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 20 of 23 for “"local pH"”.
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Electrochemistry of Polyaniline-DNA System.
… - deoxynucleic acid (PAN / DNA) and the poly-(o-phenylenediamine)-DNA (POPD-DNA) complexes can be synthesized electrochemically in acidic media in the potential range of –0.2V to 0.8 V vs. Ag/AgCl reference electrode, respectively. The ultraviolet-visible (UV-Vis) spectroscopy, the …
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Interfacial Study of Copper Electrodeposition with the Electrochemical Quartz Crystal Microbalance (EQCM)
… and ruthenium substrates is investigated at pH values higher than zero. In pH=5 solutions, the rise in local pH caused by the reduction of oxygen leads to the formation of a precipitate, characterized as posnjakite or basic copper sulfate by means of X-ray electron spectroscopy and X-ray …
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Engineering electroresponsive layer-by-layer thin films
… nanoparticles and the control over local pH utilizing the electrochemical reduction of dissolved oxygen. These strategies and the multiple materials systems explored are described below. Redox-active Prussian Blue (PB) nanoparticles exhibit multiple, stable oxidation states and can …
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Estudo do mecanismo de corrosão pelo CO2 em aço carbono via técnicas eletroquímicas em condições que incluem alta pressão e temperatura
… the medium containing strong acid with the same pH and this scenario makes even more relevant the development and improvement of corrosion models used to predict corrosion rate of steels. In this context, the role of CO2 in the anodic dissolution mechanism of carbon steel was investigated through …
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Structural Basis for Dishevelled-2 Association to the Plasma Membrane
… the recruitment of ionic lipids, such as phosphatidic acid, to regulate its localization to the plasma membrane and association to the frizzle receptor. However, the physical mechanism for DEP association to the plasma membrane is still unknown. We show that mDvl2-DEP interacts with …
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Nucleic acid denaturation at an electrode surface
… during an electrochemical melting experiment (pH and ionic strength) was explored.<br/><br/>A number of possible mechanisms for electrochemical melting have been ruled-out, including electrostatic repulsion from the electrode surface. It was found that peptide nucleic acid (an uncharged …
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Pyridine Modified Gold Nanoparticles for Electrocatalytic Carbon Dioxide Reduction and Methanol Oxidation Reactions
… used to promote CO2 reduction by controlling the local pH of an electrode to enhance catalytic efficiency and selectivity. This research project primarily focuses on developing pyridine-modified Au nanoparticles for catalyzing electrochemical CO2 reduction and methanol Oxidation. The effects of …
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In-situ early detection of metal corrosion via "turn-on" fluorescence in "smart" epoxy coatings
… to corrosion of the metal substrate. When localized corrosion occurs, without being detected, it can result in disastrous failure of the metal structure. The purpose of this thesis is to develop a "smart" epoxy coating system that detects early stages of metal corrosion via indicators …
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Spectroscopy and Electrochemistry of Nanometre-Scale Plasmonic Gaps
… in NPoM gaps. I extend this work by quantifying photovoltage forming across NPoM junctions and connect this to single atom movement and single molecule spectroscopy. Moving towards chemical reactions, I study the protonation and deprotonation of acidic molecules inside NPoM and find that local pH …
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Tuning Heterogeneous Catalysis Using Interfacial Polarization
… can polarize the interface, resulting in a local environment at the active site that is radically distinct from the environment in the bulk liquid phase. Thus, unraveling the influence of electrical polarization on solid-liquid interface is a critical prerequisite for elucidating reactivity …
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Semi-Artificial Photoelectrochemistry through Perovskite Integration and Elucidation of the Local Environment
Semi-artificial photoelectrochemistry combines state-of-the-art semiconductors developed in the photovoltaic industry with highly selective and active biological catalysts evolved for specific fuel-forming reactions. The biohybrids combine the benefits of both photovoltaic and bioelectrochemical …
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Ultrafast 2D IR spectroscopy of membrane peptide systems
… peptides was probed using singly isotope-labeled pH (Low) Insertion Peptides, or pHLIPs. These peptides are a class of small transmembrane helices containing ~30% polar residues. By including a single-residue ¹³C=¹⁸O isotope label on the pHLIP backbone, IR experiments effectively produce a …
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In Situ Studies of Corrosion and Electrodeposition Using Atomic Force Microscopy
… level. Dissolution of copper was crystallographic in 0.5 M H$\sb2$SO$\sb4$ at overpotentials up to 100 mV; addition of BTA provided corrosion inhibition up to 300 mV overpotential, where pitting occurred. Surface preparation of pure aluminum was not reproducible, and the differences altered …
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Investigating the function of the multidrug transporter ABCG2
… unrelated molecules from mammalian cells. Physiologically, the protein is thought to serve a protective role; ABCG2 is expressed in certain stem cell populations, as well as at “barrier sites” throughout the body. Thus, ABCG2 expression is important from a pharmacokinetic perspective: …
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Multiscale modelling of CO₂ Electroreduction on Cu - based gas diffusion electrodes (GDEs)
… like ethylene since they both thrive in a high pH regime. The favorability of homogeneous bicarbonate reaction over CO₂RR is as a result of the non-requirement of any electron transfer for the same reaction. This makes them susceptible to occurring at any point in the system as long as CO₂ and …
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Análise metagenômica da comunidade bacteriana de vacas com distúrbios reprodutivos.
… The majority were anaerobic with a neutral pH optimal for bacterial growth. The data for the bacterial diversity in the profile with reproductive disorders suggests a significant change in the environment. In this state, anaerobic, facultative and aerobic genera are present. The pH of the …
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New Insights into Lead and Copper Corrosion: Impacts of Galvanic Corrosion, Flow Pattern, Potential Reversal, and Natural Organic Matter
… natural organic matter (NOM), and orthophosphate (added as corrosion inhibitor) may have a significant influence on corrosion of common lead plumbing materials. Results of bench-scale experiments demonstrate that in some waters galvanic corrosion can multiply lead release from lead pipe …
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The Incorporation and Controlled Release of Anionic Drugs from a Polypyrrole Membrane Film
… included the aqueous soluble dexamethasone 21‐phosphate disodium (NaDex) and valproic acid sodium (NaVPA) salts, and the less soluble diclofenac sodium (NaDF) salt. Two other drugs, indomethacin sodium (NaIndo) and sulindac sodium (NaSul) with very imited solubility in aqueous solution, were …
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Reconstructing local redox conditions, mineral precipitation processes and nutrient availability in seawater during deposition of the Transvaal Supergroup, South Africa
… an Fe(II)-silicate mineral, as a primary phase in IF and a potential proxy for ancient seawater chemistry. This study combines geochemical reconstructions from carbonate rocks with mineral-specific data from greenalite. The Transvaal Supergroup in South Africa spans the Great Oxidation …
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Poly(vinyl alcohol) based hydrogen-bonded multilayers : from pH-controlled multi-stage dissolution to zwitter-wettable surfaces
… hydrogen-bonding partners as well as its overall pH-stability. The library of materials that can be hydrogen-bonded with PVA was further extended by assembling films with biologically relevant molecules such as tannic acid. This leads to enhanced pH-stability as a result of the high pKa value of …
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