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 “"Confinement effect"”.
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Molecular Dynamics Study of Nano-confinement Effect on Hydrocarbons Fluid Phase Behavior and Composition in Organic Shale
… behavior. In this study, a MD simulation of nanoconfinement effect on hydrocarbon fluid phase and compositional behavior in organic shale rocks is presented. Chapter 1 reviews and discusses previous works on MD simulations of geological resources. With the knowledge acquired, a fully atomistic …
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Interfacial Mechanical Strength Characterization in Multilayered Materials via Nanoscale Impact and Nano Mechanical Raman Spectroscopy Experiments
… as well the coupling of other factors such as confinement during the loading. Thus, separating main phase constitutive behavior from interface constitutive behavior in mechanical property measurement experiments is an arduous task. In this work, an epoxy interface between glass plates is …
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Development of Nanoprobes for the Biological Imaging Using Positive Charged Quantum Dots and Upconversion Nanoparticles
… physicochemical properties due to the quantum confinement effect. Semiconductor quantum dots (QDs) or upconversion nanoparticles (UCNPs) exhibit interesting properties such as high photoluminescence, photostability, dual magnetic/optical modality. In this study, biocompatible and stable NPs …
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INVESTIGATION OF ELECTRIC AND THERMOELECTRIC PROPERTIES OF GRAPHENE NANORIBBON
… measurements on supported Graphene Field Effect Transistors (GFETs) show an estimated energy gap of 13mev for 60nm wide GNR. In addition, we also investigated the thermoelectric properties of GNR. GNR on Si/SiO2 substrate. Seebeck coefficient S of GNR with width of ~70nm and length of 1µm …
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Multiscale modeling of fracture and deformation in interface controlled materials
… dependent mechanical properties and by size effects due to geometrical confinement. Dislocation activities, interface mediated plasticity, and macroscopic yielding are quite different from those in unconstrained metals. The role of interfaces for the material properties and for the governing …
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Structural, electronic and optical properties of cadmium sulfide nanoparticles
… excitations are strong excitonic. The quantum-confinement effect in the lowest excitation is visible as the excitation energy decreases towards the bulk band gap with increasing particle size. Dangling bonds at unsaturated surface atoms introduce trapped surface states which lie below the …
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A Study of the Nucleation and Formation of Multi-functional Nanostructures using GaN-Based Materials for Device Applications
… to investigate the relationship between quantum confinement (and/or piezoelectric polarization) and the dot size. For dot height < 4.1nm, the confinement effect is larger than the piezoelectric effect, otherwise the piezoelectric effect is more dominant. In addition, GaN nanostructures grown on …
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Fabrication of site-controlled quantum structures for optoelectronic devices
… devices, utilizing the three-dimensional quantum confinement effect to improve device performance as well as to create devices with new functionalities. However, despite its prevalence in fabrication of QDs, self-assembled QD growth via the Stranski–Krastanov growth mode does not provide much …
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The response of partially-confined right-circular cylinders to internal blast loading
… subjected to internal blast loading. "Partial-confinement" refers to an enclosure that may retain a significant, quasi-static pressure following an internal explosion, while "thin-walled" implies that the cylinder wall thickness is small relative to other geometric dimensions. The cylinder …
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Quantum confinement effects on light absorption in Germanium for solar energy conversion
… offering innovative materials with interesting effects exploitable for energy production, distribution and saving. Among other materials, Group-IV semiconductors have been deeply investigated since they allow the fabrication of abundant, non-toxic, mono-elemental nanostructures (as Si quantum …
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Quantum-confined Inorganic-organic Lead Halide Perovskite
… various applications. We then investigate the confinement effect of the nanoporous GaN on MAPbBr3 perovskite via transient photoluminescence and transient absorption characterisation. The spatial confinement leads to enhanced charge carriers interaction, revealing as a blue shift in …
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Studies on semiconductor nanoparticles and polymer nanocomposites
… property which is attributed to a strong quantum confinement effect. The ability to tune the physical properties of nanocrystallites makes them an important category of materials with potential use in a wide range of technological applications. This project deals with the synthesis, …
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Electronic properties of gallium nitride nanowires
… transport in GaN nanowires. Particularly, the effect of the surrounding dielectric on the conductivity of GaN nanowires is experimentally shown for the first time. Our GaN nanowires are grown by catalytic vapor growth methods, specifically hydride vapor phase epitaxy (HVPE) and chemical vapor …
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Photochemical Tuning of Surface Plasmon Resonances in Metal Nanoparticles
… of this book describes two applications of this confinement effect. Firstly, the use of single particles as optically active probes for scanning near-field optical microscopy is demonstrated. Secondly, fluorescence enhancement in the vicinity of a single MNP is described theoretically. This …
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Corrosion Behavior of Corrosion-Resistant Steel Reinforcements in High and Ultra-High Performance Concrete in Chloride Attack Environments
… of reinforcement, the weakening of the confinement effect on core concrete, and the deterioration of cover concrete. The analytical model showed reasonably accurate predictions when the analytical modeling results were compared with the experimental data in this study. Furthermore, a …
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Advanced Composites for Design and Rehabilitation of Hydraulic Structures
… also indicates that underwater FRP system is effective in dry surface wrapping (ambient field conditions) as well. Threefold increase in load capacity (1921 psi vs. 6865 psi) and 3.22 times increment in energy absorption was observed with 5 layers of wrapping. Concrete cylinders with steel …
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Nanoscale Confinement Effects on Poly(ε-Caprolactone) Crystallization at the Air/Water Interface & Surfactant Interactions with Phospholipid Bilayers
Two-dimensional (2D) nanoscale confinement effects on poly(ε-caprolactone) (PCL) crystallization were probed through crystallization studies of PCL-b-poly(tert-butyl acrylate) (PCL-b-PtBA) copolymers, PCL with bulky tri-tert-butyl ester endgroups (PCL triesters), PCL with triacid end groups (PCL …
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The Bio-Nano Interface: Investigating the Roles of Nanoparticle Morphology, Microstructure, Optoelectronic Properties, and Surface Chemistry for Biological Applications
… in recent decades. Due to the quantum confinement effect, these materials have highly tunable optical and electronic properties that depend on the nanocrystal size, shape, and composition. Because of these properties, QDs are potentially useful for applications such as LEDs, lasers, …
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Group IV element-based luminescent nanoparticles: synthesis, environmental impact evaluation and bio-imaging applications
… and electrical properties via the quantum confinement effect, traditional QDs have stimulated a significant amount of fundamental research into nanoscale luminescence phenomena as well as the rapid growth of consumer products that are made of QDs. However, the commercialization of QD-based …
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A numerical assessment of architectural parameters for anisotropic behavior in idealised trabecular structures
… lattice is isotropic with a large constraint effect as is the Kelvin cell, and the triangular lattice is isotropic with a small constraint effect. The octet-truss was the closest analogue to the triangular lattice, having a small constraint effect and being less anisotropic than the cubic …
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