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 252 for “"carbonaceous"”.
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Nanostructured carbohydrate-derived carbonaceous materials
… as an efficient route to nanostructured carbonaceous materials. HTC is an aqueous-phase, low-temperature (e.g. 130 – 200 °C) carbonisation, which proceeds via dehydration / poly-condensation of carbon precursors (e.g. carbohydrates and their derivatives), allowing facile access to highly …
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The Elastic Properties of Carbonaceous Chondrites
… and Tagish Lake meteorites (ungrouped C2 carbonaceous chondrite) indicate variation in fragmentation behavior. The steeper size distribution of the carbonaceous lithology apparently reflects its lower strength. A comparison between the smooth and rough terranes on Itokawa shows that …
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Characterization of Carbonaceous Exsolvate from Metal Melts
… the strengthening of steel by characterizing the carbonaceous exsolvate from a metal-carbon melt. Metal-carbon matrix composites, such as the material used in this investigation, are commonly employed to strengthen tool steel. Structural analysis techniques including scanning electron microscopy, …
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Oxocarbon-derived porous carbonaceous materials for electrocatalysis
… and provide new insights of developing advanced carbonaceous materials for electrocatalysis. In Chapter 2, red carbon oligomer was used as the precursor for the synthesis of carbons. This precursor without inactive C-H bond can undergo crosslinking with the only release of edge CO2 groups, …
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Synchrotron Based Infrared Microspectroscopy of Carbonaceous Chondrites.
… and inorganic minerals are investigated in five carbonaceous chondrites, Northwest Africa 852 (CR2), Tagish Lake (C2-ungroupped), Orgueil (CI1), Sutter's Mill (CM), and Murchison (CM2), with micron spatial resolution using synchrotron-based imaging micro-FTIR spectroscopy. Correlations based on …
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Stochastic modelling of the growth of carbonaceous materials
… involving key molecules that constitute carbonaceous materials, namely polycyclic aromatic hydrocarbons (PAHs), by applying a detailed particle model solved with a stochastic numerical method. In particular, a Kinetic Monte Carlo (KMC) algorithm is used to study the time-dependent …
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Quantitative geometric model of connected carbonaceous material in mudrocks
… rocks. Recent observations of nanopores within carbonaceous material in mudrocks have led to the hypothesis that such material provides conduits for gas migration within the mudrock matrix. This hypothesis requires that the carbonaceous material exist not as isolated grains but as connected …
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Towards greener stationary phases : thermoresponsive and carbonaceous chromatographic supports
Polymers which are sensitive towards external physical, chemical and electrical stimuli are termed as ‘intelligent materials’ and are widely used in medical and engineering applications. Presently, polymers which can undergo a physical change when heat is applied at a certain temperature (cloud …
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Modelling the self-assembly and structure of carbonaceous nanoparticles
The self-assembly and structure of carbonaceous particles are investigated using molecular modelling methods. This provides a deeper understanding of molecular interactions relevant to pollutant formation and growth in combustion processes and other carbon-based applications. The existing soot …
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Rb-Sr age determination of the carbonaceous chondrite "Murray"
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1964.
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Natural carbonaceous materials for use in transparent Joule heaters
Natural carbonaceous materials have the potential to be used in a new class of more economically and environmentally sound electronic devices due to their tunable conductivity as well as robust mechanical and thermal properties. This study aims to explore the potential of steam cracker tar (SCT), a …
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Chuaria, Vendotaenia, and the taphonomy of the Carbonaceous Compression
Carbonaceous Compressions are a widespread preservational style for fossils, yet their taphonomy remains poorly understood. Previous studies focusing on the taphonomy of carbonaceous compressions have primarily looked at exceptionally preserved faunas in plane view. The precious nature of these …
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The Preparation, Functionalization and Biomedical Applications of Carbonaceous Nanomaterials
… and potential biomedical applications of various carbonaceous nanomaterials. Trimetallic nitride template endohedral metallofullerenes (TNT-EMFs, M₃N@C₈₀, M = Gd, Lu, etc.) are some of the most promising materials for biomedical applications. Water-soluble Gd₃N@C₈₀ was prepared by the …
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Effect of Iron on the Oxidative Capacity of Carbonaceous Nanoparticles
… of these detrimental effects. Trace metals and carbonaceous material of the nanometer-sized particles contained in PM<sub>2.5 </sub>have been implicated as key players in causing these effects. Here, the role of Fe is investigated with carbonaceous nanoparticles (CNP) while mimicking simple …
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Electrochemical Carbon Dioxide Reduction for Renewable Carbonaceous Fuels and Chemicals
Electrochemical CO2 reduction reaction (ECO2RR) powered by renewable electricity possesses the potential to store intermittent energy in chemical bonds while producing sustainable chemicals and fuels. Unfortunately, it is hard to achieve low overpotential, high selectivity, and activity …
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Effect of Carbonaceous Nanoparticles on Naturally Occurring Iron Reduction by Carboxylates
… understood. In the current study, the effect of carbonaceous nanoparticles (CNPs), contained within ultrafine PM (particle diameter ≤ 100 nm), is investigated on naturally occurring processes that increase the abundance of bioavailable iron. Enhancing iron bioavailability (i) increases primary …
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Modelling and simulation of fluidized-bed boilers and gasifiers for carbonaceous solids.
… (c) Solid compositions of the coal (or any other carbonaceous material), limestone and inert in the bed and throughout the freeboard. The considered components are: C, H, 0, N, S, ash, volatiles, moisture in the coal, CaCO3, CaO, CaSO4 , moisture in the limestone, Si0 2 , and moisture in the …
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Catalytic reduction of nitric oxide by solid carbonaceous material under lean condition
… reduction of nitric oxide (NO) with solid carbonaceous materials to N_2 was also investigated over palladium based catalysts. Catalysts consisting of 4 wt.% Palladium on CeO_2, A1203 and TiO_2, prepared by the impregnation method, were evaluated as lean NO_x control catalysts with granular …
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In Situ Characterization of Optical Absorption by Carbonaceous Aerosols: Calibration and Measurement
… of both measurements. The light absorption of carbonaceous aerosols was also investigated to provide fundamental understanding to the absorption mechanism. The first topic of interest in this dissertation is the development of calibration nanoparticles. In this study, bionanoparticles were …
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Characterization of carbonaceous aerosols from biofuel combustion: emissions and climate relevant properties
… on climate is significant but highly uncertain. Carbonaceous aerosols, composed of black carbon (BC) and organic carbon (OC), are important to understand aerosol radiative forcing due to their prevalence in the atmosphere. Biofuel combustion is responsible for nearly 20% of primary BC and OC …
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