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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 24 for “"metal dissolution."”.
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Metal Dissolution From Silver Plated Flatware by Organic Acids
… use. Because most flatware items are made of metal and ingestion of certain metals can cause serious health effects, the safety of using heirloom items must be examined. The goal of this effort is to determine the character and amount of matter that is extracted from silver plated flatware …
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Anodic Metal Dissolution In Haloaluminate Molten Salts/Ionic Liquids
… a mass transport-limited process governed by the dissolution of a passive layer of alcl3(s) and/or albr3(s) on the electrode surface. In alcl3-etmeimcl, the passive current density scales linearly with the concentration of alcl4- in the ionic liquid. The heterogeneous rate constant, referenced to …
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Understanding Electrode-Electrolyte Interfaces with Metal Dissolution and Redeposition Chemistry
… understanding of the dynamic characteristics of metal dissolution and redeposition behavior at the electrode-electrolyte interface is essential, which provides the basis for the development of advanced energy and conversion devices (such as electrochromic devices, electrocatalysts, and batteries) …
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Understanding Transition Metal Dissolution from Battery Materials with Solution NMR Methods
… batteries commonly use lithium transition metal oxides as cathode materials, many of which can undergo dissolution of the transition metal(s) into the electrolyte solution. Transition metal dissolution can lead to cathode restructuring, electrolyte degradation, thickening of the anode solid …
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Investigating ferric ion production and consumption trends in a simulated e-waste bioleaching environment for maximum metal dissolution efficiency
… risks as they contain a high amount of toxic metals (e.g. lead) which can leach into the soil, they place a high load on the land and they contain valuable metals making their recovery beneficial. Printed circuit boards (PCBs) are an essential part of WEEE. Although WEEE forms a small part of …
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Deep understanding of degradation in lithium ion batteries through experimental and first-principles study
… from degradation, which include transition metal dissolution, solid electrolyte interphase (SEI) layer formation, and mechanical fracture. To address these issues, applying an ultrathin coating onto active materials via Atomic Layer Deposition (ALD) is an efficient way. Although numerious …
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Effect of Amines as Corrosion Inhibitors for a Low Carbon Steel in Power Industry
… of oxidation. Control samples showed the highest metal dissolution rate. DBU showed the best performance in metal protection and SEM indicated the presence of a free-crack layer formed by fine particles in that set. FTIR showed that DBU apparently favored the formation of magnetite. It is believed …
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A study of the dissolution of atmospherically derived trace metals into North Atlantic seawater
… was to investigate the factors that affect the dissolution of a suite of trace metals from aerosols into seawater from wet and dry deposition, with a focus on important trace metals: manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu) and lead (Pb). To this end, aerosol and …
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Hydrometallurgical processing of nickel sulfides with activated carbon in sulfuric acid medium
… demand for nickel and associated critical metals such as copper, cobalt, manganese, and chromium. Though primary mining remains the dominant supply pathway, increasing scrutiny of environmental impacts, declining ore grades, and resource inefficiencies have intensified interest in secondary …
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Investigating Cathode–Electrolyte Interfacial Degradation Mechanism to Enhance the Performance of Rechargeable Aqueous Batteries
… exfoliation, structure degradation, transition metal dissolution and interface formation in terms of the capacity decay in different cathode materials. We also provide fundamental insights into the materials selection and electrolyte design in the aqueous batteries. In Chapter 3, we select …
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Study of the effect of molten CuCl immersion test on alloys with high Ni-content with and without surface coatings
… steel (AL6XN) were selected as the base metal. There were two types of coating applied to improve the corrosion resistance of the base metals during molten CuCl exposure. A metallic of Diamalloy 4006 and two ceramic of yttria stabilized zirconia and alumina coatings were applied to the …
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Corrosion Behavior of Nuclear Waste Storage Canister Materials
… with iron in the mild steel and accelerated metal dissolution that increased with temperature. Pitting and uniform corrosion was observed in the A285 and A537 mild steel samples. The A537 mild steel, however, displayed lower corrosion rates in the presence of perrhenate compared in the …
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RECYCLING OF PRECIOUS METALS FROM WASTE PRINTED CIRCUIT BOARDS VIA A COMBINATION OF PYRO AND HYDROMETALLURGICAL PROCESSES
… of e-waste, consisting of a diverse mix of metals, polymers, and ceramics. Recycling PCBs is crucial for managing hazardous waste and recovering valuable materials, as they contain higher concentrations of precious metals than other electronic waste. Hydrometallurgical and pyrometallurgical …
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Investigating Chemical and Structural Heterogeneities of High-Voltage Spinel Cathode Material for Li-ion Batteries
… for battery materials. However, transition metal dissolution, interfacial instability, and capacity fading plague these materials when paired with graphite, limiting their commercial capability. Furthermore, variation in Ni/Mn ordering can lead to complex multiphase co-existence and changes …
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Advanced Characterization for Studying Ni-rich Cathode Materials for Li-ion Batteries
… spectroscopy indicated a decrease in transition metal dissolution from the cathode material. These findings underline the importance of studying trace amount dopants to advance the development of more robust Ni-rich cathode materials. The undoped material in the operando studies revealed the …
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Zum zeitabhängigen Verhalten elektrochemischer und morphologischer Kenngrößen bei der chloridinduzierten Korrosion von Stahl in Beton
… macro-cell anode being the location of active metal dissolution. As a result of electro-chemical investigations time dependent and statistically firm free corrosion potentials and specific polarisation resistances of the macro cell anode are now available for the modelling of chloride induced …
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Treatment of Oil-Sands Produced Water by Electrocoagulation
… in Fe-EC. The current efficiencies for metal dissolution obtained with aluminum and iron electrodes materials, as well as their electrochemical behavior, was investigated. Fe-EC had current efficiencies between 90-95%, while Al-EC showed larger than 100% current efficiencies. Besides …
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Active metal brazing of alumina to Kovar® using Ag–Cu–Ti-based alloys
… joints were prepared to eliminate metal dissolution from the Kovar® into the ABA so that the chemical interaction between the ABA and the alumina was undisturbed and could be studied separately. Conditions simulating those of a commercial process result in a bi-layered structure at …
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Multiscale chemistry and design principles of stable cathode materials for Na-ion and Li-ion batteries
… 1000 cycles) are deciphered to be transition metal dissolution and local and global structural transformations. In Chapter 5, we utilize anionic redox in conjunction with conventional cationic redox of cathode materials for alkali-ion batteries to enhance the energy density. We show that the …
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Bioleaching of chalcopyrite
… mobility. Subsequently, a mechanism for copper dissolution was proposed by employing relevant experiments, including the chemical leaching of chalcopyrite by sulphuric acid and ferric sulphate solutions, bioleaching of chalcopyrite in the presence of added ferric ions, and cell attachment …
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