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 454 for “"pore size"”.
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The Role of Pore Size Distribution in Competitive Adsorption on Activated Carbon
… the adsorbent must have a wide range of micropore sizes, including pores of similar size to the target compound.
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The effect of pore size and porosity on capillary pressure in microporous hydroxyapatite samples
… 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% porous …
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Scaffold Permeability as a Means to Determine Fiber Diameter and Pore Size of Electrospun Fibrinogen
… of their topographical features (fiber and pore size) more accurate. Three different concentrations of fibrinogen were used (100, 120, and 150mg/ml) to create scaffolds with three different fiber diameters and pore sizes. The fiber diameters and pore sizes of the electrospun scaffolds were …
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Pore size distribution and methane equilibrium conditions at Walker Ridge Block 313, northern Gulf of Mexico
In-situ pressure, temperature, salinity and pore size may allow coexistence of three methane phases: liquid (L), gas (G), hydrate (H) in marine gas hydrate systems. A discrete zone of three-phase equilibrium may occur near the base of the gas hydrate stability zone (GHSZ) in sediments with salinity …
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Roles of Background Compound Molecular Size and Adsorbent Pore Size Distribution in Competitive Adsorption on Activated Carbon
… which consisted of extensive secondary micropore and mesopore volumes, labeled as Pellet II, were evaluated for atrazine adsorption in the presence of CR in order to assess the role of PSD on competitive adsorption. The capacity for CR adsorption correlated well with pore volume between 13 …
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Effect of pore size on bone ingrowth into porous titanium implants fabricated by additive manufacturing: An in vivo experiment
Subscription articles: Theses and dissertations which contain embedded PJAs as part of the formal submission can be posted publicly by the awarding institution with DOI links back to the formal publications on ScienceDirect.doi:10.1016/j.msec.2015.10.069
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Synthesis and Study of Biomimetic Ion Channels: (1) Toward the Development of a Cyclic Peptide-Based Redox-Gated Channel, and (2) Investigations Into the Effect of Pore Size on the Ion Selectivity of an Aminocyclodextrin Channel
To probe the correlation between pore size and ion selectivity, a channel with an alpha-cyclodextrin macrocycle was synthesized and its transport properties were compared with those of an analogous channel with a larger beta-cyclodextrin pore. The anion transport profile of the alpha-cyclodextrin …
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Manufacturing of agarose-based chromatographic adsorbents with controlled pore and particle size
… achieving high resolution separation of large-sized biomolecules, such as plasmid DNA, typically around 150-250 nm in diameter. Currently, fractionation of such entities is performed using stationary phases designed for protein purification, typically employing pore sizes of about 40 nm. This …
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Multi-scale Real Gas Transport in Shale Matrix
… are, respectively, built at scales of single pores, a dual-porosity shale rock and a shale gas reservoir. These models are well validated with experimental, simulation and field data. Results indicate that increasing a taper ratio and an aspect ratio weakens a real gas effect and lowers bulk …
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Physical analysis of collagen-GAG composite scaffolds for nucleus pulposus tissue regeneration
… scaffolds were analyzed to determine pore size and cross-link density. It was determined that every material type contained large enough pore size (275 gm) to seed nucleus pulposus cells and mesenchymal stem cells. The addition of CS to the scaffold increased pore size. It was also …
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Efficient Regeneration Of Chemical Solvents For Carbon Dioxide Capture By Polymeric Membrane Contactors
… Polypropylene membranes with different pore size were studied and compared. There was no significantly change of CO2 flux for membrane pore size from 0.1micron to 2.5 micron. The membrane with pore size of 0.6 micron was found to have best selectivity. The energy utilization efficiency …
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Infiltration Models for Engineered Media in Living Roofs and Bioretention
… focuses on (1) the hydraulic properties and pore size distributions of engineered media with varying aggregates, compost ratios, and amendments, and (2) the application of the classic Richards equation with commonly-used hydraulic functions for modeling one-dimensional infiltration process in …
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Characterisation of feed and membrane properties for industrial ultrafiltration management
… fluoride (PVDF) membranes with modified membrane pore size and surface roughness were compared. An optimal pore size was found to provide both low filtration resistance and low fouling by pore blocking, while low surface roughness could enhance physical fouling reversibility. When the three …
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CO2 Minimum Miscibility Pressure and Recovery Mechanisms in Heterogeneous Low Permeability Reservoirs
… high capillary pressure owing to the nanoscale pore throats of shale rocks and it may also influence minimum miscibility pressure (MMP), which is an important parameter controlling gas floods for CO2 injection EOR. To investigate this influence, flash calculation is modified with considering …
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A comparative study of metrology techniques for porous organic thin films
… tools are needed to monitor and characterize the pore size, distribution, and percent porosity in these films in an industrial setting. Techniques used to characterize and monitor porosity in thin films are oftentimes destructive, such as Transmission Electroil Microscopy and Scanning Electron …
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The characterization of novel cements
… Portland cement had a well defined narrow pore size distribution, even after heat treatment, while the High Alumina cement samples displayed a very low total pore volume in their original state, but subsequent heat treatment led to the developement of porosity over a wide range of pore …
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Pharmaceutical tablet compaction : product and process design
… forces are used. A highly interconnected pore-structure limited tablet hardness and led to bursting behavior during dissolution. No effect of compaction force or speed was observed in dissolution profiles. Lactose granules fracture at strains less than 5%, forming monolithic structures …
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Development of a short test for the identification of aggregates causing poor concrete performance when frozen
… curve, total porosity, porosity in certain pore size range, slope of pore size distribution curve in certain pore size range, and pore modulus. A significant relationship exists between the durability factors and the slope of curves of time vs. length change, the durability factors and the …
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