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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 23 for “"metal oxide surfaces"”.
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Functionalization of Metal Oxide Surfaces through Chemical Reactions and Physical Adsorption
<p>The synthesis of high surface area metal oxides is an area of extensive research with potential applications in catalysis, adsorption, and materials chemistry. The functionalization of a material’s surface can dramatically change its physical and chemical properties. The research described …
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Structural and electronic properties of noble metals on metal oxide surfaces
Noble metals on metal oxide surfaces play crucial roles in many catalysis applications. Due to extreme complexity of the interfaces and catalytic reaction processes, basic science studies of model systems are needed to guide the construction and optimization of new industrial catalysts. We have …
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Anisotropic and tunable characteristics of the colloidal behavior of metal oxide surfaces
… behavior of the rutile polymorph of titanium dioxide was explored as a function of crystallographic orientation. Atomic force microscopy (AFM) was employed to make high-resolution force spectroscopy measurements between a silica sphere attached to a traditional, contact-mode AFM cantilever and …
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Scanning Tunneling Microscopy and Adsorption Studies on Single-Crystal Metal Oxide Surfaces
Natural and synthetic SnO₂ samples were studied using scanning tunneling microscopy (STM). The SnO₂ surface flattens considerably following high temperature treatments up to 1500 K. The conductivity of the synthetic SnO₂ surface is significantly reduced following annealing at temperatures of …
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Design and construction of rigs for studying surface condensation and creating anodized metal oxide surfaces
… condensation and a rig for creating anodized metal oxides (AMOs). The condensation rig characterizes condensation for different surfaces; this is done with the use of known heat transfer principles to calculate characteristic heat fluxes and heat transfer coefficient values. Preliminary …
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Understanding the pathway and mechanism of electrolyte decomposition on metal oxide surfaces in Li-ion batteries by in situ Fourier Transform Infrared Spectroscopy
… by ex situ characterization of electrode surfaces. In this study, we developed an in situ Fourier Transform infrared spectroscopy (FTIR) method to investigate the (electro)chemical reactions at the interface between the electrolyte and composite positive electrode surface during charging. …
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Interaction of Acid/Base Probe Molecules with Specific Features on Well-Defined Metal Oxide Single-Crystal Surfaces
Acid/Base characterizations of metal oxide surfaces are often used to explain their catalytic behavior. However, the vast majority of these studies have been performed on powders or supported oxides, and there is very little information available in the literature on the interaction of acid/base …
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Condensation heat transfer on nanoengineered surfaces
… low droplet adhesion, superhydrophobic surfaces were investigated for application to dropwise condensation. Although precise model superhydrophobic surfaces were necessary to gain insight into these phenomena, it was recognized that wide-scale implementation necessitates a surface that …
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Surface and interphase studies of the adhesion of a siloxane- modified-polyimide coating on metals
… were found near the bond line of the coating/metal substrate. One was a component gradient interphase which was formed by component segregation of the BDS copolymer. The component gradient was different on different metal oxide surfaces with the siloxane interfacial excess in the order of AI > …
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Molecular adsorption at solid/liquid interfaces using self-assembled monolayer films
… the ability to produce well-defined organic surfaces of controlled composition. This thesis addresses the development and characterization of such films for controlling the adsorptive properties of surfaces toward various surfactant-like molecules and for proteins. Adsorption is controlled to …
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Surface-mediated mechanisms for defect engineering in zinc oxide
… of the defects it contains. In semiconducting metal oxides like zinc oxide, the concentration and diffusion of oxygen point defects, like interstitials and vacancies, play a central role in various physical phenomena, such as gas sensing, bipolar switching, photoluminescence and photocatalysis. …
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Synthesis and Characterization of Thin films of Novel Functionalised 2,5-Dithienylpyrrole Derivatives on Oxide Substrates
… This easy peeling of the PPY layer from the oxide substrate was circumvented by design of novel adhesion promoters, which compatibilise the two incompatible surfaces- the polymer film and the oxide substrate. The first part of the research was focused on the synthesis of different classes of …
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Leveraging features of nanoscale particulates for information encoding, quantitative sensing and drug delivery
… of surfactant adsorption isotherms on metal oxide surfaces, (ii) determination of self-assembly onset concentration, and (iii) high-throughput readout of drug delivery nanoparticle mass concentration. Finally, the combination of small size and large interfacial area was exploited to …
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It's Not a SKZCAM! Accurate Surface Chemistry at Low Cost
… the limitations of embedded cluster models for metal-oxide surfaces. It provides a general, automated framework applicable to a wide range of ionic crystal structures, surface terminations, and adsorption/defect sites. In particular, it leads to small cluster sizes that are amenable for CCSD(T), …
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Single-crystal metal oxides and supported metal nanoclusters as model catalyst sytems
… structure of two basic classes of systems: metal oxide surfaces that catalyze the formation of environmentally persistent free radicals (EPFRs) from aromatic precursors, and Au and Cu nanoparticles that may be suitable catalysts for the catalytic oxidation of CO or hydrogenation of CO2. …
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Defects and alloying in semiconductors: computational studies of clusters and surfaces
… of energy efficient nanomaterials, titanium dioxide and group IV alloy nanoclusters. Titanium dioxide, widely used in heterogeneous catalysis, photocatalysis, solar cells, or gas sensors, has become the prototype material for studying the reactivity of metal-oxide surfaces. Defects such as …
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Development of Core-Shell Polymeric Nanostructures for Delivery of Diagnostic and Chemotherapeutic Agents
… by incorporating a hydrophobic poly(propylene oxide) segment into the block copolymer. The resulting particles have an average hydrodynamic diameter of ~ 200 nm and contain up to 30-40 % of the drug payload. In vitro efficacies of such nanostructures in reduction of intracellular pathogens like …
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Metal Oxide Reactions in Complex Environments: High Electric Fields and Pressures above Ultrahigh Vacuum
Metal oxide reactions at metal oxide surfaces or at metal-metal oxide interfaces are of exceptional significance in areas such as catalysis, micro- and nanoelectronics, chemical sensors, and catalysis. Such reactions are frequently complicated by the presence of high electric fields and/or …
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Interactions of biomass derived oxygenates with heterogeneous catalysts in aqueous and vacuum environments
… solvent for biomass upgrading reaction schemes. Metal oxide and metal oxide supported catalysts are heavily used in oil refining and petrochemical production, and are capable of upgrading biomass molecules as well. However, the surface chemistries that dictate the behavior of aqueous phase …
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Revitalizing Simulations of Colloidal and Interfacial Systems: From Atomistic Trajectories to Data-Centric Insights
… relationships between small adsorbates and metallic or metal oxide surfaces, linking them to energy and atomic forces. Here, it is fine-tuned to adapt these learned interactions for larger molecules, including aromatics. Two curated datasets, a diverse adsorbate-substrate collection and a …
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