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 42 for “"Core-shell structure"”.
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Synthesis and structural characterization of ZnTe/ZnSe core/shell tunable quantum dots
… present a novel approach to synthesize ZnTe/ZnSe core/shell tunable quantum dots. Characterizations such as transmission electron microscopy, wavelength dispersive X-ray spectroscopy, powder x-ray diffraction are employed to give evidence for the core/shell structure. Absorption, and …
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Synthesis and Characterization of Silica Coated CdSe/CdS Core/Shell Quantum Dots
… layer was grown on CdSe QDs, forming a CdSe/CdS core/shell structure, to improve the photoluminescence. In order to use these QDs in-vivo, a more chemically robust coating, silica, was grown on the core/shell structure QD. The optical properties of the QDs were characterized by absorption and …
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Synthesis and Investigation of Nanomaterials by Homogeneous Nonaqueous Solution Phase Reactions
… of nanomaterials in different environments and structure, including spherical nanoparticles, nanowires and core-shell structure composites We first synthesized metallic nanomaterials in this system, such as ~10 nm Fe nanoparticles, ~6 nm Au nanoparticles, and ~100 nm Bi nanoparticles, this …
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Nonaqueous Synthesis of Metal Oxide Nanoparticles and Their Surface Coating
… solution processes and the formation of core-shell structure metal oxide composites using some of these nanoparticles as the core with silica, titania or polymer as shell via a modified microemulsion approach. In the first part, the experimental procedures and characterization results of …
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Development of manganese oxide based nanostructures by wet chemical methods for enhanced energy storage and photocatalytic applications
… comprised of development of manganese oxide nanostructures via wet chemical approaches such as electrochemical deposition and solvothermal techniques. The impacts of deposition parameters of manganese oxides were studied in details to tune the morphology, crystallinity and electrochemical energy …
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The Synthesis of Core-Shell Iron@Gold Nanoparticles and Their Characterization
… in a polar aprotic solvent with about 11 nm core of Fe and about 2.5 nm shell of Au. In this work, a combination of TEM (transmission electron microscopy), XRD (X-ray Powder Diffractometry), EDS (Energy disperse X-ray spectroscopy), SQUID (Superconducting Quantum Interference Device), TGA …
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Design of Functional Polymeric Micelles as a Carrier for Anticancer Drug Delivery
… drug delivery carriers due to their particular core/shell structure, ease of functionalization, sustained circulation in the blood and its ability to passively accumulate in leaky tumor tissues. Two important factors that should be considered in the design of polymeric micelles are kinetic …
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Design and synthesis of microcapsules using microfluidics for autonomic self-healing in cementitious materials
… cracks, can extend the service life of concrete structures and decrease the costs associate with repair and maintenance actions. However, the size, shell thickness, shell material and mechanical properties of the capsules still need to be optimised to ensure self-healing performance. Thus, the …
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A study of InAs based quantum structures for use in optoelectronic devices
… (e.g., InAsSb NWs, InAs/AlSb NWs and InAs/GaSb core-shell NWs) have been investigated. The NW samples were grown by molecular beam epitaxy (MBE); self-catalysed droplet epitaxy was used as the growth mechanism for them. To improve the optical properties of InAs NWs, we further optimised the MBE …
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Smart material composites for magnetic field and force sensors
… magnetoelectric composites, a metal – ceramic core-shell composite structure was investigated. Metal-ceramic composite particles were synthesized at room temperature and their magnetic properties were investigated. The particles constitute a core-shell structure where the core is nickel-metal, …
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Uniform double wall microspheres/microcapsules for protein delivery
… routes of administration. Also, the geometric structures of microparticles can influence the resulted release profile. In this project, by using the Precision Particle Fabrication method, we produced uniform double-wall microspheres (DWMS) with a protein-loaded (Bovine Serum Albumin) PLG core …
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Synthèse de nanoparticules de carbure de fer dans un réacteur à plasma inductif
… that the produced nanometric particles have a core-shell structure and that they are embedded in an amorphous carbon. A new method has also been developed to collect the produced nanopowder in a liquid in order to minimize nanoparticle dispersion into the air, and protect pyrophoric …
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Cobalt core-shell nanoparticles as precursors for cobalt-based Fischer-Tropsch synthesis catalysts
Core-shell nanoparticles may have an economic advantage over traditional nanoparticles as a catalyst, since the expensive, catalytically active material, which is subsurface, may be replaced with a cheaper counterpart. Furthermore, core-shell nanoparticles may be tailored to have a specific …
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ADVANCED MATERIALS AND PROCESSES FOR GAS SEPARATION AND STORAGE APPLICATIONS
… materials comprised of MOF and zeolite with core-shell structure for H2 purification to achieve large adsorption capacity, high selectivity, and fast kinetics under multicomponent. In addition, the kinetics of H<sub>2</sub> purification over high-surface area Activated carbon under pressure …
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Integration of CdSe/ZnS Quantum Dots into As-induced Etched Nanovoids on GaSb
… the GaSb surface, to investigate the internal structure of the voids, and to determine the average size dimensions of the voids, and the void density. Furthermore, experiments and measurements were carried out to check the ability of the quantum dots to fluoresce at the high regrowth …
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Structure and Dynamics in Ligand-Protected and Supported Metal Nanoparticles
… fundamental understandings of nanoparticle structure. Analysis of the x-ray absorption spectra provides structural information with 0.001 A precision. Quantitative high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM) measurements characterize metal clusters …
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High strength carbon nanofibers derived from electrospun polyacrylonitrile
… and carbonization temperatures on the structure and mechanical properties of CNFs. In this dissertation research, strong carbon nanofibers with diameters 150-500 nm were realized from PAN precursors following an optimization of key fabrication conditions. The uniqueness of these CNFs …
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Perovskite interfaces with protective zinc compounds – DFT computation and related experiments
… protective coating. Many studies have focused on core-shell structural strategies to enhance their stability, but the interfacial interactions between soft perovskite core-shell materials remain poorly understood. This thesis systematically studies the interfaces between perovskite nanocrystals …
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Modeling Shape Effects in Nano Magnetic Materials With Web Based Micromagnetics
… to a permalloy ring by adding a cross-tie structure with various widths. The in-plane hysteresis loop and reversal behavior have no notable difference in direction parallel to the cross-tie, but greatly changed in perpendicular and diagonal directions. The switching field distribution is …
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