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Showing 1 to 20 of 27 for “"Manganese dioxide"”.
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Oxidation of aqueous sulfides in the presence of manganese dioxide
… of the oxidation potentials indicates that manganese dioxide is thermodynamically capable of oxidizing aqueous solutions cf hydrogen sulfide. A three part study was undertaken to: 1) determine the kinetics of the oxidation both in the presence and absence of oxygen, 2) measure the end …
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Alkaline Potassium Polyacrylate Electrolytes for Rechargeable Zinc-Manganese Dioxide Batteries
<p>Zinc (Zn)–manganese dioxide (MnO<sub>2</sub>) rechargeable batteries have high specific theoretical capacity as well as being environmentally friendly, intrinsically safe and low-cost. Liquid electrolytes, such as potassium hydroxide (KOH), are historically used in these batteries; however, many …
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The interaction of metal ions at the hydrous manganese dioxide-solution interface
… of metal ions with the surface of hydrous manganese dioxide has been completed. The results of these experiments have greatly improved our qualitative understanding of the adsorption mechanism and have also provided a means of testing quantitatively the proposal that the concentration of …
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Part I. Manganese Dioxide Oxidations of Alkyl Ferrocenes. Part Ii. Reduction Studies of Alkyl Ferrocenes
Made available in DSpace on 2014-12-05T19:38:14Z (GMT). No. of bitstreams: 1 6305092.pdf: 4819191 bytes, checksum: 2a832ef19ea72bbdc95a82920a378a11 (MD5) Previous issue date: 1963
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Manganese dioxide reduction kinetics by Geobacter sulfurreducens and associated biofilm morphology in a flow-through reactor
… This study evaluated the reduction kinetics of manganese dioxide using Geobacter sulfurreducens, an extensively studied DMRB, with acetate as the electron donor. At low flow rates, a yield of 3.44x1010 ± 2.54x1010 cells/mmol MnO2 was calculated and a maximum specific growth rate of 0.02 1/hr was …
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Investigating the Effect of Electrolyte Concentration and Charging Protocol on Materials Utilization in Rechargeable Zinc Manganese Dioxide Batteries
… 280mAh/g for commercially available electrolytic manganese dioxide (EMD). In this one-electron range, discharge occurs by proton insertion producing Mn<sup>+3</sup> which then reverts to γ-MnO<sub>2 </sub>on charging. In the first part of the thesis, we investigate the root cause of failure of …
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The characterisation of Manganese (IV) compounds and the study of the thermal decomposition of Potassium Chlorate alone and with Mn(IV) and other oxides and salts
Manganese dioxide compounds are preferred curing agents for Polysulphide resins used as sealants in industry. These are required to have consistent setting characteristics and the investigation was initiated to characterise a number of proffered compounds of this type an to establish criteria by …
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The utilization of paper mill wastes in the flotation of manganese ores
Low-grade pyrolusite manganese ore from the Paint Bank deposits of Virginia was prepared for flotation by grinding to different degrees of fineness. The coarsest size was a 28 Tyler Mesh and the finest was 100 Tyler mesh. Under size products of the grinding were as fine as minus 200 Tyler Mesh. …
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The Formal Redox Potential of the Permanganatemanganous System in Sulfuric Acid
… accurate standard potentials for the manganous-manganese dioxide system and the manganese dioxide-permanganate system in order to calculate the thermodynamic oxidation potential of the manganous-permanganate couple.
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The adsorption of Ni, Cu, Zn, Cd and Pb by δ-MnO₂ and its inclusion in an equilibrium model of metal partitioning in soils
… were available. This precluded the inclusion of manganese dioxide in equilibrium models of metal fate in soil systems. Surface complexation properties of a synthetic manganese dioxide were investigated using glass electrode potentiometry. Experimental data were interpreted according to the …
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Synthesis and characterization of lithium-manganese-oxide electrodes for lithium battery applications
… the inexpensive and environmentally friendly manganese dioxide, Li/MnO₂ batteries are being used extensively for powering a range of devices, but particular electronic systems.
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The development of appropriate brine electrolysers for disinfection of rural water supplies
… to be superior as compared to the ruthenium dioxide and manganese dioxide electrolysers in terms of hypochlorite generation. Analysis of hydroxyl radicals was undertaken since there were claims that these are produced during brine electrolysis. Hydroxyl radical analysis was not successful, …
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The interaction of cobalt, amino acids, and cobalt amino acid complexes with sediment surfaces
… with birnessite by chelation of the surface manganese. Measurement of the Mn 3s splitting for amino acid saturated birnessite samples showed that the surface was reduced. It was inferred that the manganese dioxide surface oxidizes amino acids, but no proof of oxidized amino acids was …
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Investigations of rate limitation in nanostructured composite electrodes and experiments towards a 3D Li-ion microbattery
… of half-cell 3D microbatteries, based on a manganese dioxide cathode and a lithium foil anode, was limited by the lithium ion transport distance through the porous 3D structure. The electrodeposition of conformal polymers layers onto 3D substrates was investigated. The use of …
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Improving lithium-ion battery power and energy densities using novel cathode architectures and materials
… pore architectures. Thin-films of lithiated manganese dioxide were deposited onto the nickel current collectors, and the cathodes were analyzed. New active materials in the three-dimensional bicontinuous cathodes should help to improve the overall energy density, without sacrificing …
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Manganese removal from an organic-laden surface water
Manganese is a problem at the Ni River Water Treatment Plant in Spotsylvania County, Virginia. The Ni River Reservoir (the water source) is a eutrophic reservoir. In the summer, the dissolved oxygen decreases to near or zero at depths greater than two meters. As a result, soluble manganese …
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Metal binding to transferrin and immune reactions in Parkinson's disease
… the form of potassium permanganate and activated manganese dioxide reduced Ga-Tf binding in control plasma. However, relatively little response was observed using monocyte preparations. The results suggest that oxidants produced by activation of the cellular immune system could damage the Tf …
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Nanoarchitectured Energy Storage Devices
… Nanoprinting (SNAP), to fabricate highly ordered manganese dioxide (MnO2) nanopillars is introduced. The SNAP method that is further modified to develop carbon nanoarray electrodes is also discussed. Subsequently, a template-free method to develop high aspect ratio copper oxide nanowhiskers on …
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Superoxide-assisted solid-state synthesis of birnessite type MnO2 materials: physiochemical properties and electrochemical viability
… Under these classes of metals, nanostructured manganese dioxides have garnered attention as cathode materials due to meeting all these requirements as well as having a rich electrochemical profile owing to their multitude of crystal structures and properties. This work reports a novel …
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Mn(II) oxidation by HOCl in the presence of iron oxides: a catalyzing effect
The oxidation of soluble manganese (Mn(II)) to insoluble manganese dioxide (MnO<sub>x(s)</sub>) is fairly well understood; however, the role of ferric hydroxide/oxides (Fe(OH)₃<sub>(s)</sub>) in catalyzing the oxidation of Mn(II) by oxidants such as free chlorine (HOCI) is one specific aspect of …
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