Oxidation of manganese sulfate to manganese dioxide in 30% sulfuric acid

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Predicting the outcomes of redox processes in aquatic environments requires quantitative constraints on electron transfer reactions. Advances in electrochemical techniques have significantly improved our ability to quantify and constrain mineral-related biogeochemical redox processes that regulate carbon, nutrient, and contaminant cycling in aquatic environments. Manganese oxides are key redox-active minerals in these systems that influence organic matter transformation, nutrient availability, and contamina

Continuous development of thin film deposition technologies is essential for fabricating materials that meet the targeted requirements of specific applications. In this context, the present dissertation focuses on atomic layer deposition (ALD) of metallic copper, aiming to deepen the understanding of Cu ALD and establish a groundwork for future application-driven process development. Specifically, the Cu ALD process investigated in this work was based on copper(II) hexafluoroacetylacetonate (Cu(hfac)2) and

Lactic acid bacteria can use an electron transport system to pass reducing equivalents to extracellular mediators. This redox flexibility decouples carbon and electron balances and presents the opportunity to use electrodes to engineer fermentations. We show that growth with an anode may be a two-edged sword for the fitness of the model lactic acid bacterium Lactiplantibacillus plantarum grown in a chemically defined medium supplemented with quinones, depending on substrate and cultivation regime. In batch

The Oxygen Generator Assembly (OGA) aboard the International Space Station (ISS) consumes a substantial portion of the overall Environmental Control and Life Support System (ECLSS) power budget (32.6% 1 ). It has been deemed both unreliable and cumbersom 2 . In preparation for long-duration deep-space missions, where resupply is impossible, reliable and energy-efficient systems are needed to produce oxygen for life support and hydrogen for rocket fuel 1 . However, under microgravity conditions, traditional

The increasing efficiency of perovskite solar cells (PSCs), driven by their low cost, low carbon footprint and easy processability, offers real opportunities for new markets in innovative photovoltaic (PV) technology. A crucial challenge in this transition is device instability. Carbon-based perovskite solar cells offer a promising alternative with the advantages of more abundant materials and stable performance. This review provides a comprehensive and critical analysis of recent advancements in carbon-bas

The synthesis of a new series of neutral bis[2-(2,4-difluorophen-2-yl)pyridine][1-(2-aryl)-3-methylimidazol-2-ylidene]iridium(III) complexes is reported. Each complex has been characterized by NMR spectroscopy, UV/Vis spectrophotometry, and cyclic voltammetry, and the photophysical properties examined in depth. Furthermore, two of the complexes have been characterized by single-crystal X-ray diffraction analysis. By systematically modifying the cyclometalating aryl group on the N-heterocyclic carbene (NHC)

The magnetic properties of a Mn-19 coordination cluster equipped with methylmercapto substituents on the organic ligands, [(Mn12Mn7II)-Mn-III(mu(4)-O)(8)(mu(3)-Cl)(7.7)(mu(3)-OMe)(0.3)(HLSMe)(12)(MeOH)(6)]Cl-2 center dot 27MeCN (Mn-19(SMe)) (H3LSMe = 2,6-bis(hydroxymethyl)-4-mercaptomethylphenol) deposited on Au(111) surfaces from solution, have been investigated by X-ray absorption spectroscopy and X-ray magnetic circular dichroism. The data reveal that in the submonolayer regime the molecules contain only

The successful experimental demonstration of large-scale and in-situ growth of horizontal, dense and aligned carbon nanotube (CNT) arrays is presented. This new CNT growth process is developed for the direct integration of nanotubes into gas sensing devices. The device electrodes are patterned in a TiN/Al2O3/TiN stack which is used as a support for the CNT growth catalyst. Thereafter, iron is locally deposited on the stack’s vertical sidewall as a catalyst material. With the use of a chemical vapor depositi

As reliable mobile energy sources became more and more needed and alternative energy demands became more prevalent, the research in advanced energy storage technologies turned into a topic of utmost importance in today's society. Innovative electrode materials that are able to provide increased energy densities and long lifetime must be then be developed. Nanomaterials such as carbon nanotubes are of tremendous prospects in that context. This master thesis aims at realizing an electrochemical capacitor usin

The interaction between an intact protein and two lipophilic ions at an oil-water interface has been investigated using cyclic voltammetry, impedance based techniques and a newly developed method in which the biphasic oil-water system is analyzed by biphasic electrospray ionization mass spectrometry (BESI-MS), using a dualchannel electrospray emitter. It is found that the protein forms interfacial complexes with the lipophilic ions and that it specifically requires the presence of the oil-water interface to

The electrochem. oxidn. of chloranilic acid (CAA) was studied in acidic media at Pb/PbO2, B-doped diamond (Si/BDD) and Ti/IrO2 electrodes by bulk electrolysis expts. under galvanostatic control. The obtained results have clearly shown that the electrode material is an important parameter for the optimization of such processes, deciding of their mechanism and of the oxidn. products. The oxidn. of CAA generates several intermediates eventually leading to its complete mineralization. Different current efficien

The present work investigates the possibility of selective electrochemical metal deposition on ion implanted p-Si. The idea is that defects introduced into the substrate by ion implantation make it more susceptible to electrochemical reactions compared to intact Si; this increased sensitivity is to be used for selective reactions at the defect sites. It is believed that the increased reactivity is due to a lowering of the Schottky barrier breakdown potential, Ubd, of the semiconductor-electrolyte interface

The aim of this work was to develop a microchamber system for performing electrophysiological measurements on epithelial surface on culture membranes in the mm2 range. This miniaturised system permits the use of small quantities of epithelial cells, which in relatively short time grow into a tight layer that can be used in electrophysiological (ion transport) experiments. Availability of cells is an issue, for example when the cells originate from human biopsies or from (expensive!) transgenic mice. Apart f

The anodic oxidn. of H2SO4 to H2S2O8 was investigated on B-doped synthetic diamond electrodes obtained by hot filament chem. vapor deposition. High current efficiency for H2S2O8 formation can be achieved in concd. H2SO4 (7.5 mol dm-3) and using high current densities (200 mA cm-2). The main side reaction is oxygen evolution. [on SciFinder (R)]

Several bottom electrode systems for ferroelectric thin film deposition onto reactive substrates or reactive metal films have been investigated with respect to chemical barrier properties and contact resistivity. Such electrode systems should not deteriorate by oxidation, and should prevent oxygen diffusion into the underlying base metal. First, the protective performance of Pt, Ru, RuO2/Ru, and Cr has been evaluated on reactive substances such as W, Zr, Mo, and TiN; On most materials, a reactive and passiv

Measurements of anions and cations are reported for hydrocarbon and silane radio frequency capacitive glow discharges. Series of anions were observed by quadrupole mass spectrometry using power-modulated plasmas, and their structures are interpreted from the form of the mass spectra. Various experiments in silane plasmas show that anion confinement results in particles and conversely, anion detrapping can inhibit particle formation. In contrast, the polymerized neutral flux magnitudes, mass spectra and dyna

For the development of an elec. rechargeable zinc/air battery, La0.6Ca0.4CoO3-catalyzed (perovskite) bifunctional oxygen electrodes and pasted zinc electrodes were prepd. and tested in a monopolar zinc/oxygen cell. In addn., a bipolar Zn/oxygen stack was tested using reticulated copper foam as substrate for the zinc deposit. The cells were cycled in moderately alk. ZnO-satd. electrolytes with KF as an electrolyte additive. The max. power as well as the cycle life of the cells was investigated. The microstru

A Ca2+ sensor based on the admittance change of synthetic membranes supported on derivatized silicon electrodes is reported. The ion-sensitive membranes consist of mixed monolayers of phospholipid and the Ca2+-ligand ETH 1001. The electrodes are characterized electrochem. and their sensor performances are described. Through ion complexation by the neutral ligand, elec. charges are incorporated in the low-dielec.-const. environment of the sensitive layer. The no. of charged complexes and thus the membrane ad

The pptn. of barium sulfate from a basic EDTA complex upon addn. of a small vol. of acid in a stirred-tank reactor was used as a model reaction to study the local state of micromixing. Limitations and modifications of this reaction are presented, and its application on an industrial pilot scale is realized. A higher reaction rate is used in order to decrease the reaction time by using different concns. of reactants which modify the stability of the ppt. A study of this stability is presented. [on SciFinder

he electrochemical oxidation of phenol for waste water treatment was studied at a platinum anode. Analysis of reaction intermediates and a carbon balance has shown that the reaction occurs by two parallel pathways; chemical oxidation with electrogenerated hydroxyl radicals and direct combustion of adsorbed phenol or/and its aromatic intermediates to CO2.

Oxidation of manganese sulfate to manganese dioxide in 30% sulfuric acid

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Quantification of Mn(III)-Oxide Redox Activity: Integrating Mediated Electrochemistry with Kinetic and Mass-Transport Modelling

Atomic Layer Deposition of Copper using Cu(II) Hexafluoroacetylacetonate and Diethylzinc: Surface Reaction Mechanisms and Surface Material Selectivity

Prophage induction and acetate availability are associated with distinct Lactiplantibacillus plantarum electrode responses

Modelling Gas Bubble Dynamics and Electrochemical Reaction Overpotentials in Reduced Gravitational Conditions

Low-cost, large-area carbon electrode perovskite solar cells

Molecular Engineering of Iridium Blue Emitters Using Aryl N-Heterocyclic Carbene Ligands

Reduction of Mn19 Coordination Clusters on a Gold Surface

Large-scale, in-situ integration of horizontal carbon nanotube arrays into gas sensing devices

Vertically aligned carbon nanotubes for supercapacitor and the effect of surface functionalization to its performance

Interfacial Complexes between a Protein and Lipophilic Ions at an Oil-Water Interface

Electrochemical incineration of chloranilic acid using Ti/IrO2, Pb/PbO2 and Si/BDD electrodes

Electrochemical investigation of ion implanted p-Si

Biosystem for the culture and electrical characterisation of epithelial cell tissues

Preparation of peroxodisulfuric acid using boron-doped diamond thin film electrodes

Conducting barriers for direct contact of PZT thin films on reactive substrates

Anionic clusters in dusty hydrocarbon and silane plasmas

New generation of rechargeable zinc-air batteries

Calcium(2+)-sensitive monolayer electrodes

Barium sulfate precipitation as model reaction for segregation studies at pilot scale

Anodic oxidation of phenol for wastewater treatment