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 20 for “"Thermogravimetric Analyzer"”.
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Activation energy of Douglas fir char gasification by carbon dioxide
… pyrolyzed in nitrogen at 600, 750, and 900°C. A thermogravimetric analyzer provided the weight versus temperature data used to obtain the activation energies. The Coats-Redfern integral method of kinetic analysis was used to extract the activation energies from the data. This method can be used …
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A Study of On-line Analysis of Hydrogen Chloride Evolution During Coal Combustion
This study involved the use of a thermogravimetric analyzer (TG) interfaced with a fourier transform infrared spectrometer (FTIR) and a mass spectrometer (MS) to determine the evolution of hydrogen chloride from coal during combustion as a function of the chlorine content and mesh size of the coal. …
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Crosslinked conventional size and nanoparticle size acrylic latexes and their blends: Investigation of the effects of crosslinking, particle size and distribution, glass transition temperature and blending on film formation, properties and morphology
… instruments such as a dynamic mechanical analyzer (DMA), thermogravimetric analyzer (TGA), modulated differential scanning calorimeter (MDSC), nano-indenter, and atomic force microscope (AFM). The results showed significant improvements in acrylic latex performance proposing coatings near …
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Char Reaction Kinetics in a Transport Gasifier
… Also quantitative tests were preformed using a thermogravimetric analyzer (TGA) to generate kinetic equations as well as analyze the effects of steam injection. Utilizing these two analysis techniques, a better understanding of the gasification process as it relates to the interaction with the …
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Impacts of Vanadium and Coke Deposition on CO2 Gasification of Nickel Catalysts Supported on Activated Carbon from Petroleum Coke
… coke, were investigated at 700-900 °C using a thermogravimetric analyzer (TGA). The catalysts were coked by exposure to ethylene at 400-600 °C and/or impregnated with ~3.5 and 8.5 wt% vanadium, which is typically deposited during hydrodemetalization (HDM) of heavy oil. The gasification rates of …
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Thermophysical Properties and Microstructural Changes of Composite Materials at Elevated Temperature
… differential scanning calorimeter (DSC) / thermogravimetric analyzer (TGA). Experimental techniques were developed for quantitative specific heat measurement based on ASTM standards with modifications for accurate measurements of decomposing materials. An environmental scanning electron …
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Pyrolysis and Hydrodynamics of Fluidized Bed Media
… heat data were obtained from a simultaneous thermogravimetric analyzer (DSC/TGA). A method was developed to combine data in an energy balance and determine an optimized heat of decomposition value. This method was effective for modeling simple reactions but not for complex decomposition. …
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Effect of Vanadium on High Temperature Corrosion of Alloy Steel
… air and SO2. The experiments were carried out in Thermogravimetric Analyzer (TGA) which is an equipment that helps study high temperature corrosion. The TGA results for air showed that the corrosion resistance of T9 and T91 was better than T22 under tested conditions. The oxidation kinetics were …
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Development and characterization of electrically conductive thermoplastic based composite materials for fuel cell bipolar plates
… technique in a twin-screw extruder. Thermogravimetric Analyzer (TGA), Differential Scanning Calorimetry (DSC), Digital microscope, and Scanning Electron Microscope (SEM) were used for thermal and morphological characterization. The flexural strength testing of the composites was …
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The Mechanical Thermal and Microstructural Behaviors of the Strip Silicates Reinforced Epoxy-based Nanocomposites
… it was further verified by Dynamic Mechanical Analyzer (DMA), Thermomechanical Analyzer (TMA) and Thermogravimetric Analyzer (TGA) that there was no significant change of elastic modulus, glass transition, thermal expansion and decomposition temperature in the nanoclay-epoxy samples when …
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Thermodynamic and Thermochemical Investigation of Advanced Triso Coated Particle Fuels
… this research, techniques were developed using a Thermogravimetric Analyzer (TGA), which can very accurately monitor mass change of a sample as a function of temperature and time. It is also hoped that the methods used in this research will be utilized in order to model and analyze the properties …
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Experimental and Theoretical Studies of Kinetics and Quality Parameters to Determine Spontaneous Combustion Propensity of U.S. Coals
… facility that features adiabatic self-heating, thermogravimetric analyzer (TGA) and USBM self-heating temperature methods in the mine ventilation laboratory at West Virginia University.;• Correlation of U.S. coal rank and propensity for spontaneous combustion has been studied by classifying …
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Experimental investigation of U-Pipe evacuated tube solar collector: thermal performance enhancement methodology
… a dispersant. The samples were each tested in a Thermogravimetric Analyzer (TGA) and Differential Scanning Calorimeter (DSC) to analyze their thermal properties. To assess homogeneity of the MWCNT dispersion, scanning electron microscopy was also performed. Performance enhancement to both the …
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Investigation of adsorbent-based warm carbon dioxide capture technology for IGCC system
… high pressure microbalance system and a thermogravimetric analyzer. Experimental data indicate the sorbent has a fairly large regenerable capacity in 180-240 °C temperature range, fast kinetics, low heat of adsorption, and stable working capacity for at least 84 cycles. The new sorbent …
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Oxidation behavior of very high temperature reactor (VHTR) candidate materials: 316l stainless steel, Alloy 617, and Incoloy-800H
… layered external oxide scale was formed. A thermogravimetric analyzer, scanning electron microscopy/energy dispersive X-ray spectroscopy, and X-Ray diffraction were among the analytical techniques used.
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Synthesis and application of a grafted flocculant produced from a chemical combination of a bioflocculant TKT and acrylamide (AM)
… electron microscopy (SEM), Zetasizer Nano, Thermogravimetric Analyzer (TGA) and Fourier Transform Infrared (IR) Spectrophotometry. A diphenyl tetrazolium bromide (MTT) assay was used to determine the biosafety of the grafted bioflocculant. The effect of dosage size on flocculating activity …
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Hydro/Solvothermal Synthesis, Structures and Properties of Metal-Organic Frameworks Based on S-Block Metals
<p>Carbon dioxide removal from flue gases of power plants is critical for reduction of greenhouse gas emissions implicated in global warming. Metal Organic Frameworks (MOFs) promising potential applications in carbon dioxide capture due to their unique structural properties such as high porosity …
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Sacrificial polymers for rapid manufacturing of bioinspired vascular materials
… catalysts are compared via mass loss in a thermogravimetric analyzer (TGA). A 10x improvement in mass loss kinetics of PLA is observed with tin acetate. PLA films blended with tin acetate are then embedded in a host matrix and successfully evacuated in a heated oven at temperatures as low …
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Use of ultrasonication, thermogravimetric analysis and newly developed hot-air drying platform for evaluation and optimization of drying processes of agricultural materials
… ultrasound pretreatment was shown to reduce the thermogravimetric analyzer (TGA) drying time by up to 22%, yielding products with lower equilibrium moisture content (which can improve shelf-life), and increasing the hydration rate and equilibrium moisture content of hydrated grains. The second …
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Synthesis and characterization of zinc nanoparticles using consortium of bioflocculant-producingmicroorganisms isolated from uMlalazi catchment, KZNand their application for wastewater treatment
… transform infrared spectroscopy (FT-IR), and thermogravimetric analyzer(TGA). Spectrophotometrically, the pH and thermal stabilities of bioflocculants were assessed. The cytotoxicity, solubilityand antimicrobial activity effects werealso investigated. The purified bioflocculants were also …