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 406 for “"Nanostructure"”.
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Fabrication of zein nanostructure
… technique was mainly used to fabricate micro and nanostructures on zein films. Zein material well-replicated small structures with the smallest size at sub micrometer scale that resulted in interesting photonic properties. The bonding method was also developed for assembling portable zein …
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Nanostructure formation in thin polymer films
In the first part of this thesis an improved process is presented to prepare laterally structured substrates via hierarchical self organization. A miscut silicon surface annealed at 1400 K under ultra high vacuum conditions is used. The resulting facets are stable against oxidation and form a …
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External control of semiconductor nanostructure lasers
Novel semiconductor nanostructure laser diodes such as quantum-dot and quantum-dash are key optoelectronic candidates for many applications such as data transmitters in ultra fast optical communications. This is mainly due to their unique carrier dynamics compared to conventional quantum-well …
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Electrical characterization of thin film nanostructure templates
… into porous alumina templates to create Ni nanostructures.
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Nanostructure formation on Germanium by ion irradiation
… can represent a possible way to produce wide nanostructured areas on semiconductor surfaces by a well-established semiconductor technology process such as ion implantation. However, the formation mechanism of this regular network of Ge columnar nanovoids is still under debate. Therefore, the …
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Kinetics of Buffer-Layer-Assisted Nanostructure Growth
The bottom-up approach to nanostructure assembly has received much attention as a promising way for technology to build ever-smaller devices. In physical vapor deposition, however, thermodynamics poses stringent rules as to what material can self-assemble into three-dimensional structures on the …
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Controlling light-matter interaction with resonant semiconductor nanostructure
… first studies the optical modes of dielectric nanostructures, including toroidal dipole (TD) excitation under illuminations of structured light. The quantitative comparison between the structured light and plane wave illuminations shows a lot of promise for exciting dominant toroidal response …
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Multidomain Peptides: Sequence-Nanostructure Relationships and Biological Applications
… modifications have a large impact on peptide nanostructure and hydrogel rheology. The first modification examined is the substitution of amino acids within the hydrophilic positions of the B block. The second set of modifications investigated was the incorporation of aromatic amino acids in …
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Nanostructure materials based supercapattery for next generation pacemaker
… develop a supercapattery device based on novel nanostructured materials to store the energy from heartbeats through a piezoelectric device. Nickel foam with a porosity of 95% was used as substrate due to its high surface area to volume ratio and highly conductive 3D network architecture. By …
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Setting and nanostructure of slag-fly ash binders
… However, little is known about the setting and nanostructure of these binders as a function of key variables like curing time, curing temperature, and slag/fly ash ratio. This knowledge is vital to create standards and building codes when these binders are used large-scale. The aim of this work …
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Crystal Cartography: Mapping Nanostructure with Scanning Electron Diffraction
Nanostructure describes the network of defective and distorted atomic structure existing on the nanoscale within materials. This nanostructure bridges the gap between idealised crys- talline structure and real materials, playing a deterministic role in tailoring physico-chemical properties, as well …
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Design of stable nanostructure configurations in ternary alloys
… segregate at grain boundaries to stabilize the nanostructure. A selection criterion has been established for designing stable binary nanocrystalline materials. This thesis explores the extension of this concept to the design of multicomponent nanostructured systems. In contrast to the simplicity …
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Electrochemical fabrication of semiconductor nanostructure arrays for photonic applications
… of the properties of semiconductor nanostructures have been an active area of research due to the enhanced performance that is observed when electrons and holes are spatially confined in one, two or three dimensions. However, the development of viable photonic devices using this …
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Characterization of the Dynamics of Optically-Injected Nanostructure Lasers
… nonlinear carrier relaxation rates observed in nanostructure lasers under large operational photon densities is also investigated under strong optical-injection conditions. A novel small-signal microwave modulation response function is derived and shown to improve upon current models at modeling …
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Engineering Collagen Nanostructure to Enable Stiff & Tough Cartilage Biomaterials
… and telopeptides on the mechanics and nanostructure of collagen were investigated (Chapter 2). In the first of two applications of collagen as a biomaterial for cartilage tissue engineering in this work, collagen was then investigated as part of a biohybrid composite system where the …
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Three-dimensional nanostructure determination based on scanning electron nanodiffraction
… is developed here for the determination of 3D nanostructures. The technique employs high resolution and low-dose scanning electron nanodiffraction (SEND) to acquire diffraction patterns in the 3D reciprocal space, with the help of a special sample holder for large angle rotation. Grains are …
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Nanostructure stabilization and mechanical behavior of binary nanocrystalline alloys
… thesis, we propose a thermodynamic model for nanostructure stabilization that derives from the energetic state variables characteristic of binary alloys. These modeling results motivate the study of Ni-W alloys in particular, which may be synthesized via aqueous electrodeposition, accessing …
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Raman studies of the nanostructure of sol-gel materials
Four sol-gel systems (alumina, aluminum hydroxide, zirconia, and magnesia) were investigated, primarily by laser spectroscopy, on several series of materials prepared by systematically varying the synthesis procedures. Key material phases analyzed were: (1) nanocrystalline boehmite [AlO(OH)]; (2) …
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Robust Parameter Design for Automatically Controlled Systems and Nanostructure Synthesis
… with automatic control and for synthesis of nanostructures. In many automatically controlled dynamic processes, the optimal feedback control law depends on the parameter design solution and vice versa and therefore an integrated approach is necessary. A parameter design methodology in the …
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Continuum Elasticity Modeling Of Nanostructure Evolution In Strained Film Epitaxy
<p>The formation of surface nanostructures such as islands or quantum dots during strained film epitaxy has attracted great interest in recent years. The underlying mechanisms have been attributed to the occurrence of morphological instabilities of the strained films, for which the coupling between …
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