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 10 of 10 for “"carbonate ions"”.
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Carbonate Ions and Gastric Cancer
… ingestion of food supplemented with calcium carbonate more than tripled the incidence of carcinomas (61%) compared to controls (17%). In a second set of experiments, calcium ions were switched to sodium ions, which revealed that carbonate ions caused the remarkable increase in cancer in the …
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Modification of clays with ionic liquids for polymer nanocomponents
… susceptible to exchange of their interlamellar ions with a variety of other cations or anions, were selected. In order to treat cationic clay, montmorillonite, which contains sodium ions as interlayer ions, reagents having cations differing in size and structure included three ionic liquids …
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Design and Modeling of a Novel Direct Carbon Molten Carbonate Fuel Cell with Porous Bed Electrodes
… direct carbon fuel cell (DCFC) based on molten carbonate recirculating electrolyte. In the cathode, co-current flow of electrolyte with entrained gases carbon dioxide and oxygen is sent in the upward direction through a porous bed grid. In the anode, co-current flow of a slurry of electrolyte …
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A novel view on the early stage of crystallization
… early stage of crystallization utilizing calcium carbonate as a model system. Calcium carbonate is of great economical, scientific and ecological importance, because it is a major part of water hardness, the most abundant Biomineral and forms huge amounts of geological sediments thus binding large …
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Investigating the feasibility of implementing microbially induced calcite precipitation to stabilize sand, clay and gold tailings
… produced from bacteria to breakdown urea into carbonate ions. These carbonate ions combine with free calcium ions to form calcium carbonate, which acts as a bio-cement. MICP presents a unique, sustainable soil improvement solution to the pressing issues resulting from tailings impoundment …
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Asymmetrische Synthese von allylischen Alkoholen mittels Palladium-katalysierter asymmetrischer Transformation von allylischen Carbonaten und Synthese neuer Sulfoximin-Phosphane
… For this substitution reaction the hydrogen carbonate ions are used as nucleophil and racemic allylic carbonates or acetates as racemic substrates. This reaction can also be called asymmetrical transformation (AT) or dynamic-kinetic asymmetric transformation (DYKAT). The investigations …
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Preparation and characterization of natural hydroxyapatite from tilapia bones and scales for biomedical applications
… in a lattice structure. The substitution of carbonate ions in the phosphate and hydroxyl sites indicated the presence of AB-type carbonate in bones and scales. The calcination temperature was identified to have influenced the thermal stability of both extracted HA, where decomposition of HA …
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Establishment of the relationship between the sediments mineral composition and groundwater quality of the primary aquifers in the Maputaland coastal plain
… recharge to the aquifers and strong interactions with wetlands in the region. The hydrochemical study of the Richards Bay aquifers suggested that there is rising levels of dissolved minerals in the Science Center aquifer. This study was designed to determine the relationship between sediment …
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Development of Novel Methodologies for the Electrodeposition of Polypyrrole-based Films in Controlled Morphologies with Potential Application in Nitrate Sensing.
… templates or surfactants. Using optimised conditions the nanowires nucleated to give a homogeneous film across the electrode surface, with lengths of approximately 2 μm and diameters of 150 nm. Evidence is presented to support an instantaneous 3-D nucleation and growth mechanism. Structural …
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Manufacturing bio-bricks using microbial induced calcium carbonate precipitation and human urine
… contributor to anthropogenic greenhouse gas emissions with conventional kiln brick production being one of the most energy intensive processes. In addition, phosphorus is a resource that is required by all living organisms and is a key ingredient in many fertilisers. The demand for building …