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.
Results
Showing 1 to 18 of 18 for “"Proton conduction"”.
-
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 …
-
Structure and dynamics of full-length M2 protein of influenza A virus from solid-state NMR
… focuses on the structure determination and the proton conduction mechanism of the full-length matrix protein 2 (M2) of influenza A virus. The M2 membrane protein can be separated into three domains: an N-terminal ectodomain (1-2 1), an cc-helical transmembrane domain (TM) (22-46) connected to an …
-
Molecular Dynamics Simulations and Cross-Link Analysis of the Rotary Molecular Motor F(o) of ATP Synthase
… that couples the synthesis of ATP in F1 to the proton translocation across Fo which is driven by the electrochemical proton gradient across the membrane. F1 consists of three different subunits in the stoichiometry a1b2c10. So far, only the structure of the c-subunit and a partial structure of …
-
Structure and dynamics of influenza M2 proton channels from solid-state NMR
… (M2) is an essential viral protein that conducts protons in the endosomes of infected host cells and induces membrane curvature to facilitate virus budding. M2's proton channel activity is encapsulated by a transmembrane domain (TM) that is targeted by the FDA-approved antiviral drugs amantadine …
-
Protonic All-Solid-State Electrochemical Device as an Artificial Synapse for CMOS-Compatible Neuromorphic Computing
… a highly energy efficient and CMOS-compatible protonic electrochemical artificial synapse employing the nanoporous gadolinium (Gd)-doped ceria (Gd:CeO₂) as an inorganic solid proton electrolyte. The Gd:CeO₂ was carefully chosen based on the consideration of its high proton conductance, doping …
-
Efforts Towards Micro Fuel Cells
… part of this work, we developed a new class of proton conductors based on nanoporous silicon. Proton conducting electrolytes are crucial components in fuel cells. However, the implementation of prevalent polymer electrolyte membranes leads to difficulties in manufacturing the fuel cell structure …
-
Low Frequency Dielectric Investigations on Hydrated Pharmaceutical Powders
… This relaxation is shown not to be due to proton conduction, or other ionic currents, by the effect of hydration with various solutions (including the effect of /?H, [D2O] and ionic strength). Additionally, particle size was found not to affect the relaxation time. This slow dispersion is …
-
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 …
-
Exploring kinetics and thermodynamics in fast-ion conductors and hydrogen-storage materials using ab-initio molecular dynamics
… motivation for the existence of fast-ion conduction is suggested in terms of an entropic stabilization associated with the decrease in silver mobility upon melting. We also find a unique chemical signature for the fourth nearest-neighbor silver to an iodine. This fourth silver is weakly …
-
Solid-state nuclear magnetic resonance investigations of the influenza M2 protein : structure and dynamics characterization of channel gating and conduction
… methods. In this thesis, the mechanisms of conduction and gating are investigated in the influenza AM2 and BM2 proton channels bound to native-like lipid bilayers. Using pH-dependent 15N chemical shifts of the conserved Histidine residue, we have found that the proton conduction mechanism is …
-
Synthesis and characterisation of proton conducting composite materials resilient to dehydration at elevated temperatures
… any membrane that relies on water to transport protons will dehydrate and thus, the proton conductivity of the membrane will start to degrade. Here the development of a new proton conducting material that is resilient to dehydration is presented. The exploitation of the oxide surface of the ca. …
-
Electron- and ion-conducting metal-organic frameworks
… of MOFs as ionic conductors. In Chapter 4, the proton conductivity of MIT-25 is studied. Owing to its large proton content and compositionally integral hydronium ion, MIT-25 exhibits an strongly hydrophilic environment that facilitates proton conduction. Lastly, Chapter 5 reports a …
-
Durability study of proton exchange membrane fuel cells via experimental investigations and mathematical modeling
… the concepts of elongated polymer aggregates, proton conduction channels as well as states of water. The rationale focuses on the polymer bundle rotation/interphase chain readjustment before yielding and polymer aggregates disentanglement/ reorientation after yielding. In addition, the …
-
Structure Property Relationships of Proton Exchange Membranes
… reported in the literature show reduced proton conductivity at low water content. This was attributed to the formation of an isolated morphology. Over the last few years our group has synthesized thermally stable multiblock copolymers with varying chemical structures and compositions. …
-
Ion Transport, Viscoelastic, and Thermal Properties of Several Poly(Ethylene Glycol) and Poly(Propylene Glycol) Based Polymer Electrolytes
… was observed indicating that the mechanism of proton conduction is dependent on the amount of ether units in the material. The viscosity and ionic conductivity for each individual copolymer electrolyte were correlated following the Walden rule. The ? values for all of the copolymer electrolytes …
-
Probing complex ionic dynamics on the nanoscale via energy discovery platforms
Ionic dynamics underpin the functionalities of a broad spectrum of materials and devices ranging from energy storage and conversion, to sensors and catalytic devices. Electrochemical reactivity and ionic transport in these systems is, however, a complex process, controlled by the interplay of …
-
THE ROLES OF MATERIAL, SURFACE, & MICROSTRUCTURAL EFFECTS IN DEVELOPING CERAMICS FOR ENERGY APPLICATIONS
… industries because of their unique properties. Conduction of multiple charged species simultaneously enables their use as membranes, electrodes, and more. Perovskites especially, have highly tunable features, and can be modified through doping, surface coating, and microstructure. In this work, …
-
Investigations of Electron Transport Properties in Metal-Organic Frameworks for Catalytic Applications
… catalysis, drug delivery, and electron or proton conduction. It has been the goal of my graduate research to investigate MOFs for their ability to transport electrons and store and separate gases for ultimate catalytic applications in alternative energy generation. I aim to provide new …