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Articles 1 - 9 of 9
Full-Text Articles in Physical Sciences and Mathematics
Synthesis And Characterization Of Fullerene-Based Hydrogen Storage Materials, Patrick Alan Ward
Synthesis And Characterization Of Fullerene-Based Hydrogen Storage Materials, Patrick Alan Ward
Doctoral Dissertations
Storing hydrogen safely and efficiently is an area of great interest for the utilization of hydrogen as an energy carrier in transportation applications. The feasibility of using fullerenes in hydrogen storage materials was investigated. Alkali decorated fullerenes LixC60 [LixC60] and NaxC60 [NaxC60] were found to enhance the hydrogen chemisorption and physisorption properties of fullerenes. Although the overall hydrogen physisorption uptake in these materials is low due to the crystalline nature of the material, the isosteric heats of adsorption of fullerenes were increased by lithium doping. C60 [C60] is also capable of acting as …
Magneto-Optical Properties Of Complex Oxides, Peng Chen
Magneto-Optical Properties Of Complex Oxides, Peng Chen
Doctoral Dissertations
Complex oxides give rise to rich physics and exotic cross-coupled electronic and magnetic properties. This is because of the competing interaction between charge, structure, and magnetism in the materials. In this dissertation I present a spectroscopic investigation of several model complex oxides under external stimuli of magnetic field and temperature. The compounds of interest include BiFeO3 [bismuth ferrite] nanoparticles and tetragonal film, Bi1-xNdxFeO3 [neodymium doped bismuth ferrite], α-Fe2O3 [hematite], Ni3V2O8 [nickel vanadate], and RIn1-xMnxO3 [manganese doped rare earth indium oxide]. …
Characterization Techniques And Electrolyte Separator Performance Investigation For All Vanadium Redox Flow Battery, Zhijiang Tang
Characterization Techniques And Electrolyte Separator Performance Investigation For All Vanadium Redox Flow Battery, Zhijiang Tang
Doctoral Dissertations
The all-vanadium redox flow battery (VRFB) is an excellent prospect for large scale energy storage in an electricity grid level application. High battery performance has lately been achieved by using a novel cell configuration with advanced materials. However, more work is still required to better understand the reaction kinetics and transport behaviors in the battery to guide battery system optimization and new battery material development. The first part of my work is the characterization of the battery systems with flow-through or flow-by cell configurations. The configuration difference between two cell structures exhibit significantly different polarization behavior. The battery output can …
Time Dependent Density-Functional Theory - Linear Response, Bryan Edman Sundahl
Time Dependent Density-Functional Theory - Linear Response, Bryan Edman Sundahl
Masters Theses
The formal derivation of the linear response of time-dependent density-functional theory as shown by E. K. U. Gross is presented. The transformation of formal theory to the working linear response equations in the form of Casida's eigenvalue equation is demonstrated, and the results are applied to small monatomic, diatomic and triatomic systems. The application of different operators to the perturbed density is discussed, with the most attention being given to the dynamic polarizabilities. The dynamic polarizabilities and excitation spectra for N2 [nitrogen gas] are then analyzed. The first excitation energy is noted to be in line with Koopmans' theorem. …
Hindered Rotation Of Dihydrogen On Synthesized Metal Oxides, George Houston Rouvelas
Hindered Rotation Of Dihydrogen On Synthesized Metal Oxides, George Houston Rouvelas
Masters Theses
A MATLAB program was written to calculate the hindered rotational energies of the hydrogen and deuterium molecules interacting with an anisotropic potential, which may be thought of as a potential energy surface of a metal oxide substrate. It was found that an increase in the hindering potential of the rotation about the azimuthal angle lifted the degeneracy of the j = 1,mj [magnetic quantum number] = plus or minus 1 states. A better understanding of how the rotational states of these systems change as a function of the hindering potential can help to explain features in rotational inelastic neutron scattering …
Fluorescence Spectroscopy With Correlated Atomic Force Microscopy Of Gold Nanoparticles And Meso-Scale Ribbons, Meredith Marie Therrien
Fluorescence Spectroscopy With Correlated Atomic Force Microscopy Of Gold Nanoparticles And Meso-Scale Ribbons, Meredith Marie Therrien
Doctoral Dissertations
Studies on the optical properties of gold nanoparticles are of great interest due to the size and shape control and easy adaptability through functionalization to most any application, everything from nanomedicine to nanosensing. Gold nanoparticle optical properties change with size, morphology, and environment. Gold nanospheres were explored to determine the effect of environmental change, from many particles in solution to a single particle immobilized and in air, on fluorescence peak position. A statistical distribution of single gold nanorod fluorescence spectra demonstrate the spectral changes associated with slight variations in size. In solution, gold nanorods self-absorb and only exhibit bulk gold …
Resonance Hyper-Raman Characterization Of Nonlinear Chromophores, Christopher Bennett Milojevich
Resonance Hyper-Raman Characterization Of Nonlinear Chromophores, Christopher Bennett Milojevich
Doctoral Dissertations
Hyper-Raman spectroscopy is a nonlinear optical probe which can be used to explore the multi-photon properties of molecules. Three studies are presented in this dissertation. The first study is a combined experimental investigation of the surfaceenhanced hyper-Raman scattering with a theoretical study of the electronic states of the Rhodamine 6G molecule. This study demonstrates that hyper-Raman spectroscopy can be used to probe electronic states which are one-photon inaccessible. The second study involves a comparison of experimentally measured resonance hyper-Raman spectra to first-principles calculations of the resonance hyper-Raman scattering. This study shows the utility of coupling hyper-Raman spectroscopy and hyper-Raman calculations …
Alkane Adsorption On Mgo(100): Volumetric Isotherm, Inelastic Neutron Scattering, And Computational Studies, Andrew Spencer Hicks
Alkane Adsorption On Mgo(100): Volumetric Isotherm, Inelastic Neutron Scattering, And Computational Studies, Andrew Spencer Hicks
Doctoral Dissertations
Volumetric adsorption isotherms and computational molecular dynamics (MD) simulations were performed for nonane and decane adfilms on MgO(100) nanocubes. From the isotherms, variety of thermodynamic quantities are calculated. These values, along with visual inspection of the isotherms, indicate a layer by layer trend from 2D to 3D behavior. This is attributed to the increasing importance of vertical adsorbate-adsorbate interactions as distance from the surface increases. Additionally, a 2D phase transition is observed for the first adsorbed layer as indicated by the evolution of the widths of the isotherm first derivative peaks. These experimental results are complemented by the MD calculations, …
Synthesis Of Isotopologues And Nanoparticles For Hyper Raman Spectroscopy, Burton K. Mandrell
Synthesis Of Isotopologues And Nanoparticles For Hyper Raman Spectroscopy, Burton K. Mandrell
Chancellor’s Honors Program Projects
No abstract provided.