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Full-Text Articles in Physics
Nanoenergetic Gas Generators Based On Metal Hydroxides, Srbuhi Yolchinyan
Nanoenergetic Gas Generators Based On Metal Hydroxides, Srbuhi Yolchinyan
Theses and Dissertations
The metal oxide based nano thermites have been studied extensively, yet another closely related systems based on metal hydroxides were surprisingly overlooked. For the first time, the thermodynamic calculations using HSC Chemistry-7 and Thermo software, were performed for a collection of 22 novel nano-thermite systems based on aluminum and metal hydroxides, and four representative systems based on bismuth, copper, cerium and nickel hydroxides were characterized using differential scanning calorimeter, scanning electron microscope, and pressure discharge dynamic evaluation. The strongest performance was recorded in Al-Bi(OH)3 system with about 4.9 MPa peak pressure for 0.2 g charge mass. Bismuth oxide and hydroxide …
Development Of An Innovative Observational Astronomy Class For High School Students In Collaboration With The University Of Texas/Rio Grande Valley, Alan W. Hendrick
Development Of An Innovative Observational Astronomy Class For High School Students In Collaboration With The University Of Texas/Rio Grande Valley, Alan W. Hendrick
Theses and Dissertations
The vision presented by the National Academy of Science Standards is for all students to spend more time ‘doing’ science in order to develop science literacy and be better prepared not only for college but also in understanding and participation in global current events. A course in observational Astronomy is just that, an opportunity for student to “do ‘science by collaborating with actual scientists in real research. The course follows a path in which students learn foundational knowledge and apply this knowledge to complete a successful celestial observation, interpreting the results by making inferences and predictions. This paper begins with …
Molecular Dynamics Simulations Of Dna Duplex Stretching, Ramin Salimi
Molecular Dynamics Simulations Of Dna Duplex Stretching, Ramin Salimi
Theses and Dissertations
Single-molecule DNA stretching experiments is a an extremely rigorous method to investigate mechanical properties of DNA and how DNA molecule binding to proteins, and other small molecules works. In these experiments, double-stranded DNA molecules are stretched by a force applied to opposite ends of the DNA, e.g., in an atomic force microscope or an optical tweezers instrument. Here we study the stretching behavior of the DNA duplex d(CGCAAAAAAGCG) 2 by molecular dynamics simulations. In particular, we calculate the change in free energy ∆F = ∆U − T ∆S as the DNA duplex is stretched. We seek to show that employing …
Biocidal Defeat Agents Produced By Silver-Iodine Nanoenergetic Gas Generators, Ivan Davila
Biocidal Defeat Agents Produced By Silver-Iodine Nanoenergetic Gas Generators, Ivan Davila
Theses and Dissertations
Nanostructured aluminum (Al), iodine pentoxide (I2O5) nano-rods, and silver oxide (Ag2O) nanoparticles, (Al-I2O5-Ag 2O) were used to compose the ternary thermite composition that serves as a Nanoenergetic Gas Generator (NGG). This composition produces biocidal gases giving the mixture the ability to destroy highly pathogenic microorganisms or bacteria. The dissemination of the biocidal gas in combustion chamber was observed using a high-speed camera. The testing of NGG combustion process against the living Escherichia coli (E.coli) K-12 strain cells, that were cultivated/placed on the sample/chamber surfaces, demonstrated that iodine and silver atoms clouds were deposited to the bacteria surface. The 10/75/15 wt …
Thermal Consolidation Of Dredge Sand For Artificial Reef Formations, Alexandro Trevino
Thermal Consolidation Of Dredge Sand For Artificial Reef Formations, Alexandro Trevino
Theses and Dissertations
Coral Reef ecosystems have degraded over years due to a variety of environmental issues such as ocean acidification. The continuous stress has detrimental effects on coral reef ecosystems that can possibly lead to the loss of the ecosystem. Our research aims to construct a prototype of an artificial reef by consolidating dredge sand from the ship channels of South Texas. Consolidation is achieved through an aluminum polytetrafluoroethylene self-propagating high temperature process that yields a solid formation to mimic the physical properties of coral reef structures. Using thermodynamic calculations, the variation of initial components was determined that reached an adiabatic temperature …
Characterization Of Coupled Gold Nanoparticles In A Sparsely Populated Square Lattice, Roy Truett French Iii
Characterization Of Coupled Gold Nanoparticles In A Sparsely Populated Square Lattice, Roy Truett French Iii
Graduate Theses and Dissertations
Metal nanoparticles deposited in regular arrays spaced at optical wavelengths support a resonance due to a coherent coupling between localized surface plasmon mode and lattice diffraction allowing for engineering of tunable devices for use in biological sensors, nanoantennae, and enhanced spectroscopy. Techniques such as electron beam lithography, focused ion beam lithography, nanosphere lithography, and nanoimprint lithography are used for fabrication but are limited by cost, device throughput, and small deposition. Polymer soft lithography and continuous dewetting of particles is a potentially viable alternative showing promise in all of those areas. This thesis developed the fabrication of a refined hydrophilic nanoimprinted …
Infrared Energy Conversion In Plasmonic Fields At Two-Dimensional Semiconductors, Gregory Thomas Forcherio
Infrared Energy Conversion In Plasmonic Fields At Two-Dimensional Semiconductors, Gregory Thomas Forcherio
Graduate Theses and Dissertations
Conversion of infrared energy within plasmonic fields at two-dimensional, semiconductive transition metal dichalcogenides (TMD) through plasmonic hot electron transport and nonlinear frequency mixing has important implications in next-generation optoelectronics. Drude-Lorentz theory and approximate discrete dipole (DDA) solutions to Maxwell’s equations guided metal nanoantenna design towards strong infrared localized surface plasmon resonance (LSPR). Excitation and damping dynamics of LSPR in heterostructures of noble metal nanoantennas and molybdenum- or tungsten-disulfide (MoS2; WS2) monolayers were examined by parallel synthesis of (i) DDA electrodynamic simulations and (ii) near-field electron energy loss (EELS) and far-field optical transmission UV-vis spectroscopic measurements. Susceptibility to second-order nonlinear frequency …
Plasmon-Mediated Energy Conversion In Metal Nanoparticle-Doped Hybrid Nanomaterials, Jeremy Dunklin
Plasmon-Mediated Energy Conversion In Metal Nanoparticle-Doped Hybrid Nanomaterials, Jeremy Dunklin
Graduate Theses and Dissertations
Climate change and population growth demand long-term solutions for clean water and energy. Plasmon-active nanomaterials offer a promising route towards improved energetics for efficient chemical separation and light harvesting schemes. Two material platforms featuring highly absorptive plasmonic gold nanoparticles (AuNPs) are advanced herein to maximize photon conversion into thermal or electronic energy. Optical extinction, attributable to diffraction-induced internal reflection, was enhanced up to 1.5-fold in three-dimensional polymer films containing AuNPs at interparticle separations approaching the resonant wavelength. Comprehensive methods developed to characterize heat dissipation following plasmonic absorption was extended beyond conventional optical and heat transfer descriptions, where good agreement was …