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Articles 1 - 7 of 7
Full-Text Articles in Physical Sciences and Mathematics
Understanding Nanoparticle-Cell Interaction, Ran Chen
Understanding Nanoparticle-Cell Interaction, Ran Chen
All Dissertations
Nanotechnology has revolutionalized the landscape of modern science and technology, including materials, electronics, therapeutics, bioimaging, sensing, and the environment. Along with these technological advancements, there arises a concern that engineered nanomaterials, owing to their high surface area and high reactivity, may exert adverse effects upon discharge to compromise biological and ecological systems. Research in the past decade has examined the fate of nanomaterials in vitro and in vivo, as well as the interactions between nanoparticles and biological and ecosystems using primarily toxicological and ecotoxicological approaches. However, due to the versatility in the physical and physicochemical properties of nanoparticles, and due …
Ultraluminous X-Ray Sources In Andromeda Galaxy: Two Recent Discoveries And Their Implications, Amanpreet Kaur
Ultraluminous X-Ray Sources In Andromeda Galaxy: Two Recent Discoveries And Their Implications, Amanpreet Kaur
All Theses
Ultraluminous X-ray sources are believed to be associated with X-ray binaries, in which an accreting black hole generates X-ray luminosities in excess of 10 39 erg/s. The nature of the companion star and the underlying physics of the accretion process is not yet established with certainty. In particular, whether or not the accretion is super/sub Eddington is an open question, as is the mass of the companion star. We discuss the first two ULXs recently discovered in M31 and investigate the nature of their underlying sources. We present the X-ray observations for ULX-1 in detail and discuss its implications for …
Spectroscopic Signature For Bundling, Edge States And Impurities In 1d And 0d Materials, Kiran Kumar Lingam
Spectroscopic Signature For Bundling, Edge States And Impurities In 1d And 0d Materials, Kiran Kumar Lingam
All Dissertations
Study of nanomaterials has gained interest of researchers from various fields of science and technology due to their unique electronic and vibrational properties as compared to their bulk counterparts. In particular, carbon nanotechnology has evolved rapidly over the past few decades and nowadays, carbon nanotubes are used in various fields such as energy storage, electronics etc. However, the quest for new properties of this material is never ending and the invention of graphene generated enormous interest in the scientific community due to its excellent properties such as strength, high electron mobility, thermal conductivity etc. In this thesis, I aim at …
Thermoelectric Properties Of Silicon Germanium: An In-Depth Study To The Reduction Of Lattice Thermal Conductivity, Daniel Thompson
Thermoelectric Properties Of Silicon Germanium: An In-Depth Study To The Reduction Of Lattice Thermal Conductivity, Daniel Thompson
All Dissertations
Thermoelectric materials provide a solid state route for the direct conversion between thermal and electrical energy. Hence, thermal gradients can be used to generate power of up to several KW, or driven DC power can be used to pump heat in or out of a system. Recent pushes in thermoelectric research are for power generation materials with higher efficiency. These materials can be used to recover energy from the waste heat of vehicles' exhaust systems, and as power generators for extraterrestrial exploration when coupled with a radioactive heat source.
The goal of this dissertation will be to demonstrate a new …
Probing And Controlling Fluid Rheology At Microscale With Magnetic Nanorods, Alexander Tokarev
Probing And Controlling Fluid Rheology At Microscale With Magnetic Nanorods, Alexander Tokarev
All Dissertations
This Dissertation is focused on the development of new methods for characterization and control of fluid rheology using magnetic nanorods. This Dissertation consists of five chapters. In the first chapter, we review current microrheologial methods and develop a Magnetic Rotational Spectroscopy (MRS) model describing nanorod response to a rotating magnetic field. Using numerical modeling, we analyze the effects of materials parameters of nanorods and fluids on the MRS characteristic features. The model is designed for a specific experimental protocol. We introduce and examine physical parameters which can be measured experimentally. The model allows identification of MRS features enabling the calculation …
Intense And Highly Energetic Atmospheric Pressure Plasma Jet Arrays, John Furmanski
Intense And Highly Energetic Atmospheric Pressure Plasma Jet Arrays, John Furmanski
All Theses
This thesis documents the efforts taken to produce highly ionized and concentrated atmospheric pressure plasma using an arrayed atmospheric pressure plasma jet (APPJ) system. The honeycomb-shaped array features seven plasma jets operating in close enough proximity to one another to exhibit jet-to-jet coupling behavior. Optimal gas flow rates for the system were determined and intense plasma plumes composed of argon and/or helium are generated. Optical emission spectroscopy was employed to observe the charged particles responsible for the emissions of each gas discharge and APPJ operation mode. Plasma etching of indium tin oxide glass was conducted to verify the highly energetic …
Highly Charged Ion Interactions With Ultrathin Dielectric Films, Russell Lake
Highly Charged Ion Interactions With Ultrathin Dielectric Films, Russell Lake
All Dissertations
The excitations occurring at a solid surface due to slow highly charged ion (HCI) impacts are interesting from the perspective of fundamental processes in atomic collisions and materials science. This thesis focuses on two questions: 1) How much HCI potential energy deposition is required to form permanent surface modifications?, 2) How does the presence of a thin dielectric surface film change the classical over-the-barrier picture for neutralization above a clean metal?
I describe a measurement of craters in thin dielectric films formed by XeQ+ (26 ≤ Q ≤ 44) projectiles. Tunnel junction devices with ion-irradiated barriers were used to amplify …