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 30 for “"domain sizes"”.
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Solid state NMR for advanced materials characterization
… represents an established method to investigate domain sizes and morphology of heterogeneous polymers. General analytical solutions were for the first time derived for an one-dimensional process in a model morphology system represented by three different domains with arbitrary sizes, …
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Niobium-Tantalum Superlattices Grown by Molecular Beam Epitaxy: Structure, Transport, and Superconducting Properties
… time, electronic mean free paths and crystal domain sizes were much larger than the imposed wavelength in metallic superlattices. X-ray structure factor determinations of superlattices grown in four different crystal orientations found that interfacial alloying was strongly direction …
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Structure and Dynamics of Thermotropic Liquid Crystalline and Solid Phases of Sodium Alkanoates (Nmr)
… microscopy, and X-ray diffraction. The domain sizes, ('23)Na spin-lattice relaxation times T(,1), and the ('23)Na quadrupolar coupling constants (QCC) in neat phase sodium 3- and 4-methylpentanoates are compared with results in other short-chain sodium alkanoates. The magnitude of the …
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Electrical noise studies of the re-entrant spinglass nickel-manganese
… noise arising from the dynamics of ferromagnetic domains and domain walls is considered. The noise provides several examples of two-level systems that reveal the ferromagnetic structure and dynamics in different ranges of temperatures and domain sizes."
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Quantifying Spatio-Temporal Chaos in Rayleigh Bénard Convection
… Bénard convection (RBC) in a cylindrical domain with experimentally realistic boundaries was investigated numerically. The results were obtained using large-scale parallel calculations. The flow field was determined as well as its linearized solutions in order to obtain Lyapunov …
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Advanced NMR analysis of polymers and biomolecules
… the number of Nobel awards given to a specific domain in science. Nuclear magnetic resonance has thirteen Nobel awards, the last three ones being given in the last twenty years. Over the years NMR undertook many applications, becoming one of the most versatile, non-invasive methods for …
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Understanding and Optimising Carbon Disorder for High-Performance Supercapacitors
… disordered carbons with smaller graphene-like domain sizes exhibit higher capacitances. Raman spectroscopy, a conventional probe of local structural disorder in nanoporous carbons, is used to test the disorder-driven capacitance theory. Nanoporous carbons with lower ID/IG ratios and broader D …
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TEM/EDXS studies of phase separation in block and graft copolymers
… between molecular parameters and microdomain formation of a variety of block- and graft-copolymers were studied by Transmission Electron Microscopy (TEM). Molecular variables included chemical composition: dimethyl-, fluoropropyl and diphenyl-siloxane , sulfone styrene, …
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Structure-property relationship of aliphatic segmented poly(ester amide)s
… series, mainly ester groups formed the hard domains and only at very high amide content, ester-amide co-crystallization was observed. FT-IR analyses revealed that the PEAs crystallize mainly in the alpha-form found in even-even nylons and the chains are bridged via hydrogen bonds. Morphology …
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Magnetic domain formation in La1-xSrxMnO3 nanowires studied with resonant soft x-ray scattering
… To serve this purpose, we studied magnetic domain formation in La(1-x)Sr(x)MnO3 (LSMO) nanowires. In theory, a 1D ferromagnetic wire is not capable of forming a single domain without an applied field. Therefore, it is meaningful to study how the spatial confinement contributes towards …
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Determining the role of charges in ionic polymer blend systems
… Such a phenomenon would be ideal for tuning domain sizes or obtaining nontraditional structures in materials. One of the two studies presented in this thesis focuses on the crystallization kinetics in a crystalline-crystalline polymer blend, to better understand how to tune the number density …
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Self assembly of block copolymers : applicability in microelectronics and gains for patterned media
… will microphase separate into individual domains due to unfavorable mixing enthalpy. These microphase-separated blocks can have domain sizes of very low dimensions, to the order of 15-20 nms. By careful preparation, microphase-separated thin films of immiscible block copolymers can act as …
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Donor-Acceptor Block Copolymers for Charge Separation at Nanostructured Interfaces
… copolymers exhibit microphase separation with domain sizes on a nanometer scale by the interplay between immiscibility and molecular connectivity. I used a controlled radical polymerization technique, the nitroxide mediated radical polymerization (NMRP), to get block copolymers with one block …
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Donor-Acceptor Block Copolymers in Organic Electronics - Spectroscopy, Charge Transport, Morphology and Device Application
… a strongly reduced photoluminescence, suggesting domain sizes of only some nanometres. Although efficient charge separation could be accomplished, a good charge percolation was lacking due to small domain sizes. Furthermore the herein presented results emphasis the fundamental importance of …
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Siloxane modified hybrid materials by the sol-gel process
… due to the variation in the cure modes. The domain sizes of the oxide phase were finer in the thermally cured as compared to the room temperature cured materials. Higher water content led to a very different microstructure when compared to materials made with lower water content. Smaller …
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Morphologies of PDMS-containing diblock polymers
… of several times their repeat period. The small domain sizes achievable with and technological relevance of PDMS-containing diblocks make them ideal for use in microelectronics and information storage which provides a motivation for exploring this topic further.
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CU-CATALYZED CHEMICAL VAPOUR DEPOSITION OF GRAPHENE: SYNTHESIS, CHARACTERIZATION AND GROWTH KINETICS
… films under safe conditions, visualizing the domain boundaries of the continuous graphene, and understanding the kinetic features of the Cu-CVD process. This thesis presents the research aiming at these three objectives. By optimizing the Cu pre-treatments and the CVD process parameters, …
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Modeling Electromagnetic Wave Propagation in Electrically Large Structures
… the validity of the FDTD method for modest domain sizes ([5λ^3]) and number of Monte Carlo realizations (32). The method is used to illustrate a penetrating sphere model, which is not possible with existing analysis techniques. Backscatter from the resulting model is about 3 times higher …
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Magnetic and Spintronic Properties of Rare-Earth Iron Garnets
… due to record-breaking spin orbit torque-driven domain wall velocities over 2km/s and the presence of the Dzyaloshinskii-Moriya interaction, which stabilizes chiral Néel domain walls. In order to optimize REIG for these applications, it is useful to develop methods for tuning their magnetic and …
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Geometric Design Methods for Conducting Solids Cooled by Conjugate Heat Transfer Including Surface Radiation
… is applied to a range of solid emissivities and domain sizes. It is found that radiation has a significant influence on the thermal behavior (fluid flow and temperature distribution) and therefore on the predicted optimal solid shapes. In general, increasing the strength of radiation results in …
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