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 31 for “"Carbon nanofibers"”.
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Field ionization from carbon nanofibers
The Micro Gas Analyzer project aims to develop power-efficient, high resolution, high sensitivity, portable and real-time gas sensors. We developed a field ionizer array based on gated CNTs. Arrays of CNTs are used because of their small tip radii and high aspect ratio which yields high electric …
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High strength carbon nanofibers derived from electrospun polyacrylonitrile
Carbon nanofibers (CNFs) derived from polyacrylonitrile (PAN) have not yet demonstrated the high tensile strength and Young’s modulus of their microscale counterparts. This is due to the current lack of understanding of the effect of electrospinning conditions on the quality of PAN precursor …
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Mechanical and interfacial properties of carbon nanofibers for polymer nanocomposites
… mechanical and failure response of vapor grown carbon nanofibers (VGCNFs) has been unexplored despite the large volume of carbon nanofiber composites fabricated today. Three grades of VGCNFs, namely as-fabricated, high temperature heat treated, and graphitized/surface oxidized, with average …
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High Performance Electrode Materials From Carbon Nanofibers with Tunable Pore Architectures
… interface. High surface area carbon and electrolytes with higher working voltage window are the key components to improve the energy density of EDLCs. Novel polyimide (PI) precursors were synthesized and tested for electrochemical performance. The polymers were electrospun to …
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Removal of uranium from aqueous wastes using electrically charged carbon nanofibers
… over other methods. The technique utilizes carbon nanofibers as electrodes which successfully electrosorb uranium ions. Fibers with varying surface characteristics were evaluated in the removal process and all were determined to be equally and extremely effective. Various experimental …
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The formation of carbon nanofibers and thin films from the catalytic decomposition of ethylene by palladium
… catalyst toward the deposition of solid carbon from ethylene in two distinct forms: nanofibers and thin films. Four forms of palladium were tested: sputtered film, foil, sub-micron powder, and nanopowder. The deposition of carbon can be achieved by a very simple method. In this method …
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Characterization of Mechanical Properties at the Micro/Nano Scale: Stiction Failure of MEMS, High-Frequency Michelson Interferometry and Carbon NanoFibers
… also responsible for the adhesion in nonwoven carbon nanofiber networks. Experimental and modeling results are presented for the mechanical and electrical properties of nonwoven (random entanglements) of carbon nanofibers under relatively low and high-loads, both in tensions and compression. It …
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Deposition Thickness Modeling and Parameter Identification for Spray Assisted Vacuum Filtration Process in Additive Manufacturing
… in the model. Experiments involving depositing carbon nanofibers in a sheet of paper are used to measure the ability of the model to mimic the filtration process.
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Development of Carbon Nanofiber Reinforced HNBR Composite for Sealing Applications
Carbon nanofiber(CNF) as a novel filler has been studied by researchers with huge enthusiasm owe to its special properties, like light weight, sustainability of large deformation, chemical stability, corrosion and fatigue resistance, vibration and noise reduction capability, especially in rubber …
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A GAN-Augmented Machine Learning Framework for Predicting Raman Characteristics in Carbon Nanofiber Synthesis
… for predicting the structural quality of Carbon Nanofibers (CNFs) synthesized via Chemical Vapor Deposition (CVD). Building upon prior work employing Conditional Tabular GAN (CTGAN) for data augmentation and XGBoost for quality prediction, this thesis expands the methodology by …
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Analysis of Ionomer-coated Carbon Nanofiber for use in PEM Fuel Cell Catalyst Layers
… a novel electrode design based on ionomer-coated carbon nanofibers is proposed and studied. Governing equations for this design were established, and a mathematical model was created and solved using MATLAB to predict the performance of the new electrode design. A parametric study was performed to …
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Nano-filled Epoxy: Mechanical and Fire Behavior and Modeling of Nanocomposite Columns Under Fire
… used are montmorillonite nanoclays and carbon nanofibers. Three types of nanocomposites are manufactured: epoxy-clay, epoxy-carbon nanofiber, and epoxy-clay-carbon nanofiber nanocomposites. Fracture tests performed include Izod impact and fracture toughness, for the determination of the …
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Local and Effective Mechanical Properties of Polymer Nanocomposites
… shear strength (IFSS) of individual vapor grown carbon nanofibers (VGCNFs) embedded in an aerospace grade epoxy. The IFSS from several experiments with as-grown and non-functionalized VGCNFs was 111+/-32 MPa. This value is up to 24% higher than that of the IFSS of multi-wall carbon nanotubes in …
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Electrospun carbon nanofiber electrodes decorated with palladium metal nanoparticles : fabrication and characterization
… a novel oxygen reduction electrode comprised of carbon nanofibers for use in polymer electrolyte membrane (PEM) fuel cells and metal-air batteries. The process involved electrospinning a solution of polymer (polyacrylonitrile), noble metal salt (palladium (II) acetate), and organic solvent (n,n- …
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Design, Fabrication, Testing of CNT Based ISFET and Characterization of Nano/Bio Materials Using AFM
<p>A combination of Carbon Nanotubes (CNTs) and Ion Selective Field Effect Transistor (ISFET) is designed and experimentally verified in order to develop the next generation ion concentration sensing system. Micro Electro-Mechanical System (MEMS) fabrication techniques, such as photolithography, …
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Mechanical characterization of advanced polyacrylonitrile derived carbon fibers reinforced with carbon nanotubes
… on the mechanical characterization of individual carbon fibers reinforced with carbon nanotubes (CNTs) which were dispersed in the polyacrylonitrile (PAN) precursor. The carbon nanofibers were obtained from the Georgia Institute of Technology and were fabricated in bundles by the …
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Engineering Biological Materials for Carbon Capture and the Electrochemical Reduction of Carbon Dioxide to Light Hydrocarbons
Decarbonization of the global economy will require the identification of substitute carbon sources for the production of fuels, plastics, textiles, pharmaceuticals, and other products that are derived from fossil carbon. The gigaton scale of carbon dioxide emissions necessitates the development of …
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Microstructural manipulation and architecture design of carbon-based electrochemical systems
Carbon materials are important in electrochemistry. The often cited advantages of carbonaceous materials for electrochemical applications include wide potential working windows, tunable electrocatalytic activity for a variety of redox species, and ease of modifications either by covalent or by …
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HIGH TEMPERATURE NANOMANUFACTURING FOR EMERGING TECHNOLOGIES
… temperature annealing (>2500 K) is applied to carbon nanomaterials to address the defects and poor interfacial problems. In the carbon nanofibers (CNFs), the high temperature graphitizes the carbon nanomaterials with significantly improved crystallinity and less defects. Importantly, the rapid …
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