importance of the Au-titania interface for low temperature oxidation was illustrated by a series of experiments that show a correlation between the number of Au-titania interfacial sites and the activity on the surface. Bimetallic clusters were grown by first depositing …
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Titania-silica composite materials for self-cleaning applications on monumental stones
Atmospheric pollution has an evidently adverse impact on the aesthetics of urban buildings and structures. Thus, the synthesis of photocatalysts capable of removing pollutants deposited on the surface of stone and other building materials is an interesting challenge to researchers. In the work …
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