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 141 for “"SPECIFIC SURFACE AREA"”.
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Evaluation of the effect of fines on asphalt concrete
… This research consists of the evaluation of the surface area of different aggregates used in the state of West Virginia. This factor is important because the amount of asphalt needed to coat the aggregate depends on the specific surface area of the aggregate blend. The specific surface area of …
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The role of micropore size and chemical nature of the pore surface on the adsorption properties of activated carbon fibers
… activated carbon fibers (ACF) with a range of surface areas from 760 $\rm m\sp2/g$ to 2420 $\rm m\sp2/g,$ prepared from phenolic precursors were examined with acetone, n-butane, benzene and nitrogen. The experimental results revealed a counter-intuitive relationship demonstrating that lower …
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Ti3C2Tx as an Advanced Support Material for Polymer Electrolyte Fuel Cell Catalysts to Facilitate the Oxygen Reduction Reaction
… phases. The synthesis of high (>50 m2 g -1 ), specific surface area, delaminated Ti3C2Tx flakes was attempted first with mild in-situ HF conditions. While this method could both etch and delaminate flakes in a single stage, because the flake size remained large and unchanged, the specific …
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Synthesis and Environmental Applications of Mesoporous Alumina
… afforded mesoporous alumina materials with high specific surface area, large pore volume, and large pore width. This study showed that the specific surface area and porosity of alumina can be tuned to some degree by varying the polymer concentration and/or nitric acid concentration in the …
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Design of Titania Photocatalytic Membranes containing Fine Ceramic Fibres
… within the membranes, along with their porosity, specific surface area and mechanical properties, have been examined. These NAF-SAF membranes were impregnated with titania-based sol-gel coatings, to produce photocatalytic membranes. Their mechanical properties, specific surface area and flow …
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ΜΕΛΕΤΗ ΕΠΙΦΑΝΕΙΑΚΩΝ ΙΔΙΟΤΗΤΩΝ ΚΑΙ ΚΑΤΑΛΥΤΙΚΗΣ ΔΡΑΣΤΙΚΟΤΗΤΑΣ ΠΑΡΑΣΚΕΥΑΣΜΑΤΩΝ ΥΔΡΟΞΕΙΔΙΩΝ ΤΟΥ ΑΡΓΙΛΙΟΥ
… WAS THE PREPARATION OF ALUMINUM HYDROXIDES WITH SPECIFIC SURFACE PROPERTIES AND CATALYTIC. THESE MATERIALS WERE PREPARED BY THE HYDROLYSIS OF ALCL3.6H2O IN AQUEOUS OR ALCOHOLIC SOLUTIONS AS WELL AS IN MIXED WITH ETHANOL AND ACETON AQUEOUS SOLUTIONS. AS PRECIPITATION AGENTS WERE USED THREE PRIMARY …
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The preparation of solid core drug delivery system (SCDDS) via supercritical processing of fatty acids
… of BSA absorbed was observed with the increasing specific surface area of silica particles. Isotherms demonstrated that maximum absorption of BSA can be achieved at or close to the iso-electric point (IEP) of the protein. A SCDDS was prepared by absorbing BSA on silica at pH 5.0 in …
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Study of Freeze-Cast Porous Silica Nanoparticle-Based Composites
… are promising ceramics, as they exhibit high specific surface area, highly porous network, and a surface that can be easily functionalized. This dissertation describes the results of a study on the formation and properties of porous silica nanoparticle-based composites, using techniques of …
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Improvements on carbon nanotube structures in high-energy density ultracapacitor electrode design
… vapor deposition (CVD) to form porous, high-surface area electrodes. We demonstrate that the capacitance of CNT electrodes is very highly correlated to the morphological and geometrical features of the CNT forest. These features, such as areal density, mean nanotube diameter, and nanotube …
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The influence of particle size on the chemistry of mica clays
… electron microscopy (TEM), thermogravimetry, specific surface area analysis, and ion exchange. Books of biotite and muscovite were reduced to clay size « 2.0 μm) particles by mechanical comminution, then further fractionated into coarse (0.2-2.0 μm), medium (0.08-0.2 μm), and fine (< 0.08 μm) …
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Sintering of Co2MnO4 spinel for protective coatings in SOFC
… and reverse micelle) and the obtained specific surface area, structure and particle size were correlated with thermal behaviour, sintering temperature and achieved density. It was found that regardless the synthesis process the only obtained phase is Co2MnO4. Specific surface area from …
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The effect of flower-like tatania towards characteristics and performance of polysulfone mixed matrix membrane
… With consideration of the FLT that offer larger specific surface area as compared to ST that able to generate better performances and properties of polymer MMM. In this work, the polymer MMM of PSf/FLT and PSf/ST membranes were prepared via phase inversion method at five different concentrations …
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Synthesis and characterisation of hypercrosslinked polymer microparticles and their functionalised derivatives
High specific surface area, microporous polymer particles were prepared successfully by using gel-type precursor particles, derived from non-aqueous dispersion (NAD) polymerisations of monomers in ethanol, in hypercrosslinking reactions. The precursor particles (containing 1 wt% of crosslinker) …
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Oxocarbon-derived porous carbonaceous materials for electrocatalysis
… the necessity for advanced carbon materials with specific structural and functional attributes. Porous carbon materials, characterized by their high specific surface area and tunable pore structures, are particularly promising for electrocatalysis. However, the rational design of functional …
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The Role of Carbonaceous Materials in Pavement Dust, Soils, and Lake Sediments on the Fate of Organic Pollutants in Small Urban Watersheds
… Fourier transform infrared spectroscopy, specific surface area measurement, and solid state 13C nuclear magnetic resonance spectroscopy. Sorption isotherms of phenanthrene to these fractions and bulk samples fitted with Freundlich models are nearly linear (N = 0.90--1.00), suggesting a …
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Solid oxide fuel cell electrolytes produced via very low pressure suspension plasma spray and electrophoretic deposition
… SOFC suspension based feedstock on complex surfaces, such as in non-planar SOFC designs. Dense, thin electrolytes of ideal composition for SOFCs can be fabricated with each of these processes, while compositional control is achieved with dissolved dopant compounds that are incorporated into …
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Fabrication and characterization of hollow silica aerogel spheres using sol-gel processing in the dual nozzle generation system
… silica-aerogel sphere formation is reported. Specifically, the optimum rheology and stoichiometry of the reactant solution, the make-up of the gelation/levitation gas mixture, and the characteristics of the resulting silica-aerogel spheres, such as size, thickness, porosity, pore size, and …
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Soil and Site Characterization Using Electromagnetic Waves
… to determine the volumetric water content, specific surface area and pore fluid salt concentration simultaneously from the dielectric spectrum; (3) Deduction of the wide-frequency electromagnetic properties of a soil by measuring its responses to a step pulse voltage using time domain …
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ΜΕΛΕΤΗ ΤΟΥ ΜΗΧΑΝΙΣΜΟΥ ΠΡΟΚΑΤΕΡΓΑΣΙΑΣ ΓΙΑ ΤΗΝ ΜΕΤΑΤΡΟΠΗ ΤΗΣ ΒΙΟΜΑΖΑΣ ΣΕ ΚΑΥΣΙΜΑ ΚΑΙ ΧΗΜΙΚΑ: ΕΠΙΔΡΑΣΗ ΣΤΗ ΣΤΕΡΕΑ ΦΑΣΗ
… AND CHEMICAL PRETREATMENTS ON THE PARTICLE SIZE, SPECIFIC SURFACE AREA, CRYSTALLINITY INDEX, CHEMICAL COMPOSITION, DENSITY OF WHEAT STRAW IS EXAMINED. THE PHYSICAL PRETREATMENTS STUDIED WERE HAMMER - AND BALL-MILLING. THE CHEMICAL PRETREATMENTS UTILIZED WERE DELIGNIFICATIONS WITH AQUEOUS ALKALINE …
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ADVANCING MULTIPHASE PROCESS DEVELOPMENT WITH HYBRID PHYSICS-BASED – MACHINE LEARNING MODELS
… in such systems, as it determines interfacial area and mass transfer characteristics, both of which impact reaction performance. A workflow is developed to extract hydrodynamic descriptors and estimate interfacial area in a liquid–liquid system in a microreactor. High-speed imaging and computer …
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