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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 108 for “"Pore size distribution"”.
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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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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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Boiling heat transfer characteristics of steam generator U-tube fouling
… that the effect of deposit parameters, including pore size distribution, porosity, permeability and thickness, as well as the effect of mass flux, heat flux and steam quality were investigated. The model predictions were consistent with the experimental results, differing by an average of ±17.5%. …
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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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Phase separation spinning of porous polypropylene hollow fibers
… electron microscopes, and mercury intrusion pore size distribution measurements, it was concluded that the structure of the fibers consisted of fine networks of interconnecting voids or pores. The significant majority of these pores had diameters of less than one micron. Among the suggested …
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Non-equilibrium thermodynamics in porous media : battery degradation, and sorption and transport in porous materials
… to saturation can be used to measure the pore size distribution of the material. However, hysteresis between the wetting and drying paths complicates the interpretation of experimental results. I present a unified model of hysteresis that accounts for both single-pore and network effects, …
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Simulation of Multi-Component Gas Flow and Condensation in Marcellus Shale Reservoir
… in the PVT cell. It is highly affected by shale pore size distribution, gas adsorption, and water vapor saturation. Critical properties of gas condensate are also significantly influenced by shale pore size distribution, leading to changes in viscosity and formation volume calculations. In …
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Influence of curing on the properties of concretes and mortars in hot climates
… those found in Middle Eastern countries, on the pore size distribution, permeability, water absorption and compressive strength of cement mortars and concretes made with and without pulverized fuel ash (pfa) and ground granulated blast-furnace slag (ggbs). Three 00 environments were chosen as …
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Aspetti innovativi per la valutazione e la misura della porosità nei materiali dell'edilizia antica e moderna. La geometria frattale della porosità
… Besides the descriptive aspects of the pore size distribution, the fractal dimensions have led to the development of rational relations for the prediction of permeability coefficients to fluid and heat transfer. The research considered natural materials used in historical buildings (rock …
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Acoustic and Thermal Properties of Recycled Porous Media
… locked in the large proportion of close-cell pores. The acoustic absorption performance of a porous media is controlled by the number of open cells and pore size distribution. Therefore, this work also investigates the use of catalysts and surfactants to modify the pore structure and studies …
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Development of new membranes for desalination pre-treatment
… of the membrane. Pure water permeability and pore size distribution are the basic characteristics of any porous material. Mercury porosimetry, bubble point tests and molecular weight cut off experiments were done to study the pore structure of these new membranes and based on the results of …
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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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Preparation and characterization of mesoporous aluminosilicates from Ca-A zeolite
… have been developed in order to enlarge the pore size of the micropore-type zeolite into a mesopore type: (a) 0.2N HCl acid treatment at 80$\sp\circ$C from which the time of exposure to the acid medium has a great influence on the pore size distribution of the resulting materials. (b) A …
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Synthesis and Applications of Monolithic Metal-Organic Frameworks
… A novel capacity to control bulk density and pore-size distribution in the macroscopic monolith, via the synthetic inclusion of non-crystalline mesoporosity, was also developed. The generality of this synthetic procedure towards Zr-MOFs in general was further explored including functionalised …
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Preparation, Evaluation and Structural Modeling of Carbon-Based Adsorbents Used on Natural Gas Vehicles
… in natural gas storage is investigated. Micropore volume and bulk density of carbon adsorbents are found to be the most important factors for achieving a high volumetric methane storage capacity. Modeling of nitrogen and methane adsorption onto a porous carbon is also conducted to optimize its …
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ΜΕΛΕΤΗ ΕΠΙΦΑΝΕΙΑΚΩΝ ΙΔΙΟΤΗΤΩΝ ΚΑΙ ΚΑΤΑΛΥΤΙΚΗΣ ΔΡΑΣΤΙΚΟΤΗΤΑΣ ΠΑΡΑΣΚΕΥΑΣΜΑΤΩΝ ΥΔΡΟΞΕΙΔΙΩΝ ΤΟΥ ΑΡΓΙΛΙΟΥ
… STRUCTURE, SPECIFIC SURFACE AREA, POROSITY,PORE SIZE DISTRIBUTION AND ADSORPTION CAPACITY. THE CATALYTIC ACTIVITY ON THE ETHANOL DEHYDRATION REACTION WAS STUDIED AS WELL.
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Mesoporous Functionalized Materials for Post-Combustion Carbon Dioxide Capture.
… hybrid organic-inorganic materials were synthesized by polycondensation of bis[3-(trimethoxysilyl)propyl]amine in presence of cationic and anionic surfactants. Reaction media strongly affected gelation time. Thus, in basic media gelation occurred immediately while acid increased gelation time. …
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Quality Soil Management in Illinois Using Winter Cover Crops
… resistance (PR), total porosity (TP), pore size distribution, water retention properties, and saturated hydraulic conductivity (K sat). Compared to winter fallow, crop sequences that included WCC provided substantial benefits from the soil productivity standpoint. In particular, the …
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