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 20 for “"Neutron Reflectometry"”.
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Helium behavior at fcc-bcc semicoherent interfaces: trapping, clustering, nucleation, and growth of cavities
… this thesis, multi-scale modeling techniques and neutron reflectometry measurements are used to study the He trapping, clustering and growth of clusters at fcc-bcc interfaces. Choosing Cu-Nb as a model fcc-bcc interface, a predictive Cu-Nb-He interatomic potential is constructed using density …
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Interfacial Magnetism and Exchange Bias in Metal Oxide Thin Films
… and coercivity after the implantation. Polarized neutron reflectometry study reveals a significant change in magnetic spin reversal mechanism due to chemical modification. In the La0.7Ca0.3MnO3/CaMnO3 system exchange bias is assisted by the magnetic frustration at the layer interface. Results …
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Biochemical characterisation of the translocation of material through the protective antigen (PA) Pore
… modulation, toxicity, fluorescent microscopy and neutron reflectometry. The ability of LFn-GAL4, antisense oligonucleotide (ASO) complex to translocate and mediate gene modulation was assayed in vitro. The components of this complex were found to be non-toxic individually and together (PA8 3, …
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Deuterium Phase Behavior in Thin Film Pd
… was measured at room temperature with in situ neutron reflectometry. Room temperature solubility isothermal curves, out-of-plane film expansion, and deuterium depth profiles were determined from fits to the neutron reflectivity data. The measurements demonstrate that the deuterium solubility …
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Investigating Complex Organic Species on Mineral Surfaces
… was investigated via depletion isotherms, neutron reflectometry, sum-frequency generation and X-ray reflectometry. Stearic acid is shown to adsorb from toluene and can be removed and reapplied. However, in the presence of excess water, stearic acid can be removed from the surface to form …
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Physical-chemical characterization of nanoparticles in relevant biological environments and their interactions with the cell surface
… bilayers (SLB) were investigated by QCM-D and neutron reflectometry allowing resolving at the sub-nanometer scale any structural reorganization of the SLB upon NP application. Carboxylated NPs generally caused lipid hydration with different mechanisms, while HC NPs compared to in situ NPs and …
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Adsorption of Dendritic Fluorocarbon End-Capped Poly(Ethylene Oxide) at an Air-Water Interface – A Synthetic, Analytical and Computational Study
… dependence information can be found using neutron reflectometry. A key component of this project is to utilize molecular dynamics (MD) to simulate the behaviour of these polymers at liquid surfaces. For relatively short polymer chains, it is possible to quantitatively model the distribution …
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Grazing angle neutron diffraction
… and practical implementation of grazing-angle neutron diffraction as a new method of non-destructive surface and interface analysis. Diffraction in the grazing-angle geometry with x rays and neutrons possesses two unique advantages over specifically surface-sensitive methods for structure …
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Polyoxometalates and Block Copolymers: Templated Self-Assembly for Nanomaterials Applications
… these materials are investigated with polarized neutron reflectometry, nuclear magnetic resonance, and SQUID magnetization measurements. This work shows that the bottom-up pathway is a viable method for future magnonic crystal design.
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Novel Techniques and Electrolytes for Energy Storage Devices
… of the double layer is poorly understood. Here, neutron reflectometry (NR) and attenuated total reflection infrared (ATR-IR) spectroscopy were developed to study the supercapacitor double layer in situ. A custom cell was designed to study the supercapacitor electrode-electrolyte interface using …
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Coherent control of polarized neutron interferometry
… two sets of experiments using a single crystal neutron interferometer. First, we explore applications of quantum information processing (QIP) to magnetic materials characterization using polarized neutron interferometry (NI). We describe a split path spin-based interferometer geometry that uses …
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A Study of The Effect of Membrane Targeting Antimicrobial Compounds on Ionic Transport Across Lipid Bilayer Membranes
… measures, differential scanning calorimetry, neutron reflectometry, dynamic light scattering and electrical impedance spectroscopy and Arrhenius measures of their interactions with tethered bilayer lipid membranes (tBLMs). Through analysing the results obtained from these biophysical …
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Machine Learning-Augmented Spectroscopies for Intelligent Materials Design
Neutron and photon scattering and spectroscopy represent two fundamental categories of characterization techniques used to interrogate materials’ structural and dynamical properties at atomic to mesoscopic length scales. As advances at scientific user facilities enable the collection of ever larger …
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Ethoxylated amine surfactants as model additives for engine friction reduction
… through pendant drop tensiometry and small angle neutron scattering (SANS). The surfactant was found to form spherical aggregates with a radius of ∼ 11 Å at 25 °C, and its behaviour was influenced by solvent changes and dopant addition. As explored by SANS in Chapter 4, addition of 2.5−20 : 1 …
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Structural Characterization of the Interfacial Structure of the Working Electrode in Dye-sensitized Solar Cells Using X-ray and Neutron Techniques
… the working electrode in DSSCs using X-ray and neutron techniques. Chapters 1 and 2 provide an introduction to X-ray reflectometry (XRR) and neutron reflectometry (NR) techniques, i.e., the principal analytic tools used for research carried out in the context of this thesis. Chapters 3, 4, and 5 …
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Adsorption of organic friction modifiers at static and sheared interfaces
… environment, referred to as the tribometer, for neutron reflectometry (NR) and X-ray reflectometry (XRR). The tribometer can apply shear to an interface at rates of up to 3.8 x 103 s-1 and the thicknesses of thin films adsorbed at the interface can be determined via NR or XRR. The details of the …
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STRUCTURAL INVESTIGATION OF EXTRACELLULAR VESICLES AND THEIR INTERACTION WITH BIOMIMETIC INTERFACES
… calorimetry (DSC) because of its higher Tm, and neutron reflectometry (NR) by benefiting from its commercially available deuterated forms. Hence, after building-up the lipid raft model, DSC, NR and AFM, were used in a complementary fashion to fully characterize that model membrane …
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Thin liquid films with nanoparticles and rod-like ions as models for nanofluidics
… advanced reflectivity and scattering methods. Neutron Reflectometry studies were performed to investigate the location of nanoparticles in the TLF perpendicular to the IF. For the first time, we study TLFs using grazing incidence small angle X – ray scattering (GISAXS), which is a technique …
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Multiscale development of electrochemical separations: from molecular design of redox-moieties to interfacial characterization and process simulation
Pressing separations challenges, such as the recovery of critical materials from low-grade sources, the environmental remediation of trace pollutants from water, and the improvement of downstream separations in chemical manufacturing, highlight the need for novel approaches with lower energy …