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 50 for “"micropores"”.
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Porosity in Oolitic Limestones
… which make up the ooid cortex. These equant micropores are locally constricted to plates or tubes only 0.1 (mu)m in their short dimension (s), which are "throats" between the larger equant micropores. If the interparticle space is tightly cemented, any fluids passing through the rock must …
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Macro- and micro-structural features direct bone regeneration in patterned biphasic calcium phosphate scaffolds
… (BCP) scaffolds with both macropores and micropores (MP) show enhanced bone healing compared to those with macropores and no micropores (NMP), but the role of micropores is unclear. In this work, we assess the influence of scaffold macro- (> 300 μm) and microporosity (< 50 μm) on bone …
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Platinum Nanoparticles to Study Metal Location in Shape-Selective Hydrocracking
… twofold: firstly, hydrocracking inside the MFI micropores is selective to C-type β-scission which results in linear cracking products, and secondly, H2O competes at the acid sites which allows for the desorption of the linear primary cracking products. From previous literature it is evident that …
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Evaluating Competitive Sorption Mechanisms of Volatile Organic Chemical Mixtures in Soils and Sediments Using Polymers and Zeolites
… hypothesized that the size and polarity of these micropores control competitive sorption and mass transfer rates of sorbate mixtures. To test this hypothesis, aqueous isotherms and desorption kinetic profiles for trichloroethylene (TCE) and tetrachloroethylene (PCE), either alone or in a mixture, …
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Development of Model Hydroxyapatite Bone Scaffolds With Multiscale Porosity for Potential Load Bearing Applications
… alone did not influence bone healing in vivo, micropores were shown to provide tailorability of scaffold mechanical properties, provide a location for the storage and controlled release of a growth factor, and provide a location for bone integration inside the scaffold rods.
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Fabrication and Evaluation of Specialty Nonwoven Materials
… of the cotton nonwoven showed the presence of micropores and macropores. High BET surface area and average pore diameters close to micropores were obtained. The comparison between the N2 and CO2 adsorption showed that BET surface area for N2 adsorption is much smaller than that for CO2 …
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Microstructure-induced capillary force effects on penetration and release in hydroxyapatite bone scaffolds
… and mineralized bone have been observed inside micropores. However, until now, a mechanism to explain the increased bone formation and the presence of cells has not been proven. In this dissertation I present the first mechanism that explains enhanced bone formation and integration in …
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Aromatic hydroxylations over titanium-substituted crystalline silicates
… The role of shape selectivity inside the micropores of the solids and the reaction at their external surface was also examined.
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Study of vapor/gas permeation using thin immobilized liquid membrane
… were immobilized in part of the micropores of a hydrophilic, hydrophobic or ceramic hollow fiber substrate. To prepare such thin ILMs, three approaches were used: evaporation of the a volatile solvent; acrylic acid-grafted hollow fibers providing a thin hydrophilic layer; …
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The design of a microfabricated air electrode for liquid electrolyte fuel cells
… holes that are formed from the die and micropores present in the carbon matrix. The holes are used for gas transport while the micropores are saturated with a liquid electrolyte for ion transport. The catalyst is loaded into the microfabricated structure by electrodepositing thin …
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Étude des phénomènes de pénétration des espèces chimiques dans les revêtements cathodiques des cuves d'électrolyse de l'aluminium
… sodium se retrouve sous forme adsorbée dans les micropores des matériaux alors que l'autre fraction est insérée dans la structure cristalline du carbone. Dans les phases graphitiques (matériaux graphitisés et graphitiques), seuls les micropores sont occupés par le sodium Ce résultat explique la …
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Design, construction and commissioning of an apparatus to perform frequency response diffusivity measurements and high time-resolution ftir spectroscopy
… of zeolites are usually situated within the micropores of the crystals. Since the size of zeolite micropores is of a similar order of magnitude to that of many molecules, the intracrystalline diffusion of reactants and products is often the step that determines both the reaction rate and …
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Thermal Management Using Liquid-vapor Phase Change in Nanochannels
… cross-connected buried SiO2 nanochannels, with micropores of diameter ∼2 μm at each intersection, is accomplished. The micropores allow water from a droplet placed on the surface to wick into the channels as well as allow thin-film evaporation from a meniscus. Experimental data in …
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Managing tritium inventory and release with carbon materials in a fluoride salt-cooled high-temperature reactor
… containing larger volumetric fractions of micropores (width < 2 nm) generally exhibited a higher hydrogen capacity. Further, the presence of micropores was associated with a relatively weak and reversible form of hydrogen chemisorption. At 500 Pa, microporous carbon materials captured 50 …
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Block Copolymer Derived Porous Carbon Fiber for Energy and Environmental Science
… large surface areas, and the PAN-derived micropores (< 2 nm). The mesopores and micropores both contribute to the development of the unique hierarchical porous carbon structure which brings unprecedented architectural control. The pore control greatly contributes to the carbon field as the …
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Novel Synthesis of Bulk Nanocarbon (BNC)
… with carbonizing temperature and hold time. Micropores were mostly closed for samples carbonized above 1300oC, whereas they formed interconnected network at lower carbonization temperatures. BNC has a young's modulus of 120 GPa, about ten times that of extruded graphite.
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Investigations of the assembly and function of the Toxoplasma micropore
… with electro-dense material around it, called micropores. Therefore, it was suggested that *Toxoplasma* would have clathrin-dependent endocytosis through this pore. Later studies proved that *Toxoplasma* ingests material from its environment in intra and extracellular stages. Nevertheless, …
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A Software Framework For the Detection and Classification of Biological Targets in Bio-Nano Sensing
… Micro and nanosystems, such as solid-state micropores and nanopores can measure and translate these properties of biological targets into electrical spikes to decode useful insights. Nonetheless, such approaches result in sizable data streams that are often plagued with inherit noise and …
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The effect of pore size and porosity on capillary pressure in microporous hydroxyapatite samples
… in part due to capillary forces induced by the micropores. The micropore-induced capillary forces can self load cells into the scaffolds. In this study, the effect of micropore size and porosity on capillary forces was investigated. Rectangular shaped HA samples that were either 50% or 60% …
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