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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 71 for “"Ion Diffusion"”.
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Ion diffusion from Sellafield OPC paste formulations
… waste is highly regulated and the disposal option will be dependent on the radionuclide content of the waste. The encapsulation of nuclear waste to prevent migration of radionuclides into the environment and as a safe means of long term storage and disposal can be achieved using ordinary …
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The Chloride Ion Diffusion in Potassium-Chloride
Made available in DSpace on 2015-05-12T21:41:34Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6604181.PDF: 2031734 bytes, checksum: d6aac7411258f6a282f5cec7c94d8fb1 (MD5) Previous issue date: 1965
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The chlorine ion diffusion in potassium chloride
The diffusion coefficient of the chlorine ion in Harshaw potassium chloride crystals and in potassium chloride crystals containing strontium has been measured. The measurements were made with radioactive chlorine 36 and sectioning techniques. The chlorine ion diffusion coefficient of the Harshaw …
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Pulsed field gradient magnetic resonance measurements of lithium-ion diffusion
The transport of lithium ions between the electrolyte-electrode interface and the electrode bulk is an essential and presently rate limiting process in the high-current operation of lithium-ion batteries. Despite their importance, few methods exist to experimentally investigate these macroscopic …
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Impact of extended defects on ion diffusion and reactivity in binary oxides : assessed by atomistic simulations
Extended defects, such as dislocations, grain boundaries and surface step edges, are ubiquitous in nanomaterials that function in electrochemical devices and heterogeneous catalysts. The objective of this thesis is to advance the understanding of the influence of extended defects on ion diffusion …
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Apical and radial pH diffusion through root dentin from five modern intracanal medicaments: a twelve-week evaluation of alkaline dynamics
… the temporal and spatial behavior of hydroxyl ion diffusion through root dentin from five contemporary intracanal medicaments over 12 weeks, with emphasis on vehicle composition and apical diffusion beyond the medicament terminus. METHODS: Sixty-six extracted single-rooted human teeth were …
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Electrochemically driven phase transformation in energy storage compounds
Nanoscale lithium transition metal phosphate olivines have become commercially important as positive electrode materials in a new generation of lithium-ion batteries. Not surprisingly, many energy storage compounds undergo phase transitions in-situ, including the production of metastable phases. …
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Investigation of Charge Transfer in Metal-Organic Frameworks for Electrochemical Applications
High-performance functional electrode materials are critical for the development of electrochemical energy conversion and storage technologies. Among various advanced materials, three-dimensional (3D) porous structures have attracted extensive interest due to their high surface area and capability …
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Durability studies of high performance concrete used for bridge decks
… of limestone and gravel. Durability evaluations included: electrical indications of chloride penetration, chloride ion diffusion test, freeze-thaw/salt scaling test and physical sulfate attack test.;Results and relationships between the results were discussed. Some conclusions were reached …
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Modeling ion mobility in solid-state polymer electrolytes
We introduce a course-grained model of ion diffusion in a solid-state polymer electrolyte. Among many tunable parameters, we investigate the effect of ion concentration, ion-polymer attraction, and polymer disorder on cation diffusion. For the conditions tested, we find that ion concentration has …
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Fundamental Investigations into the Metal-Organic Framework Redox-Hopping Charge Transport——Mechanisms and Improvement Strategies
… (MOFs). Previous studies have shown that ion diffusion is the rate-determining step of redox hopping, but the realization regarding to the fundamental mechanism of redox hopping in MOF is still infantile. In this dissertation, we will discuss the redox hopping process in MOFs from multiple …
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Conducting polymer actuators : temperature effects
… polymer actuators as a viable engineering solution, it is necessary to produce usable levels of force with a reasonable bandwidth. Polypyrrole actuated at temperatures as high as 100 °C increases stress magnitudes by as much as 4x and stress rates by 5x. The effect is caused by a combination of …
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Dynamic modelling and simulation of the all-vanadium redox flow battery
… large energy storage in renewable energy applications, the all-vanadium redox flow battery has received the most attention to date as the energy storage technology most likely to meet the required energy efficiency, cycle life and cost structure. The widespread commercialization of the vanadium …
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Concept and feasibility study of self-organized electrochemical devices
… materials advances. However, the basic configuration he proposed then is still present in today's portable power sources. In this work, using attractive and repulsive London-van der Waals forces, a self-organized, interpenetrating, separator-free rechargeable lithium ion battery called a …
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NMR Characterization of Novel Materials for Battery Electrolyte Applications
<p>The extensive application of renewable and non-renewable energy storage devices in commercial products and services and the global warming have created significant motivations to accelerate research in battery technology. In addition, the risk factors generated by the high heat generation and …
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Determining the lon-exchange Mechanism of Strontium into a Niobium Doped Titanosilicate
… with strontium as time resolved X-ray diffraction data was collected. The structural modeling of this data by Rietveld method1 has lead to the determination of the atomic positions of the ions and unit cell parameters as strontium occupancy increases.</p> <p>The starting material of the …
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Composite cathodes for lithium rechargeable batteries
… copolymers was investigated towards the fabrication of composite, nanoarchitectured electrode materials for solid-state rechargeable batteries. In situ growth of cathodic phases within ion-conducting copolymer domains was explored as a means to control morphology and to increase the …
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Scalable Electrochemical Surface Enhanced Raman Spectroscopy (EC-SERS) for bio-chemical analysis
… nanopillar arrays can serve as three-dimensional nanostructured electrodes with improved performance for electrical recording and electrochemical sensing in bio-electronics applications. However, vertical nanopillar-array electrodes made of inorganic conducting materials by conventional …
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A study of the effects of lithium perchlorate on poly(ethylene oxide), (Peo) melt dynamic behavior using Fabry-Perot interferometry
… the role of the polymer environment in lithium ion transport and conductivity. We implement a fiber-optic coupled Fabry-Perot interferometer to investigate the electrolyte elastic properties and structural response times, which are both related to the intrachain local mobility and therefore to …
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Design, synthesis, and characterization of complex chalcogenides for energy storage and energy conversion applications
<p>"Through this investigation, complex chalcogenides with the combination of main group metals, transition metals, and rare earth metals have been synthesized using the building block approach and their structure-property relationships are evaluated. The main emphasis of research is on rationally …
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