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 19 of 19 for “"Small-angle scattering"”.
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Small angle scattering characterisation of micellar systems and templated architectures
… CO2 and selected hydrocarbon environments. Using small angle neutron scattering (SANS) techniques the spacing between liquid crystal micelles was measured in-situ. The liquid crystals studied were templated from different surfactants with varying structural characteristics. Micelles of a dilute …
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Investigation of microstructure of disordered colloidal systems by small-angle scattering
Small-angle scattering (SAS) has been widely applied to study the microstructure of colloidal systems. Although colloids cover a wide range of materials, in general they can simply be viewed as basic building particles arranging themselves, according to their interaction, in a continuous medium. In …
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Machine Learning for Structural Characterization and Generation: Applications to Small-Angle Scattering and Electron Microscopy
… and nanostructural characterization methods. Small-angle scattering (SAS) and electron microscopy (EM) experiments yield rich data sets that contain structural and morphological information of nanostructures. Exploiting data-driven methods to extract these insights is a natural fit. …
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Connecting Small-Angle Diffraction With Real-Space Images by Quantitative TEM of Amorphous Thin Films
… structural probes such as neutron or x-ray scattering give limited information, restricted mainly to near-neighbor bond lengths and bond angles, but these probes become less useful when trying to examine structure on ""medium"" length scales, roughly 1 nm in size. Small-angle scattering is …
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Connecting small-angle diffraction with real-space images by quantitative TEM of amorphous thin-films
… structural probes such as neutron or x-ray scattering give limited information, restricted mainly to near-neighbor bond lengths and bond angles, but these probes become less useful when trying to examine structure on ""medium"" length scales, roughly 1 nm in size. Small-angle scattering is …
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Self-Assembly of Azobenzene Photosurfactants and the Relationship with Macroscopic Properties
… and use as templating agents. In this work, small-angle scattering is used extensively to probe the shape and dimensions of the self-assembled surfactant aggregates in solution. It will become apparent this is a key technique in the characterisation of dynamic and soft matter systems. Chapter …
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Anistropic phenomena in strongly correlated electron systems
… superconductors. A phenomenological anisotropic small-angle scattering model is investigated; Hall effect measurements can be reproduced for parameters sufficiently close to particle-hole symmetry, but the experimentally observed magnetoresistance cannot be explained. The second project studies …
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Particle microstructure and polymer dynamics in concentrated polymer solutions
… polymer solutions are studied with extensive small angle scattering and NMR experiments. Silica nanoparticles are suspended in polymer-solvent mixtures. The effects of polymer induced interactions on the particle microstructure are examined with varying (i) polymer concentration, (ii) solvent …
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Phase Behavior, Microstructure and Mechanics of Colloid -Polymer Mixtures
… solvents, over the entire region of phase space. Small-angle scattering techniques are used to determine the suspension microstructure and excellent quantitative agreement is demonstrated with PRISM in the equilibrium fluid. As expected, equilibrium theory predictions fail in the gel state …
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INTEGRATIVE MODELLING FOR THE CHARACTERISATION OF THE STRUCTURE AND DYNAMICS OF BIOMOLECULES
… The first paper describes the development of a small-angle scattering model for the in silico reconstruction of scattering intensities from atomic coordinates during molecular dynamics (MD) simulations. This model can be coupled with restraining strategies, such as metainference, to generate …
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Precursor phases in non-classical crystallization
… The combination of atomic force microscopy, small angle scattering, and ξ-potential measurements confirms the coexistence of monomers and Glu/PEI complexes and the aggregation of complexes in Glu-PEI-water systems. This suggests that there might be a direct structural transformation between …
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The mesophase structure of surfactants
… resonance, optical polarising microscopy and small angle scattering techniques. The phase diagram has been established and the phases encountered exist for the most part from 24 to 60% surfactant by weight. Above and below these concentrations exist isotropic and lamellar phases respectively. …
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Intermediate phases of surfactant - water mixtures
… headgroups increases. In the C30E09 system a small angle neutron scattering study on a 42 wt.% sample has allowed the epitaxial relationship between the lower temperature hexagonal (H1) phase and the mesh intermediate phase, with the (10) planes of the H 1 phase becoming the (001) planes of …
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Morphology-Property Relationships in Semicrystalline Aerogels of Poly(ether ether ketone)
… MW and increasing compressive modulus. Contact angle and contact angle hysteresis revealed that PEEK aerogels have a high contact angle, exceeding the conditions necessary to be classified as superhydrophobic materials. PEEK aerogel contact angle decreases with increasing density and a very low …
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The effect of macromolecular crowding on the structure of the protein complex superoxide dismutase
… which biomolecules are usually studied.^ We used small angle scattering (SAS) to measure the effects of macromolecular crowding on the size of a protein complex, superoxide dismutase (SOD). Crowding was induced using 400 MW polyethylene glycol (PEG), triethylene glycol (TEG), …
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Understanding aggregation of solvating extractants in applied separations
… were similar to those found previously using small angle neutron scattering (SANS). However, diffusion experiments suggested the presence of repulsive interactions between aggregates, while prior SANS experiments suggested attractive interactions. Diffusion NMR spectroscopy, rheology, and SANS …
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Räumlich definierte Homo- und Blockcopolymer Nanokomposite
… can be produced. The np-interface is very small in this simple setting, the efficiency is limited. Nevertheless the components used in the solar cell can be tested for their effectiveness by this simple three-dimensional layer structure. In this thesis three different approaches have been …
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Understanding the Effects of Higher-Order Assembly on the Structure of Sulfite Reductase
… homologs. Chapter 2 provides information about small-angle scattering technique including both neutron scattering and X-ray scattering. Small-angle neutron scattering (SANS) and neutron contrast variation technique are discussed in detail. SANS is used to analyze the solution structure of …