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 13 of 13 for “"Freeze Casting"”.
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Freeze-Casting For Facile Synthesis Of Novel Porous Materials
Freeze-casting is a method of synthesizing porous materials from mixtures comprised of a dispersed phase (colloidal and/or solutal) and a liquid dispersant, typically water. Cooling the mixture to temperatures below the freezing point of water causes nucleation and growth of ice crystals along the …
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Freeze Casting of Aqueous PAA-Stabilized Carbon Nanotube-Al2O3 Suspensions
Freeze casting is a colloidal processing technique that shows great promise for development of nanostructured materials. A ceramic nanopowder is dispersed with a polymer in water, under carefully controlled pH. The suspension is cast into a suitable mold and frozen, then de-molded and exposed to a …
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Freeze casting of bioactive glass and ceramic scaffolds for bone tissue engineering
"The main objectives of this dissertation were to explore the production of bioactive ceramic and glass scaffolds with oriented pore architectures by unidirectional freezing of suspensions, and to characterize the mechanical and biological performance of the scaffolds. Freezing of aqueous …
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Fabrication of porous ceramics and composites by a novel freeze casting process
… the fabrication techniques for porous ceramic, freeze casting has recently attracted much attention as being a versatile, low cost and environmental friendly process. In this study, alumina and Al\(_2\)O\(_3\)-ZrO\(_2\) were utilized as model materials to investigate the preparation technique of …
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Additive manufacturing of non plastic porcelain material by direct writing and freeze casting.
… of high solid loading ceramic pastes and then freeze-casting to solidify the deposited material. This novel fabrication method, for which a patent has been granted, has been christened “Direct Writing Freeze-Casting” (DWFC). Although the DWFC process is the subject of investigation by other …
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Formation of Meso-Structured Multi-Scale Porous Titanium Dioxide by Combined Soft-Templating, Freeze-Casting and Hard-Templating Using Cellulose Nanocrystals
… of an aligned macroporous structure, freeze-casting for the preservation of particle dispersion found in suspension, and hard-templating by the use of cellulose nanocrystals (CNCs) as sacrificial material. A systematic study was conducted wherein three synthesis parameters (water …
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Study of Freeze-Cast Porous Silica Nanoparticle-Based Composites
… composites, using techniques of freeze casting and sintering. Kaolinite platelets and silica nanorods were added into the nanoparticle system, and their effects on modifying the porous microstructures and physical properties were investigated. During freeze casting, homogeneous …
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Structural properties and phase behavior in colloidal suspensions
… the structure of colloidal particles undergoing freeze casting. In this research I have used a wide variety of computational techniques in order to understand these systems. Specifically, in Chapter 2 I study nanoparticle haloing in a system of silica microspheres and highly charged polystyrene …
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Porous material and process development for electrospray propulsion applications
… As part of this research, the sol-gel and freeze casting methods for producing porous materials were characterized to better identify feasibility for electrospray propulsion. Characterization includes the feasibility of molding porous tips directly onto substrates. As a result of this …
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Scalable Processing Routes for Solid-State Energy Conversion and Storage Devices
… of solid loading of a slurry prepared for tape casting SEs enables highly uniform, dense coatings suitable for ASSBs, resulting in ionic conductivity similar to that of the pristine powder but with 11 times less area-specific resistance due to a reduction in thickness of the SE. It is revealed …
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Optimising Mass Transfer in Synthetic Porous Materials
… Murray materials, including 3D printing and freeze-casting. For printed aerogels, I reveal the fundamental principles that govern the surface morphology. This study enables the fine control of the printed architectures’ surface porosity by regulating the crosslinking agents and shear stress. …
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Printable and Machine Intelligent 0D/2D Materials Gas Sensor Arrays
… diameter, shear stress during printing, and freeze-drying conditions. I construct multiplexed filament-structured aerogel GSAs with various controllable morphologies and chemical dopants. My sensors achieve a record-high and stable response of 15.23% for 1 part per million (ppm) formaldehyde …
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Architectural control of ice-templated collagen scaffolds for cardiac regeneration
… The work in this thesis has established a novel freeze casting technique to afford specific three dimensional control of collagen scaffold alignment. The resulting scaffolds with directionally aligned pore architectures were found to enhance cellular and mechanical dynamics to better replicate …