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Articles 1 - 4 of 4
Full-Text Articles in Engineering
Thermodynamic Investigation Of Yttria-Stabilized Zirconia (Ysz) System, Mohammad Asadikiya
Thermodynamic Investigation Of Yttria-Stabilized Zirconia (Ysz) System, Mohammad Asadikiya
FIU Electronic Theses and Dissertations
The yttria-stabilized zirconia (YSZ) system has been extensively studied because of its critical applications, like solid oxide fuel cells (SOFCs), oxygen sensors, and jet engines. However, there are still important questions that need to be answered and significant thermodynamic information that needs to be provided for this system. There is no predictive tool for the ionic conductivity of the cubic-YSZ (c-YSZ), as an electrolyte in SOFCs. In addition, no quantitative diagram is available regarding the oxygen ion mobility in c-YSZ, which is highly effective on its ionic conductivity. Moreover, there is no applicable phase stability diagram for the nano-YSZ, which …
Development Of Novel, Microscale Fracture Toughness Testing For Adhesives, Dillon S. Watring
Development Of Novel, Microscale Fracture Toughness Testing For Adhesives, Dillon S. Watring
FIU Electronic Theses and Dissertations
The purpose of this thesis was to develop microscale fracture toughness tests to be performed in situ based off previously used macroscale fracture toughness tests. The thesis also was to use these tests to perform in situ analysis and imaging of reinforced adhesives during crack propagation. Two different fracture toughness tests were developed for this thesis through developing fixtures and sample geometry. A microscale double cantilever beam (DCB) test was developed for mode I fracture (opening mode). A microscale end notch flexure (ENF) test was developed for mode II fracture (sliding mode).
Three different types of materials were used as …
Nano-Confined Metal Oxide In Carbon Nanotube Composite Electrodes For Lithium Ion Batteries, Alexandra J. Henriques
Nano-Confined Metal Oxide In Carbon Nanotube Composite Electrodes For Lithium Ion Batteries, Alexandra J. Henriques
FIU Electronic Theses and Dissertations
Lithium ion batteries (LIB) are one of the most commercially significant secondary batteries, but in order to continue improving the devices that rely on this form of energy storage, it is necessary to optimize their components. One common problem with anode materials that hinders their performance is volumetric expansion during cycling. One of the methods studied to resolve this issue is the confinement of metal oxides with the interest of improving the longevity of their performance with cycling. Confinement of metal oxide nanoparticles within carbon nanotubes has shown to improve the performance of these anode materials versus unconfined metal oxides. …
Deposition Of Copper Nanoparticles On 2d Graphene Nanoplatelets Via Cementation Process, Luiza Da Fontoura
Deposition Of Copper Nanoparticles On 2d Graphene Nanoplatelets Via Cementation Process, Luiza Da Fontoura
FIU Electronic Theses and Dissertations
The main goal of this thesis is to deposit metal particles on the surface of 2D nanoplatelets using a controlled cementation process. As a proof of concept, copper (Cu) and Graphene Nanoplatelets (GNP) were chosen as the representative metal and 2D nanoplatelets, respectively. Specific goals of this study include depositing nanometer scale Cu particles on the surface of GNP at a low concentration (approximately 5 vol.%) while maintaining clustering and impurities at a minimum. Parametric studies were done to attain these goals by investigating various metallic reducer types and morphologies, GNP surface activation process, acid volume % and copper (II) …