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Articles 1 - 7 of 7
Full-Text Articles in Physical Sciences and Mathematics
Synthesis Of N-Heterocyclic Carbene Complexes Of Coinage Metals And Their Application In The Activation Of Hydrogen, Maryam Akramova
Synthesis Of N-Heterocyclic Carbene Complexes Of Coinage Metals And Their Application In The Activation Of Hydrogen, Maryam Akramova
Honors Projects
The main cause of the ongoing global climate crisis is the emission of greenhouse gases, and current climate reports emphasize the need to transition to low-emission renewable energy sources. Urgently needed are methods for storing renewable energy, such as synthetic fuels like hydrogen (H2) gas; however, a challenge to the widespread implementation of hydrogen fuel is its low volumetric energy density. This thesis describes an effort to synthesize a catalyst that takes advantage of hard-soft acid-base (HSAB) mismatches to activate H2 and facilitate its reaction with CO2 to form hydrocarbon fuels, thereby providing a sustainable means …
Activation Of Hydrogen By Sterically Modulated Coinage Metal Catalysts Via Mutual Quenching Of Hard/Soft Acid/Base Mismatches, Zach Leibowitz
Activation Of Hydrogen By Sterically Modulated Coinage Metal Catalysts Via Mutual Quenching Of Hard/Soft Acid/Base Mismatches, Zach Leibowitz
Honors Projects
To mitigate the devastating environmental impacts of climate change in the coming decades, it is imperative that we replace the use of fossil fuels with renewable energy sources such as wind, solar, and hydroelectric. As these renewable energy sources are inherently intermittent, there exists a need for sustainable mechanisms to store renewable energy for later use. While the direct use of dihydrogen (H2) as a combustible fuel would allow for energy storage without the harmful release of carbon dioxide (CO2) upon combustion, the practicality of H2 as a synthetic fuel is limited by its low …
The Photocatalytic Degradation Of Ibuprofen And Atenolol Using Bismuth Oxychloride And Titanium Dioxide, Kamyron Anthony Speller
The Photocatalytic Degradation Of Ibuprofen And Atenolol Using Bismuth Oxychloride And Titanium Dioxide, Kamyron Anthony Speller
Honors Projects
Pharmaceuticals and personal care products (PPCPs) are contaminating natural bodies of water and are problematic for aquatic organisms and ecosystems. Generally, PPCPs are introduced to water systems due to incomplete removal by wastewater treatment plants (WWTPs). As such, it is vital to find ways to remediate these problematic contaminants before they are discharged into the environment. In this study, two photocatalysts¾titanium dioxide (TiO2) and bismuth oxychloride (BiOCl)¾were compared to determine their relative efficiencies (degradation rates) and dominant degradation mechanism (hydroxyl radical production or direct oxidation) with the goal of photocatalytically degrading two pharmaceuticals, atenolol and ibuprofen, using UV …
Solvent Effect On Excited State Proton Transfer Mechanism Of 8-Amino-2-Naphthol, Gabrielle Vandendries
Solvent Effect On Excited State Proton Transfer Mechanism Of 8-Amino-2-Naphthol, Gabrielle Vandendries
Honors Projects
Photoacids, compounds that undergo excited state proton transfer (ESPT), have been utilized in different solar energy and lithographic applications.1, 2 The addition of functional groups and solvent can both change the ESPT mechanism of photoacids. In this study, the effect of solvent on the ESPT mechanism was explored using a model diprotic photoacid, 8-amino-2-naphthol (8N2OH). The photochemistry of 8N2OH in water and common nonaqueous solvents, acetonitrile, tetrahydrofuran (THF), and methanol, were studied using UV/Vis absorption, steady-state emission, and time-correlated single photon counting (TCPSC) emission spectroscopy. The results were analyzed using the Kamlet-Taft parameters. It was found that the ESPT mechanism …
N,N’-Dimethyimidazolium-2-Carboxylate As A Ligand Precursor For The Accession Of A Constrained Olefin Dimerization Catalyst, Michael Harris
N,N’-Dimethyimidazolium-2-Carboxylate As A Ligand Precursor For The Accession Of A Constrained Olefin Dimerization Catalyst, Michael Harris
Honors Projects
A significant market share of modern plastics is held by long-chain hydrocarbon polymers, such as polyethylene and polypropylene, properties of which can be dramatically changed by addition of linear α-olefins. Production of linear α-olefins involves the creation of many unwanted byproducts, representing significant quantities of both economic and ecological waste. While catalysts have been designed to selectively produce industrially useful olefins, these catalysts often encounter challenges such as synthesis of other unwanted byproducts, slow reaction times, and difficulty of synthesis. Based on one such prior catalyst, we report here synthetic work towards a cobalt catalyst with a constrained N-heterocyclic carbene …
Characterization Of O-Linked Glycosylated Neuropeptides In The American Lobster (Homarus Americanus): The Use Of Peptide Labeling Following Beta Elimination, Edward Myron Bull
Characterization Of O-Linked Glycosylated Neuropeptides In The American Lobster (Homarus Americanus): The Use Of Peptide Labeling Following Beta Elimination, Edward Myron Bull
Honors Projects
Neuropeptides are a class of small peptides that govern various neurological functions, and the American lobster (Homarus americanus) provides a model system for their characterization. Neuropeptides are commonly post-translationally modified (PTM), and one common PTM is glycosylation. Past research in the Stemmler lab has found glycosylated neuropeptides in H. americanus; however, the extent and biological role of this modification has not been well characterized. This study was undertaken to determine the number of glycosylated peptides in the sinus glands of H. americanus and to develop an approach to tag the site of glycosylation using beta-elimination chemistry. LC-MS …
Benchmarking Ab Initio Computational Methods For The Quantitative Prediction Of Sunlight-Driven Pollutant Degradation In Aquatic Environments, Kasidet Trerayapiwat
Benchmarking Ab Initio Computational Methods For The Quantitative Prediction Of Sunlight-Driven Pollutant Degradation In Aquatic Environments, Kasidet Trerayapiwat
Honors Projects
Understanding the changes in molecular electronic structure following the absorption of light is a fundamental challenge for the goal of predicting photochemical rates and mechanisms. Proposed here is a systematic benchmarking method to evaluate accuracy of a model to quantitatively predict photo-degradation of small organic molecules in aquatic environments. An overview of underlying com- putational theories relevant to understanding sunlight-driven electronic processes in organic pollutants is presented. To evaluate the optimum size of solvent sphere, molecular Dynamics and Time Dependent Density Functional Theory (MD-TD-DFT) calculations of an aniline molecule in di↵erent numbers of water molecules using CAM-B3LYP functional yielded excited …