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Showing 1 to 20 of 31 for “"proton transport"”.
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Investigations of Electron, Ion, and Proton Transport in Zirconium-based Metal-Organic Frameworks
… understanding of the mechanism of electron, proton, and ion transport in these porous structures is needed for their application in electronic devices. The current work focuses on contributing to such understanding by investigating proton-coupled electron transfer, capacitance performance, …
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Chemical and Physical Modifications of Semicrystalline Gels to Achieve Controlled Heterogeneity
… have emerged as desirable candidates for proton exchange membranes (PEMs) due to their excellent mechanical properties, high thermal and chemical stability, and low cost. Specifically, sulfonated multiblock copolymers are attractive because their phase-separated morphologies aide in facile …
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Nano-scale Glucose Fuel Cells for Energy Harvesting in the Human Body Based on Proton Conduction in Cerium Oxide
… glucose fuel cell to date. By use of the ceramic proton-conducting electrolyte ceria and a free-standing membrane device architecture, the novel ceramic-electrolyte glucose fuel cell can be scaled down to a thickness below 400 nm. The ceramic-electrolyte glucose fuel cell is biocompatible by …
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The Influence of Aromatic Disulfonated Random and Block Copolymers' Molecular Weight, Composition,and Microstructure on the Properties of Proton Exchange Membranes for Fuel Cells
… the molecular weights, but water uptake and proton conductivities found insensitive to copolymers" molecular weights. Three series of disulfonated poly(arylene ether ketone) random copolymers have been synthesized and comparatively studied, according to their different chemical structures, …
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Proton-atpase in fish gills
The cellular mechanisms responsible for branchial proton excretion and sodium absorption in freshwater rainbow trout, Oncorhynchus mykiss (Walbaum), were investigated by monitoring the proton excretion rate and determining the proton ATPase activity in gill tissue under different inhibitor …
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Hydrogen in transition metal doped transparent conductive oxide SnO₂
… also to be the best for removing hydrogen via proton reduction and hydrogen evolution from their surfaces due to the relatively high electron concentration they can have. Especially, W-doped is also found to perform best as a hydrogen blocker at all temperature range due to its ability to block …
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Proton-coupled electron transfer : from basic principles to small molecule activation
Proton-coupled electron transfer (PCET) is the basic mechanism for bioenergetic conversion. Hallmark examples of such reactivities include water oxidation which is coupled to photosynthesis and oxygen reduction which is coupled to ATP generation by respiration. These two complementary energy …
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MULTISCALE COMPUTATIONAL MODELING OF NANOSTRUCTURE AND TRANSPORT IN POLYMER ELECTROLYTE MEMBRANE FUEL CELLS
… predicted to revolutionize energy conversion for transportation due to a multitude of advantages over conventional methods. However, due to their lack of resillience to adverse conditions, they are not as widespread as other portable energy technologies. In order to render PEMFCs suitable for …
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Single Ion Detection in Nanotube Nanofluidics
… carbon nanotubes (SWCNTs) to detect proton diffusion in nanofluidic systems at the single-ion level. I first developed a method to encapsulate SWCNTs between two layers of Parylene-C, a polymer with exceptionally low permeability to water and oxygen. The resulting sandwiched …
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Transient Model of Heat,Mass,and Charge transfer as well as Electrochemistry in the Cathode Catalyst Layer of a PEMFC
… model of the cathode catalyst layer of a proton exchange membrane fuel cell is presented. The catalyst layer structure can be described as a superposition of the polymer membrane, the backing layer, and some additional platinum particles. The model, which incorporates some of the features …
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Proton dynamics in ultrathin GdO𝑥H𝑦 films for magneto-ionics
… to be controlled through voltage control of ion transport and electrochemical reactions. This thesis focuses on protonic defects in gadolinium oxide and gadolinium hydroxide (GdOxHy). Protons are mobile in this oxide at room temperature, and hydrogen incorporation can control a variety of …
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Properties and Performance of Polymeric Materials Used in Fuel Cell Applications
… most experts agree that it is not enough. Proton Exchange Membrane (PEM) fuel cells have been widely recognized as a potentially viable alternative for portable and stationary power generation, as well as for transportation. However, the widespread commercialization Proton Exchange Membrane …
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Control of Energy Transfer and Molecular Energetics using Photonic Nanostructures
… dynamics of Excited State Intramolecular Proton Transport (ESIPT) in HMPP. In the second case, we strongly couple multiple vibronic transitions in another organic molecule, diindenoperylene (DIP), to surface plasmons and demonstrate the resulting changes in emission properties at different …
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Tuning the transport properties of layer-by-layer thin films for fuel cell applications
… the devices. At the core of these devices is a proton exchange membrane (PEM) that allows rapid proton transport through the polymer matrix while preventing fuel from permeating across. Additionally, PEMs must have long-term stability in the fuel cell environment, the ability to operate over a …
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Characterization of Structure-Property Relationships in Hydrophilic-Hydrophobic Multiblock Copolymers for Use in Proton Exchange Membrane Fuel Cells
Proton exchange membrane fuels cells (PEMFCs) are one of the primary alternatives to internal combustion engines. The key component is the proton exchange membrane, or PEM, which should meet a number of requirements, including good proton conductivity under partially humidified conditions. A number …
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Conformation of Transmembrane Segments of a Protein by a Coarse Grain Model
<p>The human voltage-gated proton channels (hH<sub>V</sub>1) are critical in many physiological functions and control proton conduction in the cell. This process is governed by the cooperative response of different transmembrane segments of the protein. It is believed that the two subunits of the …
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Characterization and genome-scale metabolic modeling of catechol-degrading Pseudomonas fluorescens isolated from a petroleum hydrocarbon-impacted site
… was constructed to better represent the proton gradient profile. The reconstructed proton transport chain has a P/O ratio of 11/8. Flux balance analysis (FBA) was performed to simulate the whole-cell metabolic flow. The simulation results suggested the β-ketoadipate pathway is involved in …
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The ATP synthase from spinach chloroplasts (Spinacea oleracea) : improved isolation and purification of the enzyme and conformational changes observed with fluorescent labels
… The reaction is driven energetically by proton-transport across the enzyme. The activity of the enzyme is regulated through a transmembrane pH-difference and a redox process, in which a disulfide bridge in the g-subunit is reduced. The protein undergoes a conformational change during …
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Investigation of Two-Dimensional Structured Polyaniline for Supercapacitor Applications
Mass and charge transport within nanostructures, i.e., nanofluidic study, is essential to the mechanism understanding and further development of electrochemical systems. Two-dimensional (2D) nanofluidic materials featuring well-organized flat nanochannels, as well as adjustable structural and …
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