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 141 for “"Active material"”.
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Cellular And Mechano-Active Material Approaches To Improve Disc Repair After Herniation
The intervertebral disc (IVD) relies on its complex microarchitecture and composition to transmit forces throughout the spine. A nucleus pulposus (NP) core is surrounded circumferentially by the annulus fibrosus (AF), which together transmit loads to adjacent vertebra. Although this specialized …
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Physics-based and data-driven modeling of multi-active material electrode batteries
… to hybrid electrodes with blends of two or more active materials to enhance battery performance. Leveraging best properties of each material, these multi-active material electrodes open a new and complex design space that could be more efficiently explored through physics-based simulations, …
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Sodium-Ion Battery Cathode Active Material Cost Drivers and Manufacturing Scale-up Barriers
… dominated by lithium-ion batteries, but cost and materials supply are concerns. Sodium is more abundant and cheaper to mine and refine than lithium, positioning sodium-ion batteries to be a potential grid storage solution. However, researchers working at the lab-scale have yet to build consensus …
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Three-dimensional electronic resistivity mapping of solid electrolyte interphase and anode active material in lithium-ion batteries
… the degradation of electronic conductivity of Si active material through electrochemical cycling is believed to be partially responsible for capacity fade in the Si-based anode. However, the in-situ measurement of electronic resistivity of SEI and Si active material has been complicated by ion …
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Pathways to next-generation redox flow batteries
… model, which explicitly quantifies RFB redox active material, salt, and solvent costs. TE model results identify active species concentration and cell voltage as critical cost-constraining parameters for nonaqueous and aqueous RFBs respectively. Active species concentration targets for NAqRFBs …
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High force density linear permanent magnet motors : "electromagnetic muscle actuators"
… counterparts, inspiring the development of new, "active material" actuators. This thesis reconsiders a traditional actuator, the linear permanent magnet motor, as a form of active material actuator, and presents new, unified scaling and magnetic field models for its performance. This active …
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Stochastic recruitment strategies for controlling artificial muscles
… presents a new architecture for controlling active material actuators inspired by biological motor recruitment. An active material is broken down into many small fibers and grouped together to form one large actuator. Each of these fibers is held in a binary state, either relaxed or …
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PEG-coated Fe3O4 for li-Ion battery anodes: Effects of crystallite size and surface chemistry
… are complex mesoscale systems comprised of an active material, conductive agent, current collector, and polymeric binder. Previous work focused on enhancing electron and ion transport in high capacity anode systems by introducing poly[3-(potassium-4- butanoate) thiophene] (PPBT) as a binder …
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Preparation and Electrochemical Testing of Flexible Carbon Nanofiber Electrodes from Electrospinning
… the fiber diameter, the bulk porosity of the material, and flexibility of the final carbon electrode. Higher porosity mats electrospun in a high relative humidity environment prevented fiber sintering, which if not minimized, resulted in non-flexible carbon electrodes. Both flexible and …
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Fundamental understanding of re-dispersion of cobalt on supported model Fischer-Tropsch catalysts
… study was to investigate how the catalytically active material may redisperse during consecutive oxidation-reduction steps (OROR) for a model supported-cobalt catalyst to give insight into the regeneration process of a spent supported-cobalt FTS catalyst.
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Microstructure Engineering of All-Solid-State Composite Electrodes
… engineering and the development of novel organic active materials for high-performance SSBs. It begins with a review of key challenges associated with composite cathodes and current solutions. Chapter 2 explores strategies using organic cathodes to address these challenges from microstructural, …
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Mechanics of lithium-ion battery electrodes
… such as in electric vehicles. Key areas of active research that offer potential to improve lithium-ion batteries include the development of new anode and cathode materials and new electrolytes, a more complete understanding of in situ and artificial interfacial stabilization processes at the …
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Design, synthesis, and characterisation of transition-metal dicarboxylate anodes for lithium-ion batteries
… limited, expensive, non-renewable, and toxic materials. To ensure future proofing of battery technology, new materials and methods that overcome the current shortcomings need to be developed. The work in this thesis develops the use of transition-metal dicarboxylates as anode materials for Li …
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Optimisation of Valve Regulated Lead Acid Battery Design for High Power Applications
… Initial research indicated that the positive active material (PAM) was the major cause for the low discharge performance with the electrochemical analysis of the battery showing the presence of significant levels of unconverted lead sulphate (5.52%). PAM microstructure investigation and …
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Beyond Lithium-Ion Technology: Lithium-Sulfur and Potassium-Ion for Better and Cheaper Batteries
… LSBs interlayer, for the first time, to mitigate active material loss. The composite prepared has a large TiO2 content that can chemically trap polysulfides and a high porosity CNF scaffold for physically hosting the polysulfides. The combined results in the interlayer increase initial discharge …
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Model to Evaluate the Aerodynamic Energy Requirements of Active Materials in Morphing Wings
… of morphing wings and the requirements for the active material actuators in the wings.
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MATHEMATICAL MODELING OF LIAL/FES¬2 HIGH TEMPERATURE BATTERY SYSTEM
… includes the effects of precipitation salt on active area in the electrode and the discharge capacity. In addition, the model also takes the change in volume of the active material into account during the electrochemical reactions by incorporating the change in porosity of the electrode and the …
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Design and Optimization of Nanoplasmonic Waveguide Devices
… a method for the sensitivity analysis of active nanophotonic waveguide devices to variations in the dielectric permittivity of the active material. More specifically, we present an analytical adjoint sensitivity method for the power transmission coefficient of nano optical devices, which …
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Optical diagnostics of lithium-sulfur and lithium-ion battery electrolytes using attenuated total reflection infrared spectroscopy
… in Li-S batteries, which leads to loss of active material and lowers lifetimes. The cell was also used to study electrolyte decomposition in Li-ion batteries, which can lead to thermal runaway and catastrophic failure. An optical diagnostic technique to determine the order and concentration …
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A Plastic-Based Thick-Film Li-Ion Microbattery for Autonomous Microsensors
… of the cathodes that use LiAl0.14Mn1.86O4 as active materials, increase active material accessibility, and improve the cycling and power performance without the need of compression. Optimized uncompressed macro cathodes were capable of delivering power densities greater than 50 mW/cm2, …
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