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Articles 1 - 30 of 224
Full-Text Articles in Physical Sciences and Mathematics
Hydrothermal Synthesis Of First-Row Transition Metal Polyanions Towards The Design Of Frustrated Magnetic Materials, Megan Smart
Hydrothermal Synthesis Of First-Row Transition Metal Polyanions Towards The Design Of Frustrated Magnetic Materials, Megan Smart
All Dissertations
Novel modern materials are constantly being discovered as humanity seeks constantly better improvement to the optics and electronics around us, from lasers used in medical therapies to the magnets and supercomputing chips in our phones. Inorganic oxides commonly draw inspiration from naturally occurring minerals to template new discoveries through substitution of similarly behaving elements with the goal of inducing certain desired properties, such as ferroelectricity or creating the elusive quantum spin liquid. While many minerals are silicates, its periodic table neighbor germanium(IV) has a rich and under-explored crystal chemistry that could contain many new structures and magnetic materials. Another common …
Studies On Electrochemical Hydrogen Isotope Separation, Liyanage Mayura Sankalpa Silva
Studies On Electrochemical Hydrogen Isotope Separation, Liyanage Mayura Sankalpa Silva
All Dissertations
Graphene-integrated Proton Exchange Membrane (PEM) electrochemical cells have emerged as a novel area of scientific investigation in the realm of hydrogen isotope separation. Chemical Vapor Deposited (CVD) graphene has been especially useful due to its large-scale production capability for scaling-up purposes. The research described in this dissertation explores the role that inadvertent introduction of cations, notably ammonium and copper, during the CVD graphene transfer onto PEM substrates, such as Nafion, might play in affecting hydrogen ion transport and isotope separation in PEM electrochemical cells. An extensive review of existing literature exposed a gap concerning unintentional cation introductions during graphene transfer, …
Understanding The Interaction Of Environmental Contaminants With Polystyrene Nanoparticles And Dna Using Nuclear Magnetic Resonance Spectroscopy And Density Functional Theory, Saduni Arachchi
All Dissertations
The objective of the thesis is to study the effect of environmental pollutants on polystyrene nanoparticles and biomolecules. This is done in two different techniques, particularly NMR and density functional theory. In this thesis, we use a combination of 1H NMR, Saturation-Transfer Difference (STD) NMR and relaxation experiments to study the interactions, kinetics and dynamics of antibiotics with polystyrene nanoparticles. (PS NPs) Density functional theory (DFT) is used to study the binding of commonly used non-oxidative hair dyes to biomolecules (DNA and amino acids) and PS particles.
Computationally-Driven Insights Into The Ligand Environments Of Materials For Catalysis And Separations, Stephen Vicchio
Computationally-Driven Insights Into The Ligand Environments Of Materials For Catalysis And Separations, Stephen Vicchio
All Dissertations
Designing new catalytic and sorption materials is necessary to limit global temperature rise below 1.5 ◦C by 2050, while also meeting global energy demands. Climate change and energy production are not mutually exclusive; global population growth has direct impacts on global energy demands and climate. In both catalysis and adsorption applications, new technologies are needed to address these challenges. Catalysis can provide alternate, low-energy routes for converting low-value gases into higher-value chemical commodities, thus altering our current energy production. Likewise, new sorption materials can capture previously emitted CO2 from decades of energy production from fossil fuels, thus helping to …
Aspects Of Stochastic Geometric Mechanics In Molecular Biophysics, David Frost
Aspects Of Stochastic Geometric Mechanics In Molecular Biophysics, David Frost
All Dissertations
In confocal single-molecule FRET experiments, the joint distribution of FRET efficiency and donor lifetime distribution can reveal underlying molecular conformational dynamics via deviation from their theoretical Forster relationship. This shift is referred to as a dynamic shift. In this study, we investigate the influence of the free energy landscape in protein conformational dynamics on the dynamic shift by simulation of the associated continuum reaction coordinate Langevin dynamics, yielding a deeper understanding of the dynamic and structural information in the joint FRET efficiency and donor lifetime distribution. We develop novel Langevin models for the dye linker dynamics, including rotational dynamics, based …
Expansion Of The Diazacyclobutene Motif For Antiparasitic Evaluation, Brock Alexander Miller
Expansion Of The Diazacyclobutene Motif For Antiparasitic Evaluation, Brock Alexander Miller
All Dissertations
Molecules containing N-heterocycles are prevalent in pharmaceutical settings. The ability to generate highly functionalized molecules containing N-heterocycles in very few synthetic operations is valuable for drug discovery. Our group has developed a two-step synthesis to access a rarely studied diazacyclobutene scaffold via a formal [2+2] cycloaddition between 4-phenyl-1,2,4-triazolinedione and electron-rich thioalkynes. Our interest in this scaffold increased exponentially from promising preliminary biological evaluations against a protozoan parasite, Trypanosoma brucei. While we were able to double the number of historical examples of this scaffold, there were significant limitations in our methodology. The most notable limitations were the lack …
Atom Economical Reactions Of Terpenoids And Post-Consumer Plastics With Sulfur, Charini Maladeniya
Atom Economical Reactions Of Terpenoids And Post-Consumer Plastics With Sulfur, Charini Maladeniya
All Dissertations
The production of Ordinary Portland Cement (OPC) and its uses have a complicated environmental impact, which is influenced by infrastructure development and building operations as well as CO2 emissions, which account for 7% of all worldwide CO2 emissions. Due to the increasing population, production is still ongoing. The search for cement and construction materials produced with zero to low CO2 emissions is therefore continuous. Finding recyclable, CO2 gas-free biocomposites with high sulfur content that can rival the mechanical properties of popular building supplies like Portland cement is the primary objective of the research discussed in this …
Composite And Polymer Formulation Employing Sulfur And Bio-Olefin Feedstocks, Claudia V. Lopez
Composite And Polymer Formulation Employing Sulfur And Bio-Olefin Feedstocks, Claudia V. Lopez
All Dissertations
Environmental sustainability represents a challenge for society since industrial growth has a direct impact on natural resources and waste production. New technologies that effectively incorporate waste into renewable resources are critical to the development of a sustainable and circular economy. The manufacturing of structural materials like Portland cement (OPC) is responsible for >8% of the global anthropogenic emissions of carbon dioxide, with ~ 1 kg of CO2 released to the atmosphere for every kilogram of OPC produced. For instance, the development of sustainable structural materials is a key factor to reduce the greenhouse emissions and to attenuate the climate …
Characterization Of Mechanically Recycled Polylactic Acid (Pla) Filament For 3d-Printing By Evaluating Mechanical, Thermal, And Chemical Properties And Process Performance, Mahsa Shabani Samghabady
Characterization Of Mechanically Recycled Polylactic Acid (Pla) Filament For 3d-Printing By Evaluating Mechanical, Thermal, And Chemical Properties And Process Performance, Mahsa Shabani Samghabady
All Theses
Polylactic acid (PLA) is a biopolymer made from renewable resources such as sugar and corn. PLA filament is a popular material used in Fused Deposition Modeling (FDM) 3D-printing. While this material has many advantages, all the failed parts, support structures, rafts, nozzle tests, and the many prototype iterations during the 3D-printing process contribute to the plastic pollution and release of greenhouse gases. Although PLA is biodegradable, it can take years to degrade in landfills. Instead of throwing away PLA waste and buying new filaments, PLA can be recycled. Amongst the different recycling technologies, mechanical recycling is the most environmentally friendly. …
Electron-Transfer Mediated Photo-Switching In Nanoparticles, Liaoran Cao
Electron-Transfer Mediated Photo-Switching In Nanoparticles, Liaoran Cao
All Dissertations
Previous publications from our lab demonstrated viable approaches to design a photo-switching nanoparticle with arguably superior brightness and photostability resulting in an improved resolution in localization-based microscopy, as compared to other photo-switching dyes or particles. As a follow-up, this dissertation is focused on two major tasks: first, developing nanoparticles with better photo-switching properties for super-resolution imaging; second, trying to achieve a better physical picture of the mechanisms involved in photo-switching, including polaron dynamics, charge transfer, and energy transfer. A new class of photo-switchable nanoparticles was developed by blending conjugated polymer semiconductor with fullerene-based electron acceptors, and further blending with polystyrene …
The Influence Of Allostery Governing The Changes In Protein Dynamics Upon Substitution, Joseph Hess
The Influence Of Allostery Governing The Changes In Protein Dynamics Upon Substitution, Joseph Hess
All Dissertations
The focus of this research is to investigate the effects of allostery on the function/activity of an enzyme, human immunodeficiency virus type 1 (HIV-1) protease, using well-defined statistical analyses of the dynamic changes of the protein and variants with unique single point substitutions 1. The experimental data1 evaluated here only characterized HIV-1 protease with one of its potential target substrates. Probing the dynamic interactions of the residues of an enzyme and its variants can offer insight of the developmental importance for allosteric signaling and their connection to a protein’s function. The realignment of the secondary structure elements can …
Effects Of Low-Energy X-Rays And Uv Radiation On Fibroblast Cells, Michelle Gorodisky, Congyue Peng, Arianna Csiszer, Delphine Dean
Effects Of Low-Energy X-Rays And Uv Radiation On Fibroblast Cells, Michelle Gorodisky, Congyue Peng, Arianna Csiszer, Delphine Dean
Chemistry Summer Research Program
No abstract provided.
Using Alginate Beads Modified With Graphite As An Effective Electrode, Madeline Mchugh, Barbara G. S. Guinati, Carlos D. Garcia
Using Alginate Beads Modified With Graphite As An Effective Electrode, Madeline Mchugh, Barbara G. S. Guinati, Carlos D. Garcia
Chemistry Summer Research Program
No abstract provided.
Isolation Of Bovine Milk-Derived Exosomes Via A Polyester Capillary- Channeled Polymer (C-Cp) Fiber Stationary Phase, Jerisa Pimentel, Carolina Mata, R. Kenneth Marcus
Isolation Of Bovine Milk-Derived Exosomes Via A Polyester Capillary- Channeled Polymer (C-Cp) Fiber Stationary Phase, Jerisa Pimentel, Carolina Mata, R. Kenneth Marcus
Chemistry Summer Research Program
No abstract provided.
Investigation Of Vitamin D Metabolites Using Different Ion Mobility-Mass Spectrometry (Im-Ms) Methods, Selena Kingsley, Christopher D. Chouinard
Investigation Of Vitamin D Metabolites Using Different Ion Mobility-Mass Spectrometry (Im-Ms) Methods, Selena Kingsley, Christopher D. Chouinard
Chemistry Summer Research Program
No abstract provided.
Dynamics Of Ionizable Polymers In Ionic Liquid (Il) Using Nuclear Magnetic Resonance Spectroscopy, Sophie Ntipouna, Hayden Sasko, Shalika D. K. Meedin, Dvora Perahia
Dynamics Of Ionizable Polymers In Ionic Liquid (Il) Using Nuclear Magnetic Resonance Spectroscopy, Sophie Ntipouna, Hayden Sasko, Shalika D. K. Meedin, Dvora Perahia
Chemistry Summer Research Program
No abstract provided.
Development Of A Rapid Sars-Cov-2 Nucleocapsid Assay Using Buoyant And Magnetic (Bam) Beads, Spasenija Radenovic, Zahra Karimpourkalou, Chaunlei Wang, Jeffrey N. Anker
Development Of A Rapid Sars-Cov-2 Nucleocapsid Assay Using Buoyant And Magnetic (Bam) Beads, Spasenija Radenovic, Zahra Karimpourkalou, Chaunlei Wang, Jeffrey N. Anker
Chemistry Summer Research Program
No abstract provided.
Accessing Rare Heterocycles From Alkynyl Ethers And Nitrogenous Electrophiles & The Development Of Small Molecule Inhibitors Against Naegleria Fowleri Infection, James W. D. Morris, Samuel Kwain, Daniel C. Whitehead
Accessing Rare Heterocycles From Alkynyl Ethers And Nitrogenous Electrophiles & The Development Of Small Molecule Inhibitors Against Naegleria Fowleri Infection, James W. D. Morris, Samuel Kwain, Daniel C. Whitehead
Chemistry Summer Research Program
No abstract provided.
Measurement Of Protein And Drug Adsorption On Nanoparticles By Competition With Dyes, Ashleigh Carroll, Jason Mcneill
Measurement Of Protein And Drug Adsorption On Nanoparticles By Competition With Dyes, Ashleigh Carroll, Jason Mcneill
Chemistry Summer Research Program
No abstract provided.
Supramolecular Π-Donor/Acceptor Arrays Based On Metal-Organic Cage Inclusion Complexes, Sean Hannigan, Evan Thibodeaux, Sourav Saha
Supramolecular Π-Donor/Acceptor Arrays Based On Metal-Organic Cage Inclusion Complexes, Sean Hannigan, Evan Thibodeaux, Sourav Saha
Chemistry Summer Research Program
No abstract provided.
Nuclear Magnetic Resonance Studies Of Potential Environmental Contaminants Interacting With Dna, Anna Hopkins, Leah B. Casabianca
Nuclear Magnetic Resonance Studies Of Potential Environmental Contaminants Interacting With Dna, Anna Hopkins, Leah B. Casabianca
Chemistry Summer Research Program
No abstract provided.
Big Data For A Deep Problem: Exploring Natural Deep Eutectic Solvent (Nades) Properties Through Rdkit And Data Analytics, Grayson Weavil, Lucas B. Ayres, Carlos D. Garcia
Big Data For A Deep Problem: Exploring Natural Deep Eutectic Solvent (Nades) Properties Through Rdkit And Data Analytics, Grayson Weavil, Lucas B. Ayres, Carlos D. Garcia
Chemistry Summer Research Program
No abstract provided.
The Dynamic Shift To Green Chemistry: Investigating The Spectral Behavior Of Natural Deep Eutectic Solvents (Nades) And Their Performance As Maldi-Tof Matrices, Grayson Weavil, Lucas B. Ayres, Miguel Jose-Bueno, Rakesh Sachdeva, Carlos D. Garcia
The Dynamic Shift To Green Chemistry: Investigating The Spectral Behavior Of Natural Deep Eutectic Solvents (Nades) And Their Performance As Maldi-Tof Matrices, Grayson Weavil, Lucas B. Ayres, Miguel Jose-Bueno, Rakesh Sachdeva, Carlos D. Garcia
Chemistry Summer Research Program
No abstract provided.
Tuning Oxo Formation Energies Using Spectator Ligands In The Mil-100 Metal Organic Framework, Victoria E. Lee, Stephen P. Vicchio, Rachel B. Getman
Tuning Oxo Formation Energies Using Spectator Ligands In The Mil-100 Metal Organic Framework, Victoria E. Lee, Stephen P. Vicchio, Rachel B. Getman
Chemistry Summer Research Program
No abstract provided.
Investigation Of Vitamin D Metabolites Using Different Ion Mobility-Mass Spectrometry (Im-Ms) Methods, Selena Kingsley, Christopher D. Chouinard
Investigation Of Vitamin D Metabolites Using Different Ion Mobility-Mass Spectrometry (Im-Ms) Methods, Selena Kingsley, Christopher D. Chouinard
Chemistry Summer Research Program
No abstract provided.
Stimuli-Responsive Self-Folding Bilayer Polymer Thin Films, Astrid Garcia, Dimuthu Edirisinghe, Bogdan Oliy, George Chumanov
Stimuli-Responsive Self-Folding Bilayer Polymer Thin Films, Astrid Garcia, Dimuthu Edirisinghe, Bogdan Oliy, George Chumanov
Chemistry Summer Research Program
No abstract provided.
Multi-Catalysis: Trifluoromethylation Of Amides, Ethan Apsley, Jason Wilt, Giovani Gutierrez, Byoungmoo Kim
Multi-Catalysis: Trifluoromethylation Of Amides, Ethan Apsley, Jason Wilt, Giovani Gutierrez, Byoungmoo Kim
Chemistry Summer Research Program
No abstract provided.
Halogen Bonding In Nitrogen And Iodine Compounds To Form Novel Cocrystals, Dahlia Griffin, Ann Jiang, Colin D. Mcmillen, William T. Pennington
Halogen Bonding In Nitrogen And Iodine Compounds To Form Novel Cocrystals, Dahlia Griffin, Ann Jiang, Colin D. Mcmillen, William T. Pennington
Chemistry Summer Research Program
No abstract provided.
Cryogrinding And Physical Analysis Of A Thermoplastic Polyurethane Elastomer, Timothy E. Whitesell, Marcia Reeves, David L. Helm, Joseph S. Thrasher
Cryogrinding And Physical Analysis Of A Thermoplastic Polyurethane Elastomer, Timothy E. Whitesell, Marcia Reeves, David L. Helm, Joseph S. Thrasher
Chemistry Summer Research Program
No abstract provided.
Polymersomes As Chemotherapeutic Agents For Non-Invasive Treatment Of Glioblastoma, Tj Fletcher, Molli Garifo, Jessica Larsen, Jessica Larsen
Polymersomes As Chemotherapeutic Agents For Non-Invasive Treatment Of Glioblastoma, Tj Fletcher, Molli Garifo, Jessica Larsen, Jessica Larsen
Chemistry Summer Research Program
No abstract provided.