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 “"Porous microstructure"”.
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Modelling of brine transport mechanisms in Antarctic sea ice
… of a biphasic model based on the Theory of Porous Media (TPM) which considers a solid phase for the pore structure of the ice matrix as well as a liquid phase for the brine inclusions, respectively. This work explores the use of the TPM framework towards advancing the description and study …
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Properties and sensor performance of zinc oxide thin films
… although it had only minor effects on the microstructure. DC resistance, I-V curves and AC impedance were utilized to investigate the gas response of ZnO sensors. ZnO films prepared with high O2/Ar ratios showed better sensitivity to various gases, a feature believed to be related to their …
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Modelling Thermal Conductivity of Porous Thermal Barrier Coatings for High-Temperature Aero Engines
… super-alloy substrate. The highly heterogeneous microstructure of the TBC consists of defects such as pores, voids, and cracks of different sizes, which determine the coating’s final thermal and mechanical properties. The service lives of the coatings are dependent on these parameters. These …
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Electrical Breakdown of Thermal Spray Alumina Ceramic Applied to AlSiC Baseplates Used in Power Module Packaging
… coatings have a major problem since they have a porous microstructure which can trap undesired moisture. The moisture basically causes the coatings to have a lower dielectric breakdown voltage and a higher leakage current at normal operating voltages. This problem can be eliminated by …
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MULTI-LAYERED, VARIABLE POROSITY SOLID- STATE LITHIUM-ION ELECTROLYTES: RELATIONSHIP BETWEEN MICROSTRUCTURE AND LITHIUM-ION BATTERY PERFORMANCE
… focused on the relationship between the microstructures of electrochemically- active materials and overall battery performance. The advent of solid-state electrolytes with multi-layered, variable porosity microstructures opens new avenues to creating the next generation of rechargeable …
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Microstructure and micromechanics of the sea urchin, Colobocentrotus atratus
The purpose of this research is to study the porous microstructure and the micromechanics of the exoskeletal armor of the helmet urchin, Colobocentrotus atratus. Its unusual reduction in spines forms a smooth tiling of millimeter-sized, flattened polygonal protective aboral spines. Each aboral …
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Study of Freeze-Cast Porous Silica Nanoparticle-Based Composites
Porous silica-based nanocomposites are promising ceramics, as they exhibit high specific surface area, highly porous network, and a surface that can be easily functionalized. This dissertation describes the results of a study on the formation and properties of porous silica nanoparticle-based …
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Application of Cell-Derived Extracellular Matrix (ECM) Scaffold on Tissue Engineering Cartilage
… as nude mouse and rabbit model. Chapter I: A porous cell-derived ECM scaffold was prepared with a freeze-drying protocol using porcine chondrocytes. The ECM scaffold had highly uniform porous microstructure by scanning electron microscope (SEM). It showed an average pore diameter of 504±108um, …
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Development of physical models for the mesoscopic simulation of gas-surface interactions
… carbon surfaces: flat (vitreous) and complex porous microstructure (FiberForm®) at high temperatures ranging from 500 K to 2000 K. These models may be employed directly in conventional computational fluid dynamics (CFD), kinetic simulation, and material response tools for the study of …
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Characterization of carbon ablators for hypersonic thermal protection systems
… influence of diffusion-reaction competition in porous carbon-fiber ablators. Micron-resolution in situ X-ray microtomography (µ-CT) was conducted on oxidizing FiberForm samples at elevated temperatures across a range of pressures, producing time-resolved 3D (4D) image data of carbon fiber …
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Flash-Sintering of MnCo2O4 and (La, Sr)(Co, Fe)O3 Ceramics for Potential Application in SOFC
… as it may affect the material properties (microstructure, conductivity etc.). Till now, the technique has been mostly reported for weakly conducting or insulating materials. The present work deals with the conducting-edge materials to point out the versatility of flash-sintering technique. …