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Full-Text Articles in Arts and Humanities
Applications Of Molecular Dynamics Techniques And Spectroscopic Theories To Aqueous Interfaces, Anthony Green
Applications Of Molecular Dynamics Techniques And Spectroscopic Theories To Aqueous Interfaces, Anthony Green
USF Tampa Graduate Theses and Dissertations
The primary goal of spectroscopy is to obtain molecularly detailed information about the system under study. Sum frequency generation (SFG) vibrational spectroscopy is a nonlinear optical technique that is highly interface specific, and is therefore a powerful tool for understanding interfacial structure and dynamics. SFG is a second order, electronically nonresonant, polarization experiment and is consequently dipole forbidden in isotropic media such as a bulk liquid. Interfaces, however, serve to break the symmetry and produce a signal. Theoretical approximations to vibrational spectra of O-H stretching at aqueous interfaces are constructed using time correlation function (TCF) and instantaneous normal mode (INM) …
Effect Of Catalyst Preparation Conditions On The Performance Of Eggshell Cobalt/Sio2 Catalysts For Fischer-Tropsch Synthesis, Syed Ali Z. H Gardezi
Effect Of Catalyst Preparation Conditions On The Performance Of Eggshell Cobalt/Sio2 Catalysts For Fischer-Tropsch Synthesis, Syed Ali Z. H Gardezi
USF Tampa Graduate Theses and Dissertations
A highly selective eggshell Fischer-Tropsch catalyst has been fabricated via interaction of hydrophobic and hydrophilic molecules on thermally treated silica gel. The physical interactions of the mesoporous silica support and the effect of catalyst preparation conditions on the performance of the cobalt/SiO2 were explored. It was found that dispersion and performance of the FT cobalt/SiO2 catalyst were significantly affected by the preparation technique used. In this study we focus on two key variables: the solvent used during the precursor loading and the calcination atmosphere. Silanol groups on the silica surface and near-surface regions can alter morphology and dispersion …
Measurement Of Community And Laboratory-Generated Airborne Particulates Using A New Sampling Method, Laura Farina
Measurement Of Community And Laboratory-Generated Airborne Particulates Using A New Sampling Method, Laura Farina
USF Tampa Graduate Theses and Dissertations
This project resulted from an alleged dust problem affecting the residents in a Florida community. The residents claimed that there were elevated dust levels caused by a rock quarry adjacent to their homes. The purpose of this work was to assess total particulate, respirable particulate, and the coarse content of the sampled particles through traditional NIOSH methods, and using a new, real-time instrument known as the EPAM 5000. Data from the EPAM and NIOSH methods were compared to the EPA's particulate matter standards and the OSHA permissible exposure limits for total and respirable dust. Dust levels using the NIOSH methods …
Surface-Bonded Sol-Gel Sorbents For On-Line Hyphenation Of Capillary Microextraction With High-Performance Liquid Chromatography, Scott S. Segro
Surface-Bonded Sol-Gel Sorbents For On-Line Hyphenation Of Capillary Microextraction With High-Performance Liquid Chromatography, Scott S. Segro
USF Tampa Graduate Theses and Dissertations
High-performance liquid chromatography (HPLC) is the most widely used analysis technique. However, its sensitivity is limited. Sample preconcentration methods, such as fiber-based solid-phase microextraction (SPME) and in-tube SPME (capillary microextraction) offer improved detection limits. It is, however, difficult to couple fiber SPME on-line with HPLC due to the need for complicated desorption devices. Such coupling is further complicated due to the limited solvent stability of the extracting phase both in the fiber and in-tube formats of SPME. In this research, surface-bonded sol-gel sorbents were developed to provide the solvent stability required for effective on-line hyphenation of capillary microextraction (CME) with …