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 32 for “"Carbon nanostructures"”.
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Electron beam characterization of carbon nanostructures
"Atom-thick carbon nanostructures represent a class of novel materials that are of interest to those studying carbon's role in fossil fuel, hydrogen storage, scaled-down electronics, and other nanotechnology. Electron microscope images of "edge-on" graphene sheets show linear image features due to …
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Fullerenes and carbon nanostructures formation in flames
… are molecules comprised entirely of sp2-bonded carbon atoms arranged in pentagonal and hexagonal rings to form a hollow, closed-cage structure. Fullerenes, such as C60 and C70, are single-shell molecules, while carbon nanostructures--a larger class of structures that includes fullerenes as a …
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Manipulation of Carbon Nanostructures for Multifunctional Composite Materials
… of 5:95 wt ratio of ultra-short single walled carbon nanotubes (US-SWCNT):polyacrylonitrile (PAN) were spun using a dry-jet wet-spinning method followed by oxidative stabilization at 285 °C. The as-spun and stabilized composite fibers exhibited a 50 and 40 % increase, respectively, in modulus …
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Transport of molecules through and on carbon nanostructures
Single-layer graphene membranes and other 2D membranes can realize very high gas permeation fluxes due to their atomic or unit cell thickness. Established modeling approaches for membrane transport consider transport through a finite and continuum thickness, and therefore they do not apply to the …
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Growth and characterization of carbon nanostructures on zinc oxide nanostructures
… different hybrid materials based on ZnO and carbon hierarchical nanostructures, and to test their performances when used as chemiresistors to detect low doses (~ ppm) of polluting gases, like ammonia and acetone. Nanostructures of ZnO and carbon, including carbon nanotubes, exhibit on their …
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Synthesis and chemical modification of carbon nanostructures for materials applications
… response, and materials properties of various carbon nanostructures, including single-walled carbon nanotubes (SWCNTs), multi-walled carbon nanotubes (MWCNTs), graphite, and graphene nanoribbons (GNRs). Efficient production and modification of these unique structures, each with their own …
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Carbon nanostructures/tin (IV) oxide systems and transparent electrode application
… electronic properties of sp2 hybridized carbon materials has been attracting an enormous number of researchers around the globe. Some of the efforts, for more than a decade, have been in attempting to replace the conventional transparent electrode indium tin oxide (ITO) with carbon …
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Tunneling spectroscopy of carbon nanostructures: a romance in many dimensions
… various methods of tunneling spectroscopy in carbon nanotubes, which shed light on electron – electron interaction in carbon nanotubes and low dimensional systems in general. We also apply those methods to two dimensional graphene sheets. We first review the fabrication techniques used to make …
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Growth Model, Synthesis of Carbon Nanostructures and Alteration of Surface Properties Using Them
… a much cheaper and higher throughput process for carbon nanotube/nanofiber (CNT/CNF) production compared to conventional catalytic processes like chemical vapor deposition (CVD). Nanostructured carbon materials, such as carbon nanotubes and nanofibers, exhibit superhydrophobic behavior over a …
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Synthesis and characterisation of hybrid Zn0-carbon nanostructures for potential applications in hydrogen storage
… work presents the synthesis of hybrid zinc oxide carbon nanofibers (ZnO-CNFs) using ZnO nanorods as template and to investigate if they can be used as the hydrogen storage materials. The synthesis of ZnO nanoparticles (ZnO NPs) was carried out using direct current (DC) reactive magnetron …
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Engineering carbon nanostructures : development of novel aerogel-nanotube composites and optimization techniques for nanotube growth
Carbon aerogels offer several unique advantages which make them ideal for evaluating a metal's ability to catalyze nanotube growth, including in situ carbothermic reduction of oxidized nanoparticles to their catalytic metallic phase as they form and production of a bulk quantity of nanoparticles …
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Electromagnetic Characterization of Complex-Shaped Carbon Nanotubes Using Characteristic Mode Analysis
… have recently allowed the synthesis of Carbon Nanotubes (CNTs) with controlled complex shapes. For example, CNTs with one or more branches sprouting off the main CNT axis, forming unique Y-shaped and K-shaped carbon nanostructures, have recently been fabricated. The angle at each …
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Electrochemical Behavior of Carbon Nanostructured Electrodes: Graphene, Carbon Nanotubes, and Nanocrystalline Diamond
… to investigate the electrochemical behavior of carbon nanostructures of varying morphology, identify morphological characteristics that improve electrochemical capacitance for applications in energy storage and neural stimulation, and engineer and characterize a boron-doped diamond (BDD) …
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Molecular Simulation Of Nanoscale Transport Phenomena
… reports simulations of (1) ion intake by carbon nanotubes, (2) hydrogen storage in carbon nanotubes, (3) carbon nanotube growth and (4) nanoscale heat transfer. Ion transport is investigated in the context of desalination of a polar solution using charged carbon nanotubes. Simulations …
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Characterization of Carbonaceous Exsolvate from Metal Melts
This study seeks to explore the role of carbon meso-structures in 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. …
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Functional surface chemistry of carbon-based nanostructures
… discovered abilities to synthesize single-walled carbon nanotubes and prepare single layer graphene have spurred interest in these sp2-bonded carbon nanostructures. In particular, studies of their potential use in electronic devices are many as silicon integrated circuits are encountering …
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Fullerene C60 based nanostructures by self-assembly and molecular recognition
… used in space and nuclear reactors. Therefore, Carbon- Carbon composites been an alternative choice for fusion reactor plasma facing components because of their low atomic number, superior thermal shock resistance, higher melting temperature (graphite sublimes at ~3600K), high thermal …
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Electrical Power Generation in Microbial Fuel Cells Using Carbon Nanostructure Enhanced Anodes
… a novel anode design using flame-deposited carbon nanostructures (CNSs) on stainless steel mesh is developed to improve the electron transfer efficiency of electrons from microorganisms to the anode and thus the power densities achievable by MiFCs. These new anodes appear to allow for …
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DEVELOPMENT OF COST EFFECTIVE NANOSTRUCTURAL REINFORCEMENTS FOR ADVANCED COMPOSITES
… structural composites reinforced with complex carbon nanostructures for multiple applications. The main process in this study is mechanical milling which induce the in-situ transformation of carbon in the form of soot into complex nanostructures that behave as effective reinforcements. The soot …
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Thin-film single-walled carbon nanotube transistors fabricated using mechanical meniscus aligned arrays
Single-walled carbon nanotubes (SWNTs) are novel carbon nanostructures with unique properties that have made them highly attractive materials for research in nanotechnology. Due to their exceptional electrical, mechanical, optical and structural properties, SWNTs have potential applications in the …
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