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 11 of 11 for “"Edge surface"”.
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An Improved MUSIC Model for Gibbsite
… that have proposed MUSIC models for gibbsite surfaces have purported to achieve a very good fit with potentiometric titration data. However, in order to achieve such results, several significant parameters, such as the number of surface sites, site densities, and pKa values were sometimes …
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Determination of Surface Free Energies and Aspect Ratio of Talc
… angle measurements were conducted to assess the surface chemistry of the mineral talc. The contact angles were performed on both flat and powdered samples and the results were used to determine the surface free energy components and parameters (SFEC) using the acid-base theory for solids, …
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Assessing the Reactive Surface Area of Phlogopite during Acid Dissolution: An Atomic Force Microscopy, X-ray Photoelectron Spectroscopy, and Low Energy Electron Diffraction Study
The behavior during dissolution of edge and basal surfaces of the mica phlogopite were examined using in situ atomic force microscopy (AFM), x-ray photoelectron spectroscopy (XPS) and low-energy electron diffraction (LEED) in an attempt to characterize the reactive surface area during dissolution. …
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Surface Free Energy Characterization of Powders
… angle measurements were conducted to study the surface chemistry of powdered minerals. The contact angle measurements were conducted on both flat and powdered talc samples, and the results were used to determine the surface free energy components using Van Oss-Chaudhury-Good (OCG) equation. It …
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Edge fracture of AHSS sheets under out-of-plane loading followed by in-plane loading
In recent years edge fracture has become a challenge in the manufacturing industry with the dramatical increase in the application of light-weight materials such as Advanced High Strength Steels (AHSS) and aluminum alloys. A premature edge cracking is observed in components with …
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Atomic Force Microscopy Study of Clay Mineral Dissolution
… dissolution rates normalized to their reactive surface area, which corresponds to the area of their edge surfaces (A<sub>e</sub>). The A<sub>e</sub>-normalized rates for these minerals between pH 1-2 are all ~10E<sup>-8</sup> mol/m<sup>2</sup>*s, and compare very well to other …
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All-atom and Coarse-grained Molecular Dynamics Modeling of Various Polymeric and Composite Materials
… aggregation. Experiments show that coating the surface of reduced graphene oxide (rGO) nanoparticles with PEI chains can improve their dispersion in a PEI matrix and thus lead to stronger composites. Simulations reveal that the PEI chains grafted to the edge surface a rGO particle form a …
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2D CFD Simulation of a Circulation Control Inlet Guide Vane
… jet that exhausts along the IGV's trailing edge surface. The IGV is designed for an axial inlet flow at a Mach number of 0.54 and an exit flow angle of 11 degrees. These conditions were selected to match the operating conditions of the 90% span section of the IGV of the TESCOM compressor rig …
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Design and Performance of Circulation Control Geometries
… momentum jet flow ejected over a curved trailing edge surface and in turn utilizes Coanda effect to increase the airfoil’s circulation, augmenting lift, drag, and pitching moment. The technology has been around for more than 75 years, but is now gaining more momentum for further development due to …
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Micro-photovoltaic materials and systems for solar energy harvesting and light management
… PEC system. As a result of the high surface area to volume ratio inherent to the small size of silicon solar µ-cells, we next develop device structures to improve microcell device performance by introducing a new architecture of the silicon heterojunction (SHJ) variety. SHJ PV …
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Interaction of aqueous U(VI) with goethite, montmorillonite, and UO2(s)
<p>Uranium contamination in subsurface environments is a matter of great concern throughout the world. Fate and transport of uranium in the subsurface can be controlled by U(VI) adsorption and reduction onto common iron (oxy)hydroxides and clay minerals. Aqueous U(VI) can also exchange uranium …