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 28 for “"Disordered materials"”.
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Investigating Quantum Processes in Disordered Materials
… this knowledge to technologies based on real materials such as transistors, light emitting diodes and solar cells. The central impediment to this is that real materials are disordered; characterised by crystalline imperfections, atomic vibrations and amorphous microstructures. The effect of …
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High pressure NMR studies of disordered materials
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-13T14:47:11Z No. of bitstreams: 1 1983_marinos.pdf: 4641728 bytes, checksum: 2d590e26df28e78f93df6c10fa9673ca (MD5)
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Nanoscale thermal and thermoelectric energy transport in crystalline and disordered materials
… energy transport in crystalline and disordered materials, especially about how the energy transport depends on atomistic level details such as chemical bondings. Specifically, we will discuss three examples.
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Diffraction Between the Spots: Scanning Electron Diffraction of Beam-sensitive Disordered Materials
Crystallography loves order, but many organic materials are disordered and only partially, if at all, crystalline. Nonetheless, these disordered materials are functionally complex and require characterisation. Their lack of crystallinity poses not only fundamental questions about how to best …
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Extending first principles spectroscopy to disordered materials: a study on amorphous and crystalline aluminas
Advancing the next generation of materials for solid-state devices requires an understanding of their underlying electronic structure; yet the disordered nature of many materials hinders progress in creating an atomic-level model. Although X-ray diffraction (XRD) is used to match crystalline models …
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Application of Radial Distribution Functions to Diffraction and Imaging Data: Interfacial Structures, Amorphous, Disordered Materials
… and pair distribution function analysis to materials characterisation problems for nanotechnology. These concepts are introduced in Chapter 1, and the associated methods are described in Chapter 2. Chapter 3 details the first of the results which discusses the design and development of a …
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Defects and Rearrangements in Disordered Solids
… thesis, I will investigate the properties of disordered materials under strain. Disordered materials encompass a large variety of materials, including glasses, polymers, granular matter, dense colloids, and gels. There is currently no constitutive equation based on microscopic observables that …
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Microscopic Theory of Linear Response in Amorphous Materials
… to study dielectric and mechanical properties of disordered materials, as well as non-centrosymmetric crystals. The Caldeira-Leggett Hamiltonian opens a route to the (both Markovian and nonMarkovian) fluctuation-dissipation theorem (FDT) and gives rise to the generalised Langevin equation (GLE) in …
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"“Phonon"" and electron transport in glass-crystal dual materials"
… a long-standing driver across all sectors of materials engineering, ranging from energy and transportation, to electronics and communications, and to biomedicine and environment. Disorder engineering has focused primarily on tuning its spatial configuration and distribution to establish …
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Anderson Localization in Low-Dimensional Systems with Long-Range Correlated Disorder
… on-going work related to novel two-dimensional disordered materials where random spin-orbit interactions are predicted to cause suppressed spin transport.
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Glassy models of protein folding
… thesis we have used concepts from the physics of disordered materials to study protein folding. The first chapter consists of a general introduction to proteins and protein folding. In Chapter Two we develop a simple protein folding model and use a random energy approximation to calculate its …
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Fluctuation Electron Microscopy of Medium-Range Order in Amorphous Silicon
… technique for studying medium-range order in disordered materials. We compute the variance for the image intensity of low-resolution hollow-cone dark field electron micrographs as a function of the diffracting condition and microscope resolution. The variance is sensitive to fluctuations in …
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Avalanches, percolation, and stochastic damage evolution in disordered media
Disordered materials are ubiquitous in nature and engineering. The physical properties of such random heterogeneous materials are strongly coupled with the strength and spatial distribution of the disorder. Disorder leads to fluctuations in material properties which become relevant for mesoscales …
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Harmonic and Supercontinuum Generation in Zinc-Blende Materials
… transparency window in the MIR, zinc-blende materials in their polycrystalline form are uniquely suitable for extremely broadband harmonic and supercontinuum generation. This dissertation reports on the development of numerical methods for simulating light-matter interactions in …
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Atomistic modeling of mixed ion/electron conductors exhibiting configurational disorder: Application to iron-substituted strontium titanate
In instances where materials exhibit substantial disorder, obtaining accurate, quantitative descriptions of functional properties from modeling and simulation remains a longstanding challenge. While computational methods are more well-established for ordered, crystalline materials, it is not …
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Adapting a Cryogen-Free Measurement System for Geological Materials: Method Development for Thermal Conductivity Measurements Below 300 K with Applications to Planetary Science
… Despite being composed mainly of crystalline materials, phonon transport is suppressed by porosity and grain boundaries, resulting in thermal conductivity trends similar to disordered materials. These factors also drive anisotropy due to structural heterogeneity. The results of this study …
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Electrical characterization of organic devices: case study: polythiophene-fullerene based solar cells
… activated transport mechanism, characteristic to disordered materials. This result explains the specific feature of organic solar cells to operate better in a warm climate, rather than at low temperatures, a totally different behaviour compared to conventional inorganic solar cells. The origin of …
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Unearthing the Anticrystal: Criticality in the Linear Response of Disordered Solids
The fact that a disordered material is not constrained in its properties in the same way as a crystalline one presents significant and yet largely untapped potential for novel material design. However, unlike their crystalline counterparts, disordered solids are not well understood. Though …
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Exciton transport and coherence in molecular and nanostructured materials
… past 20 years a new classes of optically active materials have been developed that are composites of nano-engineered constituents such as molecules, polymers, and nanocrystals. These disordered materials have enabled devices such as organic light emitting diodes, color tunable lasers, and …
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Theoretical Investigations of the Photophysical Properties of Chromophoric Metal-Organic Frameworks
… give rise to drastic differences with respect to disordered materials. Distinct band features lead to photo-effect, and the band structure can be tuned to optimize the performance of the photovoltaic (PV) device. An example is the presence of an indirect band gap. For organic semiconductors, such …
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