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 77 for “"High thermal conductivity"”.
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Novel Charging Station and Computational Modeling for High Thermal Conductivity Heat Pipe Thermal Ground Planes
Thermal ground planes (TGPs) are planar, thin (thickness of 3 mm or less) heat pipes which use two-phase heat transfer. TGPs are innovative high-performance, integrated systems able to operate at a high power density with a reduced weight and temperature gradient. Moreover, being able to dissipate …
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1D-to-3D transition of photon heat conduction in polyethylene using molecular dynamics simulations
… stretching of bulk polyethylene can increase its thermal conductivity by more than two orders of magnitude, from 0.35 W/mK to over 40W/mK, which is comparable to steel. This strong effect is believed to arise from the increased alignment of the constituent polymer chains, which are thought to have …
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Investigating physical properties of novel carbon-based materials
… aerogels, single-walled carbon nanotubes, and high thermal conductivity graphitic foams. The experimental technique of Raman laser spectroscopy yields structural information about all of these materials that we are investigating, including how the covalent bonds between the carbon atoms in the …
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Transport of phonons and electrons in thermoelectric materials and graphene
… or vice versa, require both extremely low thermal conductivity and high thermoelectric power factor. However, a good understanding of low thermal conductivity is still lacking even for several good thermoelectric materials that have been studied over several decades. For the information …
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Investigation on thermal conductivity and AC impedance of graphite suspension
… suspensions of nanoparticles, have substantially higher thermal conductivity than that of the base fluids. However, the reported high thermal conductivity sometimes cannot be reproduced. Theoretically, potential mechanisms leading to this enhancement are still under scrutiny. In this thesis, we …
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Manipulating graphene's lattice to create pseudovector potentials, discover anomalous friction, and measure strain dependent thermal conductivity
… Dirac fermions; graphene has a record high Young's modulus but extremely low bending rigidity; and suspended graphene exhibits very high thermal conductivity. These properties are made more intriguing because with a thickness of only a single atomic layer, graphene is both especially …
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Probing extraordinary nanoscale energy transfer using bimaterial microcantilevers
… near-field radiation beyond Planck's law, high thermal conductivity polymers and the optical absorption of micro/nanostructures. First, surface phonon polaritons, which is one type of electromagnetic surface waves, are demonstrated to enhance the thermal radiation between two surfaces at …
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Carbon nanotube interconnects for IC chips
… conductors, CNTs are capable of carrying higher current densities of up to 10¹⁰A/cm² and high thermal conductivity. This thesis examines the technological aspect of carbon nanotubes - how these tubes can excel in place of copper in terms of their performance and integration into the …
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First-principles study of phonon drag effect in SiGe alloys
… coefficient, absolute temperature, electrical conductivity and thermal conductivity) are promising candidate materials for efficient solid-state devices for electricity generation, cooling and refrigeration. Over the past decades, there has been great progress in enhancing the zT values of …
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Methods for increasing the thermal conductivity of ultra-high molecular weight polyethylene (UHMWPE)
… to determine methods for producing ultra-high molecular weight polyethylene with high thermal conductivity by way of polymer chain orientation. The first portion of this report surveys current research involving polyethylene chain orientation and manufacturing. This section includes …
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Alloying effects on high-temperature deformation behavior of nickel aluminide intermetallics
… the possibility of using nickel aluminide for high temperature structural applications. NiAl is a desirable candidate based on its low density, high thermal conductivity, high melting temperature, and its proven oxidation resistance. Currently, limited ductility at lower temperatures and low …
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Modulation-Doped Field-Effect Transistors for High-Power Microwave Applications
… and sequential wet and dry selective etching. A high linearity of device characteristics is important to minimize intermodulation of high frequency signals under high-power operation. The linearity of device performance is investigated through the comparison of InGaAs/GaAs PHEMTs and doped …
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Synthesis and oxidation behavior of Cr alloyed uranium borides at high temperatures
… investigated as a candidate fuel form for its high thermal conductivity, high melting point, high uranium loading, and potential for dual use as a fuel and burnable absorber. In this work, the synthesis, structural behavior, and oxidation behavior of uranium borides and chromium- and yttrium- …
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Thermal Characterization of Graphitic Carbon Foams for Use in Thermal Storage Applications
<p>Highly conductive graphitic foams are currently being studied for use as thermal conductivity enhancers (TCEs) in thermal energy storage (TES) systems. TES systems store energy using the latent heat capacity of phase change materials (PCMs). Due to the low thermal conductivity of most PCMs, TCEs …
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Characterization of Diamond-Semiconductor Interfaces
The extremely high thermal conductivity of diamond thin films makes them an ideal candidate for heat spreaders that can be integrated with electronic devices. By more effectively dissipating the heat generated during operation device dimensions can be shrunk increasing yield, performance losses due …
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Design of a high performance liquid-cooled lithium-ion battery pack for automotive applications
… cooled lithium ion battery module for use in high power automotive applications such as an FSAE Electric racecar. The motivation for liquid cooling in this application is presented with an adiabatic battery heating simulation followed by a discussion of axial cooling based on the internal …
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Band Offset Measurements of ε-(InxGa1-x)2O3/AlN using X-ray Photoelectron Spectroscopy
… such as deep ultraviolet photodetectors, high-electron-mobility transistors, and high-power electronic devices, InGaO/AlN heterojunctions hold significant promise due to their ultra-wide band gap, tunable polarization properties, and optimized spectral response. In this regard, the …
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Fullerene C60 based nanostructures by self-assembly and molecular recognition
… because of their low atomic number, superior thermal shock resistance, higher melting temperature (graphite sublimes at ~3600K), high thermal conductivity and low neutron activation. So, studying how irradiation changes the structure and properties of solid targets is necessary in order to …
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n-type silicon-germanium based terahertz quantum cascade lasers
… devices could offer significant benefits. The high thermal conductivity of Si may allow higher operating temperatures, removing the need for large and costly cryogenic coolers, and the non-polar nature of Si may allow a wider range of emission frequencies. The mature Si processing technology …
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Large scale production of single wall carbon nanotubes
… notable of said properties include electrical conductivity (metallic and semiconducting), high thermal conductivity, directionality in both electrical and thermal conductivity, high geometric aspect ratio (about 1nm diameter and up to 1 micron or greater length), unprecedented tensile strength …
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