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 67 for “"Porous structures"”.
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Measurement of gas flow through porous structures using thz spectroscopy
… THz spectroscopy to measure the flow of gas in a porous material, packaging foam, is investigated. Specifically, Terahertz spectroscopy from 0.5 to 0.7 THz is used to measure the THz absorption of 1, 1 -difluoroethane. Several experiments are performed to test the ability of THz spectroscopy to …
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Experimental design for study of nucleate boiling in porous structures
… required to initiate nucleate boiling inside porous wicks is not well understood in practice. This thesis reports the design of an experimental setup for investigating the onset of vapor nucleation in sintered porous structures. Pressure sensing was evaluated as an effective means of detecting …
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Morphological and Mechanical Quantification of Porous Structures by Means of Micro-CT (Morfologische en mechanische kwantificatie van poreuze structuren met behulp van micro-CT)
Suitable characterization techniques for porous structures are required to (i) understand and to be able to simulate, via finite elements (FE), the structure-properties relationships and (ii) understand the relationship between the morphology and mechanical behaviour on one hand, and the failure …
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Hierarchical Templates and Their Application to Multimodal Porous Materials Fabrication
… catalysis carriers. Well-defined hierarchically porous materials are promising candidates for a wide range of applications relating to biosensors, separations, drug delivery, surface-enhanced Raman scattering (SERS), etc. Research on synthetic methodologies is expanding. However, fabrication of …
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ISPH Modelling of Solitary Wave Interaction with Permeable Beaches
… these protections and beaches are considered as porous media. Accurate prediction of wave motion around porous structures is necessary for the effective design of stable and durable coastal protections. Although mesh-based methods have been conventionally utilised to simulate porous flows, they …
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Nickel-based designed materials manufactured via laser-based powder bed fusion of metals for high-temperature applications
… or cutting-edge cooling techniques. Using open-porous structures made from superalloys for transpiration cooling is one of these approaches. The additive manufacturing technology, laser-based powder bed fusion of metals (PBF-LB/M) can create parts from high temperature alloys. According to …
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Aligned Continuous Cylindrical Pores Derived from Electrospun Polymer Fibers in Titanium Diboride
… create continuous long range ordered multi-scale porous structures in titanium diboride (TiB2) is investigated in this work. The introduction of electrospun PS fibers as a sacrificial filler into a colloidal suspension of TiB2 allows for easy control over the pore size, porosity, and long range …
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Hydrogel cell encapsulation for tissue engineering
… engineering approaches, cells seeded within 3D porous structures are expected to remodel into tissue-like structures. Despite significant progress, difficulties in lack of control over tissue architecture as well as vascularization continue to limit the efficacy of engineered constructs. This …
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Design and large deformation response of additively-manufactured shell-lattices
Open-cell cellular solids are porous structures with a large variety of applications, from energy absorption to medical engineering. In an attempt to identify isotropic configurations with high low and large strain mechanical properties, detailed numerical simulations are conducted on a wide range …
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CVD Grown Graphene-Based Materials: Synthesis, Characterization and Applications
… with heteroatoms and creating graphene hetero-structures are two approaches herewith suggested to sidestep the above limitations. The illustration of thus approaches begins with the chemical vapor deposition (CVD) growth of graphene in the form of either atomically thin films or 3D porous …
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Towards a lithium-ion fiber battery
… phase separation as a method to introduce porous structures inside thermally drawn fibers for the very first time. This new versatile process allows us to incorporate ionically conductive gel-polymer electrolytes in fiber cores in a very simple way, with ionic conductivities suitable for a …
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Materials and coatings derived from the polymerizable ionic liquid surfactant 1-(2-Acryloyloxyundecyl)-3-methylimidazolium bromide
… in IL-Br resulted in the formation of open-cell porous structures in several of these materials, which was confirmed by SEM.</p>
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Photoinduced wetting kinetics of water on immersed nanoporous titania surfaces with application to oil-water separation
… of previous studies have shown that meshes and porous structures can be used to separate oil/water mixtures through careful control of surface energy and preferential wettability, however these structured surfaces are prone to fouling by oil and dirt. The photocatalytic and hydrophilic nature of …
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Fabrication of tissue engineering scaffolds with spatial control over architecture and cell-matrix interactions in 3D
… in scaffold design were explored: l) dense structures for strength but with large (600 μm) channels for tissue and vasculature ingrowth. and 2) porous structures with room for cell attachment and growth. Porous structures fabricated from PLLGA and rat bone were implanted subcutaneously on …
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A computational framework for the large scale simulation of the dynamics of highly flexible filaments in a viscous flow
… to predict the macroscopic stiffness of porous structures from their geometries. We train the weights of the model with synthetic data associating the effective Young’s moduli of porous structures to the size of the pores present in the material. To mitigate the high cost of generating …
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Manipulating fluids and fields In multimaterial fibers
… Finally, by integrating surface-interfaced porous structures into electrode-integrated fibers, we demonstrate fluid flow manipulation in the radial direction for application as a fiber sweat sensor.
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Theoretical Analysis of Transpiration Cooling of a Liquid Rocket Thrust Chamber Wall
… fluid in local thermal equilibrium with the porous structures that make up the thrust chamber wall. The programs were run with similar conditions and the results show that the incompressible flow model is a useful tool for accurately determining the temperature distribution inside the thrust …
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Preparation and characterization of new porous ceramic filters for hot gas clean-up
… alternative to existing ceramic candle filters. Porous ceramic candle filter elements were successfully fabricated from calcium aluminate cement, calcined fireclay aggregate, and organic pore formers using refractory concrete casting techniques. Methods used to characterize the porous ceramic …
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