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Full-Text Articles in Physical Sciences and Mathematics
Perfluoroalkyl (Aryl) Sulfonimide Zwitterions, Hua Mei
Perfluoroalkyl (Aryl) Sulfonimide Zwitterions, Hua Mei
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This research focuses on superacid perfluoroalkyl(aryl) sulfonimides and their derivatives as a source of stable zwitterionic salts. The strong resonance stabilization of sulfonimides imparts unexpected stability to the zwitterions.
Two types of zwitterions were investigated. The first are symmetrical diaryliodonium zwitterions (DZs) as potential photo acid generators (PAGs) for microlithography. Driven by the demand for smaller feature sizes in the microelectronics industry, microlithography using shorter wavelength light has evolved and new PAGs are of interest. New DZs are potentially useful because they have good thermal stability and may be structurally modified to alter their spectral absorption characteristics. As an extension …
Characterization Of Capillary-Channeled Polymer Fibers As Stationary Phases For High-Performance Liquid Chromatography Of Macromolecules, Dwella Nelson
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Capillary-channeled polymer (C-CP) fibers are being developed and characterized as high-performance liquid chromatography (HPLC) stationary phases for reversed-phase separations of proteins. Conventional porous phases are not well suited for separating large macromolecules due to the slow diffusivity of the molecules, large diffusional distances, and stagnant mobile phase zones within the column. Stationary phases are continually being developed to address the challenges associated with HPLC of proteins and other macromolecules in general. C-CP fiber stationary phases are an alternative to conventional bead technology and offer a variety of chemical and physical advantages. The fibers can be selected for their chemical functionality …
Path Integral Formulation Of Langeinv Dynamics With Applications To Rare-Event Systems, Bradley Dickson
Path Integral Formulation Of Langeinv Dynamics With Applications To Rare-Event Systems, Bradley Dickson
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In the last decade great efforts have been made to efficiently study the behaviors of rare-event systems. The methods and theories developed in pursuit of this goal are far from unified and are instead applied on a case-by-case basis where one makes a best educated guess as to which approach may afford the greatest chance of studying the rare-event system in question. The work contained here is directed at further development of one of these sets of methods and theories. Specifically, a new theory of dynamics in the Langevin path space is developed with emphasis on generating and sampling Langevin …
The Interaction Between Hydrogen And Various Carbon Allotropes Calculated Using Bond-Order Potentials, Michael Knippenberg
The Interaction Between Hydrogen And Various Carbon Allotropes Calculated Using Bond-Order Potentials, Michael Knippenberg
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Carbon-based materials are an exciting component of materials science. The understanding of interactions at the atomic level provide useful information for creating materials with specific properties. This dissertation examines three hydrocarbon systems: amorphous carbon (with and without hydrogenation), hydrogen adsorption in carbon nanotubes, and reconstructions of the diamond surface.
A melting/quenching procedure is used to produce amorphous carbon films at 2.0, 2.6, and 3.0 g/cm3. The sp3 fraction at each density is calculated and found to be qualitatively similar to experimental data at low densities. The inclusion of hydrogen in the amorphous film causes the sp3 …