Relevant bibliographies by topics / Physics, Condensed Matter. Chemistry, Inorganic / Dissertations / Theses
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Dissertations / Theses on the topic 'Physics, Condensed Matter. Chemistry, Inorganic'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 February 2022

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1

Russell, David D. "Design, synthesis, crystal structure and magnetic properties of novel osmium-based B-site ordered double perovskites." Thesis, California State University, Long Beach, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10011271.

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<p>Transition metal oxides (TMOs) with face centered cubic arrangement of magnetic ions are composed of triangular sub-lattices. When antiferromagnetic (AFM) interactions of the same strengths between all three pathways in triangular settings are in place, spin constraints cannot be fulfilled simultaneously and the system undergoes geometric magnetic frustration (GMF). The purpose of the work presented in this thesis is to better understand the criteria for a system to undergo GMF. To achieve this, the novel B-site ordered double perovskites Ca2ScOsO6 and Ca2.2Mg0.8OsO6 were synthesized in
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2

Chilkunda, Raghunath 1965. "Fundamental aspects of particulate contamination of tungsten and thermal oxide wafers during chemical-mechanical polishing." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/282301.

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Chemical-mechanical polishing (CMP) has emerged as a new processing technique for achieving a high degree of planarity (< 10 μm) for submicron devices in very large scale integrated (VLSI) process technology. Metal as well dielectic films can be planarized using CMP. Polishing of tungsten (W) and interlayer dielectric (SiO₂) films is carried out using alumina (Al₂O₃) based slurries which typically contain acids, complexing and oxidizing agents. One of the challenges of CMP is the effective removal of slurry particles (e.g., Al₂O₃) that are deposited on the wafer (e.g., W) surface during polish
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3

Liska, Tadeas. "Bis(imidazolyl)carbazolide Platinum(II) Alkynyls: Synthesis, Characterization, and Photophysical Properties." Case Western Reserve University School of Graduate Studies / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=case1626960987919156.

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4

Lai, Chung-Chuan. "Phase Formation of Nanolaminated Transition Metal Carbide Thin Films." Doctoral thesis, Linköpings universitet, Tunnfilmsfysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-137367.

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Research on inherently nanolaminated transition metal carbides is inspired by their unique properties combining metals and ceramics, such as higher damage tolerance, better machinability and lower brittleness compared to the binary counterparts, yet retaining the metallic conductivity. The interesting properties are related to their laminated structure, composed of transition-metalcarbide layers interleaved by non-transition-metal (carbide) layers. These materials in thin-film form are particularly interesting for potential applications such as protective coatings and electrical contacts. The
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5

Oropeza, Palacio Freddy Enrique. "Electronic structure of TiO2-based photocatalysts active under visible light." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:dec3cf2c-f14b-40b1-b85a-c0c09d04d15b.

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This thesis is concerned with furthering our understanding of the basis of visible region photocatalytic activity exhibited by doped TiO2-based materials. A range of experimental techniques including high resolution X-ray photoemission spectroscopy and diffuse reflectance spectroscopy are used to investigate electronic structure and an attempt is made to link these results to the observed photocatalytic activity. Both anionic (N) and cationic (Rh and Sn) dopants are investigated. [See pdf file for full abstract].
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6

Seel, Andrew G. "Incoherent neutron scattering studies of select inorganic systems : I. Nuclear momentum measurements of multiple masses, II. The dynamics of coordinated ammonia in zeolite A." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:48e7a487-b203-46d6-9bb3-2866b1d98f1b.

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Spectroscopic measurements are detailed within this thesis, utilising incoherent neutron scattering to examine the dynamics of various condensed-matter systems, from nanosecond to sub-femtosecond timescales. The body of this work is divided into two distinct areas of research. I. Nuclear Momentum Measurements of Multiple Masses Deep inelastic neutron scattering (DINS) is used to probe the nuclear momentum distributions and kinetic energies of individual atomic species in sodium hydride (both in bulk and as nanoparticulates within a silica matrix), enriched lithium-7 fluoride and lithium tetra-
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7

Blades, William H. "Electronic Structure and Stability of Ligated Superatoms and Bimetallic Clusters." VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4292.

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Quantum confinement in small metal clusters leads to a bunching of states into electronic shells reminiscent of shells in atoms. The addition of ligands can tune the valence electron count and electron distribution in metal clusters. A combined experimental and theoretical study of the reactivity of methanol with AlnIm− clusters reveals that ligands can enhance the stability of clusters. In some cases the electronegative ligand may perturb the charge density of the metallic core generating active sites that can lead to the etching of the cluster. Also, an investigation is conducted to unde
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8

Mishra, Rohan. "First Principles Study of Double Perovskites and Group III-V Compounds." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1345489862.

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9

Parkinson, Patrick. "Ultrafast electronic processes at nanoscale organic-inorganic semiconductor interfaces." Thesis, University of Oxford, 2009. http://ora.ox.ac.uk/objects/uuid:e68168c6-bcc0-437d-9133-1bfaf955c80a.

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This thesis is concerned with the influence of nanoscale boundaries and interfaces upon the electronic processes that occur within both organic and inorganic semiconductors. Photoluminescent polymers, highly conducting polymers and nanoscale inorganic semiconductors have been investigated using state-of-the-art ultrafast optical techniques, to provide information on the sub-picosecond photoexcitation dynamics in these systems. The influence of dimensionality on the excitation transfer dynamics in a conjugated polymer blend is studied. Using time-resolved photoluminescence spectroscopy, the tra
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10

Clifford, Dustin M. "Non-Conventional Approaches to Syntheses of Ferromagnetic Nanomaterials." VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4205.

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The work of this dissertation is centered on two non-conventional synthetic approaches to ferromagnetic nanomaterials: high-throughput experimentation (HTE) (polyol process) and continuous flow (CF) synthesis (aqueous reduction and the polyol process). HTE was performed to investigate phase control between FexCo1-x and Co3-xFexOy. Exploration of synthesis limitations based on magnetic properties was achieved by reproducing Ms=210 emu/g. Morphological control of FexCo1-x alloy was achieved by formation of linear chains using an Hext. The final study of the FexCo1-x chains used DoE to determ
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11

Aeberhard, Philippe C. "Computational modelling of structure and dynamics in lightweight hydrides." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:bfaf28b1-da03-4ce9-8577-5e8c18eb05ae.

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Hydrogen storage in lightweight hydrides continues to attract significant interest as the lack of a safe and efficient storage of hydrogen remains the major technological barrier to the widespread use of hydrogen as a fuel. The metal borohydrides Ca(BH₄)₂ and LiBH₄ form the subject of this thesis; three aspects of considerable academic interest were investigated by density functional theory (DFT) and molecular dynamics (MD) modelling. (i) High-pressure crystal structures of Ca(BH₄)₂ were predicted from a structural analogy between metal borohydrides and isoelectronic metal oxides. The structur
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12

Qi, Tongfei. "MAGNETIC AND ORBITAL ORDERS COUPLED TO NEGATIVE THERMAL EXPANSION IN MOTT INSULATORS, CA2RU1-XMXO4 (M = 3D TRANSITION METAL ION)." UKnowledge, 2012. http://uknowledge.uky.edu/physastron_etds/6.

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Ca2RuO4 is a structurally-driven Mott insulator with a metal-insulator (MI) transition at TMI = 357K, followed by a well-separated antiferromagnetic order at TN = 110 K. Slightly substituting Ru with a 3d transition metal ion M effectively shifts TMI and induces exotic magnetic behavior below TN. Moreover, M doping for Ru produces negative thermal expansion in Ca2Ru1-xMxO4 (M = Cr, Mn, Fe or Cu); the lattice volume expands on cooling with a total volume expansion ratio reaching as high as 1%. The onset of the negative thermal expansion closely tracks TMI and TN, sharply contrasting classic neg
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13

Gharavi, Mohammad Amin. "Nitride Thin Films for Thermoelectric Applications : Synthesis, Characterization and Theoretical Predictions." Licentiate thesis, Linköpings universitet, Tunnfilmsfysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-136533.

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Thermoelectrics is the reversible process which transforms a temperature gradient across a material into an external voltage through a phenomenon known as the Seebeck effect. This has resulted in niche applications such as solid-state cooling for electronic and optoelectronic devices which exclude the need for a coolant or any moving parts and long-lasting, maintenance-free radioisotope thermoelectric generators used for deep-space exploration. However, the high price and low efficiency of thermoelectric generators have prompted scientists to search for new materials and/or methods to improve
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14

Liyanage, Geethika Kaushalya. "Infrared Emitting PbS Nanocrystals through Matrix Encapsulation." Bowling Green State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1403953924.

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15

Zhang, Kelvin Hongliang. "Structural and electronic investigations of In₂O₃ nanostructures and thin films grown by molecular beam epitaxy." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:de125918-b36f-47cc-b72d-2f3a27a96488.

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Transparent conducting oxides (TCOs) combine optical transparency in the visible region with a high electrical conductivity. In2O3 doped with Sn (widely, but somewhat misleadingly, known as indium tin oxide or ITO) is at present the most important TCO, with applications in liquid crystal displays, touch screen displays, organic photovoltaics and other optoelectronic devices. Surprisingly, many of its fundamental properties have been the subject of controversy or have until recently remained unknown, including even the nature and magnitude of the bandgap. The technological importance of the mat
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16

Regoutz, Anna. "Structural and electronic properties of metal oxides." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:6f425890-b211-4b35-b438-b8de18f7ae64.

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Metal oxides are of immense technological importance. Their wide variety of structural and electronic characteristics leads to a flexibility unrivalled by other groups of materials. However, there is still much debate about the fundamental properties of some of the most widely used oxides, including TiO<sub>2</sub> and In<sub>2</sub>O<sub>3</sub>. This work presents high quality, in-depth characterisation of these two oxides in pure and doped form, including soft and hard X-ray photoelectron spectroscopy and X-ray diffraction. Bulk samples as well as thin film samples were prepared analysed. F
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17

Beaver, Nathaniel Morck. "In situ XAS of Molybdenum Dichalcogenides as Li-Ion Battery Anodes." Thesis, Illinois Institute of Technology, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10680750.

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<p> Due to high specific capacity for lithiation, molybdenum dichalcogenides such as MoO<sub>2</sub> and MoS<sub>2</sub> are potential replacements for graphite anodes in Li-ion batteries. However, in bulk form these materials exhibit poor rate capability and lose capacity with each cycle. While the performance can be improved by changes to morphology, the details of the lithium intercalation mechanism are not fully understood. </p><p> In this work, X-ray absorption spectroscopy (XAS) is employed to investigate this mechanism, including X-ray absorption near-edge spectroscopy (XANES) and X-r
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18

Das, Ujjal. "Electronic structure studies of semiconductor surface chemistry and aluminum oxide cluster chemistry." [Bloomington, Ind.] : Indiana University, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3344570.

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Thesis (Ph. D.)--Indiana University, Dept. of Chemistry, 2008.<br>Title from PDF t.p. (viewed Oct. 7, 2009). Source: Dissertation Abstracts International, Volume: 70-02, Section: B, page: 1054. Adviser: Krishnan Raghavachari.
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19

Volkov, Anton. "Ionic and electronic transport in electrochemical and polymer based systems." Doctoral thesis, Linköpings universitet, Fysik och elektroteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-135429.

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Electrochemical systems, which rely on coupled phenomena of the chemical change and electricity, have been utilized for development an interface between biological systems and conventional electronics.  The development and detailed understanding of the operation mechanism of such interfaces have a great importance to many fields within life science and conventional electronics. Conducting polymer materials are extensively used as a building block in various applications due to their ability to transduce chemical signal to electrical one and vice versa. The mechanism of the coupling between the
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20

Xu, Chen. "Advanced Topographic Characterization of Variously Prepared Niobium Surfaces and Linkage to RF Losses." W&M ScholarWorks, 2013. https://scholarworks.wm.edu/etd/1539623621.

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Superconducting radio frequency (SRF) technology is widely adopted in particle accelerators. The shallow penetration (∼ 40 nm) of the RF into superconducting niobium lends great importance to SRF cavity interior surface chemistry and topography. These in turn are strongly influenced by the chemical etching "surface clean-up" that follows fabrication.;The principal surface smoothing methods are buffered chemical polish (BCP) and electropolish (EP). The resulting topography is characterized by atomic force microscopy (AFM). The power spectral density (PSD) of AFM data provides a more thorough de
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21

Yao, Jian Hua. "Theory of Ostwald ripening." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=39401.

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This thesis presents a theoretical approach to Ostwald ripening of droplets in arbitrary dimensions. A mean-field theory is constructed to incorporate screening effects among the competing droplets. The mean-field equations are solved to all orders in the volume fraction to provide analytic expressions for the coarsening rate, the droplet distribution function, and the time-dependent droplet number. These results are in agreement with experiments in three-dimension and with very large scale and extensive numerical studies in both two and three dimensions undertaken in this thesis. The numerica
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22

Soga, K. Geoffrey (Kenneth Geoffrey). "Equilibrium phase separation in polymer brushes." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40445.

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The equilibrium properties of polymers end-grafted to an impenetrable interface, the "polymer brush", are investigated. Relevant concepts and techniques of statistical polymer physics are discussed; in particular, a simulation technique that is very efficient for studying polymer brushes is introduced. This technique is demonstrated through simulations of a well characterized polymer brush system. The results of original investigations of phase separation in polymer brushes are also presented. An instability in the lateral monomer density of a polymer brush is observed under sufficiently poor
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23

Zhang, Zhengping 1957. "Numerical studies of phase behavior in thermotropic and lyotropic liquid crystals." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41132.

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This thesis presents numerical studies of phase behavior for both thermotropic and lyotropic liquid crystals. The nature of the orientational transition in the Lebwohl-Lasher model for the nematic-isotropic phase transition is found to be weak first-order with the stability limits of the nematic and isotropic phases being extremely close to the equilibrium transition temperature. It is also found that the director fluctuations in the nematic phase correspond to fractional Brownian motion whereas the fluctuations in the isotropic phase follow ordinary Brownian motion. The Pink model is extended
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24

Iyer, Venkatraman 1967. "Discretized path integral molecular dynamic simulations with quantum exchange of two electrons in molten potassium chloride." Thesis, The University of Arizona, 1992. http://hdl.handle.net/10150/278142.

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This study presents the use of Feynman's Quantum Path Integral (QPI) approach in the Molecular Dynamic Simulation of two electrons in molten KCl. In this research, we have successfully implemented an original technique to tackle the questions of spin dependent quantum exchange phenomenon between two electrons. It was found that two electrons with antiparallel spins form a stable bipolaronic complex and those with parallel spins repel each other and form two dissociated or singlet states. Calculations of the average energies compare well with previous computational findings by Selloni et al. wh
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25

Wang, Cheng-Zhang. "First principles linear response calculations of lattice dynamics." W&M ScholarWorks, 1995. https://scholarworks.wm.edu/etd/1539623874.

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First principles calculations, using the density-functional theory and particularly the local density approximation (LDA), have achieved remarkable success in studying the properties of solid state systems. Although the basic results of these calculations are the electronic structures (eigenvalues, eigenfunctions, etc.) and the total energy of ground state, many other related physical properties can be deduced from them by investigating their response under external perturbations. Using the linear response method with linearized-augmented-plane-wave (LAPW) basis, we have calculated lattice dyn
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26

Baugher, April Heather. "Microstructural characterization of an ultra-high-performance polyimide." W&M ScholarWorks, 1997. https://scholarworks.wm.edu/etd/1539623895.

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The motivation for this study was to further characterize a relatively new high-temperature polymer for application as a matrix resin for carbon fiber composites. The two primary questions addressed in this study dealt with the structural and chemical changes occurring in these polymers on exposure to high temperature.;To investigate the structural changes in the heat-treated samples, a positron annihilation lifetime spectrometer was designed, built and optimized. Because the lifetime of a positron in a material reflects the electronic structure of the material in which it annihilates, measure
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27

Wallace, Matthew L. "The rigidity transition in a short-chain polymer glass." Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/26794.

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In this thesis, we present a thorough investigation into the rigidity of a polymer melt above and below its glass transition (GT) at a temperature TG = 0.465 (in reduced Lennard-Jones units). We use an isothermal-compression method to enter the glassy phase and NPT ensemble is realized through molecular dynamics simulations. We monitor such quantities as the mean-square displacement, the heat capacity CP, the volume and time-dependent shear modulus G(t). Whenever possible, these quantities are monitored below the GT as well. We also compute the shear modulus mu via external deformations and,
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28

Green, Timothy Frederick Goldie. "Prediction of NMR J-coupling in condensed matter." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:39ee4a7c-58f9-49fa-b14c-16bc03141e53.

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Nuclear magnetic resonance (NMR) is a popular spectroscopic method and has widespread use in many fields. Recent developments in solid-state NMR have increased interest in experiment and, alongside simultaneous developments in computational theory, have led to the field dubbed 'NMR crystallography.' This is a suite of methodologies, complementing the capabilities of other crystallographic methods in the determination of atomic structure, especially when large crystals cannot be made and when exploring materials with phenomena such as compositional, positional and dynamic disorder. NMR J-coupli
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Jarka, Frederick William 1961. "Electro-absorption measurements and optical nonlinearities of DCH polydiacetylene." Thesis, The University of Arizona, 1991. http://hdl.handle.net/10150/277976.

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Theoretical calculations have predicted the importance of two-photon absorptions in the third order optical nonlinearities of polydiacetylenes. We have used electro-absorption techniques to make these two-photon transitions slightly one-photon allowed and therefore observable in the one-photon absorption spectrum. Our findings, although unable to ascertain the existence of below-gap two-photon states, nevertheless provide an unexpected view of the conduction band in conjugated chain polymers. The observation of a field induced oscillatory change in the absorption around the vicinity of the ban
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30

Forsythe, Martin Blood Zwirner. "Advances in Ab Initio Modeling of the Many-Body Effects of Dispersion Interactions in Functional Organic Materials." Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:26718708.

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Accurate treatment of the long-range electron correlation energy, including dispersion interactions, is essential for describing the structure, dynamics, and function of a wide variety of systems. Among the most accurate models for including dispersion into density functional theory (DFT) is the range-separated many-body dispersion (MBD) method [A. Ambrosetti et al., J. Chem. Phys. 2014, 140, 18A508], in which the long-range correlation energy is computed from a model system of coupled quantum harmonic oscillators. In this work, we seek to extend the applicability of the MBD model by developi
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31

Guo, Xiaoming. "Manganese-Bismuth prepared by rapid solidification." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=39567.

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The low temperature phase (LTP) of MnBi, an interesting material with large magnetic anisotropy, has been obtained for the first time in bulk quantities in almost single-phase form ($>$95$ sp{wt}$%) by melt-spinning, followed by annealing.<br>X-ray, electron microscope and differential scanning calorimetry (DSC) studies indicate that the melt-spun MnBi is amorphous, and may be phase separated. A mechanism is suggested for the glass formation in MnBi. Upon heating, amorphous MnBi first crystallizes around 440 K, then forms LTP around 540 K. DSC and thermomagnetometry studies show that the LTP t
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Shaheen, Sean E. "Device physics of organic light-emitting diodes." Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/289012.

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This work investigated several aspects of OLED device physics. The mechanisms responsible for the efficiency enhancement typically seen when a dye molecule is doped into the emission layer were examined. By comparing the spectra and efficiencies of single-layer devices for varying dopant concentrations, it was found that both charge transfer and energy transfer from the host molecule to the dye dopant are important processes. The measured efficiencies for photoluminescence and electroluminescence were found to be consistent with a simple model developed to explain the functional dependence on
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Bernstein, Lisa Joan. "Quantum theories of self-localization." Diss., The University of Arizona, 1991. http://hdl.handle.net/10150/298722.

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In the classical dynamics of coupled oscillator systems, nonlinearity leads to the existence of stable solutions in which energy remains localized for all time. Here the quantum-mechanical counterpart of classical self-localization is investigated in the context of two model systems. For these quantum models, the terms corresponding to classical nonlinearities modify a subset of the stationary quantum states to be particularly suited to the creation of nonstationary wavepackets that localize energy for long times. The first model considered here is the Quantized Discrete Self-Trapping model (Q
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Fry, Taylor D. "Metallophthalocyanine Optical Properties Dependence on Grain Size." Thesis, California State University, Long Beach, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10838499.

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<p> Vacuum sublimated thin films of metallophthalocyanines (where metal = Cu, Fe, Zn, and Mn) and metal-free phthalocyanine were prepared at different deposition temperatures. The optical properties have been studied in the wavelength range of 340 nm to 2500 nm for samples deposited at room temperature up to 250 &deg;C. Atomic force microscopy was used to obtain images of the surface morphology. Absorption coefficient spectra obtained verify the &pi; to &pi;* transition in the region 526 nm to 735 nm for the Q band, throughout all samples studied. The independence of deposition temperature or
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Brauer, Stephan F. "The kinetics of rapid crystallization of metallic glasses." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=39382.

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Time-resolved x-ray scattering has been used to study the kinetics of polymorphic crystallization of amorphous metals on time-scales varying from minutes to milliseconds. Using a high flux synchrotron beamline and fast position-sensitive detector system, simultaneous wide and small angle scattering patterns from the transforming material have been acquired in situ, with time-resolution as short as 3ms. A fast pyrometric temperature controller has been developed to change and regulate the sample temperature with microsecond response. Two alloys have been identified in which crystallization proc
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Dressen, Donald George. "An Investigation of the Interaction Between Graphene and Hydrated Ions." Thesis, Harvard University, 2016. http://nrs.harvard.edu/urn-3:HUL.InstRepos:33493386.

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The ability of graphene and carbon nanotubes to generate an electric potential from flowing fluids has attracted much interest. The effect is thought to occur because certain ionic and molecular species bind to the surface of these materials more strongly than others. Although several physical models have been proposed, none has yet been rigorous enough to be confirmed by experiment. In this work, I describe an electromechanical device, i.e. a supercapacitive electrical energy generator (SCEEG) made with graphene electrodes, that generates electricity from oscillating droplets of electrolyte s
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Manning, Lane Wright. "Excitonic States in Crystalline Organic Semiconductors: A Condensed Matter Approach." ScholarWorks @ UVM, 2016. http://scholarworks.uvm.edu/graddis/571.

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In this work, a new condensed matter approach to the study of excitons based on crystalline thin films of the organic molecule phthalocyanine is introduced. The premise is inspired by a wealth of studies in inorganic semiconductor ternary alloys (such as AlGaN, InGaN, SiGe) where tuning compositional disorder can result in exciton localization by alloy potential fluctuations. Comprehensive absorption, luminescence, linear dichroism and electron radiative lifetime studies were performed on both pure and alloy samples of metal-free octabutoxy-phthalocyanine and transition metal octabutoxy-phthal
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Jarrold, Thomas Furnley. "Single channel Kondo physics in triple quantum dots." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:e2772c4e-6c76-44b8-9c02-401d9f90b27f.

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In this thesis we investigate a system of three tunnel-coupled quantum dots, arranged in a triangular geometry and attached to a single metallic conduction band, using both analytic and semi-analytic methods and the numerical renormalisation group technique. This is the simplest coupled quantum dot system to exhibit frustration. We study three different models of the triple quantum dot device: a mirror symmetric arrangement of dots in which only one dot is connected to the conduction band, a triple quantum dot system in which only one dot is connected to the conduction band without a plane of
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Wu, Kun-Ta. "The Road to Colloidal Self-Replication." Thesis, New York University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3614913.

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<p> Self-replication exists everywhere in nature from bacteria to human beings. Several generations of scientists have worked on self-replication in nature. However, a more challenging breakthrough is to self-replicate through lifeless matter, such as colloids. To accomplish this paradigm shift, technically, we need to investigate thermodynamics, kinetics, multi-functionality, mobility, and the formation of specific covalent bonds of DNA-coated colloids. These are the essential studies for realizing colloidal self-replication. </p><p> We present and experimentally test a mean field thermod
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Goetz, Jon Michael. "A study of molecular order and motion in nematic liquid crystal mixtures." W&M ScholarWorks, 1993. https://scholarworks.wm.edu/etd/1539623842.

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Materials which flow like fluids, but possess anisotropic properties like molecular crystals, are called 'liquid crystals'. Studies of liquid crystals contribute to our understanding of how molecular orientation influences macroscopic properties. This thesis presents experimental and theoretical investigations of molecular order and dynamics in nematic liquid crystal systems. First, deuterium nuclear magnetic resonance is used to determine the degree of orientational order of both components of a liquid crystal mixture simultaneously. The temperature dependence of the four order parameters is
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Lee, Michael M. "Organic-inorganic hybrid photovoltaics based on organometal halide perovskites." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:9384fc54-30de-4f0d-86fc-71c22d350102.

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This thesis details the development of a novel photovoltaic device based on organometal halide perovskites. The initial focus of this thesis begins with the study of lighttrapping strategies in solid-state dye-sensitised solar cells (detailed in chapter 3). While I report enhancement in device performance through the application of near and far-field light-trapping techniques, I find that improvements remain step-wise due to fundamental limitations currently employed in dye-sensitised solar cell technology— notably, the available light-sensitising materials. I found a promising yet under researc
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42

Wu, Yimin A. "Towards large area single crystalline two dimensional atomic crystals for nanotechnology applications." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:bdb827e5-f3fd-4806-8085-0206e67c7144.

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Nanomaterials have attracted great interest due to the unique physical properties and great potential in the applications of nanoscale devices. Two dimensional atomic crystals, which are atomic thickness, especially graphene, have triggered the gold rush recently due to the fascinating high mobility at room temperature for future electronics. The crystal structure of nanomaterials will have great influence on their physical properties. Thus, this thesis is focused on developing the methods to control the crystal structure of nanomaterials, namely quantum dots as semiconductor, boron nitride (B
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Jouzi, Maryam. "Carbon nanotube nanoneedles and their electrical-mechanical-chemical interactions with biological systems." View abstract/electronic edition; access limited to Brown University users, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3318334.

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44

Goddard, Yanina Anatolievna. "Solid state NMR characterization of conductive polyanilines." W&M ScholarWorks, 2004. https://scholarworks.wm.edu/etd/1539623435.

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Different forms of ring deuterated polyaniline with different conductivity have been characterized by solid state deuteron nuclear magnetic resonance.;Quadrupole echo (QE) spectra of all forms of polyaniline consist of a superposition of lineshapes for nearly rigid aromatic rings and a small fraction of rings which undergo fast 180?? flips. The intensity of the fast flipping component is temperature dependent and different for conductive emeraldine salt (ES) and non-conductive emeraldine base (EB). This is a manifestation of the different structure and morphology of these polymers.;Simultaneou
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Mclaughlin, Keith. "Development of Improved Models for Gas Sorption Simulation." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4916.

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Computational chemistry offers one the ability to develop a better understanding of the complex physical and chemical interactions that are fundamental to macro- and mesoscopic processes that are seen in laboratory experiments, industrial processes, and ordinary, everyday life. For many systems, the physics of interest occur at the molecular or atomistic levels, and in these cases, computational modeling and two well refined simulation techniques become invaluable: Monte Carlo (MC) and molecular dynamics (MD). In this work, two well established problems were tackled. First, models and potentia
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Wright, Christopher James. "Theoretical studies of underscreened Kondo physics in quantum dots." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:62207edb-af3a-4340-a6f2-5264b1374a41.

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We study correlated two-level quantum impurity models coupled to a metallic conduction band in the hope of gaining insight into the physics of nanoscale quantum dot systems. We focus on the possibility of formation of a spin-1 impurity local moment which, on coupling to the band, generates an underscreened (USC) singular Fermi liquid state. By employing physical arguments and the numerical renormalization group (NRG) technique, we analyse such systems in detail examining in particular both the thermodynamic and dynamic properties, including the differential conductance. The quantum phase trans
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Mithen, James Patrick. "Molecular dynamics simulations of the equilibrium dynamics of non-ideal plasmas." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:3bae84f9-530d-43da-ad7e-bb9a1784cd1d.

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Molecular dynamics (MD) simulations are used to compute the equilibrium dynamics of a single component fluid with Yukawa interaction potential v(r) = (Ze)^2 exp(−r/λs )/4π eps_0 r. This system, which is known as the Yukawa one-component plasma (YOCP), represents a simplified description of a non-ideal plasma consisting of ions, charge Ze, and electrons. For finite screening lengths λs, the MD results are used to investigate the domain of validity of the hydrodynamic description, i.e., the description given by the Navier-Stokes equations. The way in which this domain depends on the thermodynami
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Hu, Zhonghan. "Transport properties, optical response and slow dynamics of ionic liquids." Diss., University of Iowa, 2007. http://ir.uiowa.edu/etd/160.

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Sanzenbacher, Lindsay M. "Raman Spectroscopic Studies of Single Crystal Diamond." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1313440154.

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50

Alnoor, Hatim. "Toward the Optimization of Low-temperature Solution-based Synthesis of ZnO Nanostructures for Device Applications." Doctoral thesis, Linköpings universitet, Fysik och elektroteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-141753.

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One-dimensional (1D) nanostructures (NSs) of Zinc Oxide (ZnO) such as nanorods (NRs) have recently attracted considerable research attention due to their potential for the development of optoelectronic devices such as ultraviolet (UV) photodetectors and light-emitting diodes (LEDs). The potential of ZnO NRs in all these applications, however, would require synthesis of high crystal quality ZnO NRs with precise control over the optical and electronic properties. It is known that the optical and electronic properties of ZnO NRs are mostly influenced by the presence of native (intrinsic) and impu
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