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Synthesis, Stabilization, And Modification Of Zinc Oxide Nanoparticles For Biological Applications, Allison Kimberly Freese 2019 Missouri State University

Synthesis, Stabilization, And Modification Of Zinc Oxide Nanoparticles For Biological Applications, Allison Kimberly Freese

MSU Graduate Theses

Nanoparticles have become very useful as delivery systems in biomedicine. The nanoparticles can be layered with different compounds to produce a vessel for transport of biological materials. Specifically, gold nanoparticles layered with a reducing agent, lysozyme, and polyelectrolytes can be synthesized to transport lysozyme into a cell. However, zinc oxide nanoparticles are cheaper, biocompatible nanoparticles that can be used for the same process. Here in, zinc oxide nanoparticle conjugates were synthesized, modified, and analyzed to be used as a biological material delivery system. The zinc oxide nanoparticles were synthesized using zinc chloride and sodium hydroxide. The particles were then layered ...


Development Of Bismuth Oxyhalide Photocatalysts For Environmental And Industrial Applications, Robert Arthur 2019 University of Maine

Development Of Bismuth Oxyhalide Photocatalysts For Environmental And Industrial Applications, Robert Arthur

Electronic Theses and Dissertations

Heterogeneous semiconductor photocatalysis, of interest for water splitting and environmental remediation applications, uses light to drive reactions. Metal oxide and sulfide semiconductors have been previously studied but have limitations that include large band gap energies and high rates of recombination. Bismuth oxyhalides (BiOX) are an emerging class of photocatalysts with tunable band gaps and low rates of recombination due to their unique crystal structures. Studies of BiOX photocatalytic activity have largely focused on removal of azo dyes from aqueous solutions, with little attention paid to degradation byproducts. Furthermore, these catalysts have not been explored as a means to conduct organic ...


Optical Memory Behavior, Metallophilic Luminescence, And Chemical Sensing Ability Of Inorganic And Organometallic Complexes: Development Of Optoelectronic Materials, Aaron D. Nicholas 2019 University of Maine

Optical Memory Behavior, Metallophilic Luminescence, And Chemical Sensing Ability Of Inorganic And Organometallic Complexes: Development Of Optoelectronic Materials, Aaron D. Nicholas

Electronic Theses and Dissertations

This dissertation is divided into three sections: (1) optical memory, (2) metallophilic-based luminescence, and (3) chemical sensors. (1) Optical memory behavior of d10metal Cu(I) thiocyanate salts are investigated to explore their potential use in the development of digital data storage devices. From this study we have discovered a new class of CuSCN(3-BrPy)2optical memory material which undergo a reduction in emission intensity upon laser irradiation. This loss of emission intensity can be reversed simply by heating the sample to room temperature. The mechanism by which this emission loss occurs has been studied, revealing a migrating ...


Luminescence Antenna Behavior In Lanthanide Complexes And Luminescence Sensing In Group 11 Iodides, Francis Barnes 2019 University of Maine

Luminescence Antenna Behavior In Lanthanide Complexes And Luminescence Sensing In Group 11 Iodides, Francis Barnes

Electronic Theses and Dissertations

In this thesis luminescent materials are studied. The luminescent materials studied are lanthanide complexes and group 11 iodide sensing abilities. Emission intensity of the lanthanide complexes through direct excitation of the lanthanide ion are relatively weak. To overcome this, three unique organic ligands were utilized to synthesize lanthanide nitrate complexes in which higher emission intensity can be observed via the antenna effect. Increased emission intensity resulted for EuIII and TbIII complexes for each ligand except triphenylphosphane oxide (only the TbIII complex demonstrated increased emission intensity). Latva’s empirical rule allows for the antenna effect to occur, in ...


Gas Chromatography Analysis Of Co2 Reduction Photocatalysis With Zinc Dipyrrin Complexes, Alex Day 2019 East Tennessee State University

Gas Chromatography Analysis Of Co2 Reduction Photocatalysis With Zinc Dipyrrin Complexes, Alex Day

Undergraduate Honors Theses

Bis(1,3,7,9-tetramethyl-5-mesityldipyrrinato)zinc(II) (ZnDPY) was synthesized in the lab by the McCusker group and a procedure was created to analyze its ability as a photosensitizer, a molecule that provides the energy for the reaction to occur by capturing light energy and turning it into a form that can be used by the photocatalyst. While more work is needed, preliminary steps have been made to create a process that can analyze the amount of carbon monoxide produced by a photocatalytic CO2 reduction reaction with ZnDPY as the photosensitizer. Progress has been made via the setup of ...


Development Of Granulated Adsorbent For Clean-Up Of Water Contaminated By Cesium, Esther Alorkpa 2019 East Tennessee State University

Development Of Granulated Adsorbent For Clean-Up Of Water Contaminated By Cesium, Esther Alorkpa

Electronic Theses and Dissertations

A study was conducted on sol-gel synthesis of an adsorbent (phosphotungstic acid embedded in silica gel, H-PTA/SiO­2) of radioactive cesium. A novelty of this work is covalent bonding of PTA to the surface of solid support that prevents leaching from the surface of the material. The sample was granulated with a binder, aluminium oxide (γ-Al2O3). Solid-state NMR and FT-IR spectroscopy were used to confirm the presence of Keggin units of PTA in the bound materials. Thermal analysis of H-PTA/SiO­2 - γ-Al2O3 (50 %) showed that the water content in the bound material ...


Preparation Of Enantioenriched Alkyltin Species And Their Application In Stereospecific Transformations, Glenn O. Ralph 2019 The Graduate Center, City University of New York

Preparation Of Enantioenriched Alkyltin Species And Their Application In Stereospecific Transformations, Glenn O. Ralph

All Dissertations, Theses, and Capstone Projects

Organometallic reagents containing the tin-carbon bond are used extensively in modern synthetic chemistry for the formation of new bonds to carbon. Over recent decades, transition metal catalyzed cross coupling reactions between two C(sp2) centers have been widely developed. However, the introduction of a C(sp3) center complicates the catalytic cycle, and opens unproductive chemical pathways which lead to isomerization, elimination, and racemization. Our lab has developed a modified-Stille reaction to combat the deleterious effects of β-hydride elimination. Our protocol enables unactivated 2° alkyl organotin nucleophiles to undergo efficient cross coupling reactions with C(sp2) electrophiles, avoiding ...


Computational Studies Of Small Molecule Activation In Catylsis And Green Chemistry, Alexa N. Griffith Ms. 2019 University of Tennessee, Knoxville

Computational Studies Of Small Molecule Activation In Catylsis And Green Chemistry, Alexa N. Griffith Ms.

Chancellor’s Honors Program Projects

No abstract provided.


An Investigation Of Alkylboron Transmetallation In Palladium-Catalyzed Suzuki Reactions, Benjamin Murray 2019 The Graduate Center, City University of New York

An Investigation Of Alkylboron Transmetallation In Palladium-Catalyzed Suzuki Reactions, Benjamin Murray

All Dissertations, Theses, and Capstone Projects

Through the past 40 years, carbon-carbon cross-coupling reactions have greatly enhanced the ability of chemists to synthesize C(sp2)-C(sp2) bonds and more recently C(sp2)-C(sp3) bonds. In particular, the Suzuki reaction has proven to be invaluable with its high yields, good functional group tolerance, and low toxicity of reagents. One of the component steps of the catalytic cycle of this reaction is transmetallation, in which the nucleophilic species transfers its organic component to the metal center (generally palladium). The mechanism of transfer from primary alkylboron nucleophiles was studied in the 1990's ...


Effect Of A Coordinating Pyridine Moiety On The Sap And Tsap Isomer Populations Of Bimodal Lanthanide (Iii) Complexes, Marisa Poveda, Osasere M. Evbuomwan 2019 The University of San Francisco

Effect Of A Coordinating Pyridine Moiety On The Sap And Tsap Isomer Populations Of Bimodal Lanthanide (Iii) Complexes, Marisa Poveda, Osasere M. Evbuomwan

Creative Activity and Research Day - CARD

Paramagnetic Chemical Exchange Saturation Transfer (PARACEST) agents are lanthanide complexes that generate contrast through the slow-to-intermediate exchange of paramagnetically-shifted protons or water molecules. Although PARACEST agents have shown promise as molecular imaging agents, in-vivostudies have been limited due to the masking of the CEST signal by spin-relaxation exchange (T2ex) and Magnetization Transfer (MT) effects. The majority of PARACEST agents studied to date have been Ln(III)DOTA-tetraamides which can either adopt the square antiprismatic (SAP) or twisted square antiprismatic (TSAP) geometries in solution. The more compact nature of the SAP isomer, combined with its slower bound-water exchange kinetics ...


Synthesis Of A Hydrophobic/Hydrophilic Nano-Patterned Metal-Organic Framework Material, Daniel Pivaral 2019 Kansas State University Libraries

Synthesis Of A Hydrophobic/Hydrophilic Nano-Patterned Metal-Organic Framework Material, Daniel Pivaral

Kansas State University Undergraduate Research Conference

Metal-Organic Framework (MOF) materials are supramolecular structures that are formed from the assembly of organic molecules that[AL1] have multiple binding sites with compatible metal cations. The resulting structure is a uniform and porous 3D grid-like with metal vertices that are connected by organic linkers. MOFs have several potential uses such as catalysis, detection, and gas storage, and new strategies to synthesize functional MOFs continue to be developed. One strategy is post synthetic modification (PSM), a process where different chemical groups are grafted onto the organic linkers via chemical reaction. The main objective of this research is to demonstrate that ...


G-Quadruplex Dynamics Contribute To Regulation Of Mitochondrial Gene Expression, M. Falabella, J. E. Kolesar, C. Wallace, D. de Jesus, L. Sun, Y. V. Taguichi, C. Wang, T. Wang, Irene M. Xiang , '18, J. K. Alder, R. Maheshan, W. Horne, Joshua R. Turek-Herman , '16, P. J. Pagano, C. M. St. Croix, N. Sondheimer, Liliya A. Yatsunyk, F. B. Johnson, B. A. Kaufman 2019 Swarthmore College

G-Quadruplex Dynamics Contribute To Regulation Of Mitochondrial Gene Expression, M. Falabella, J. E. Kolesar, C. Wallace, D. De Jesus, L. Sun, Y. V. Taguichi, C. Wang, T. Wang, Irene M. Xiang , '18, J. K. Alder, R. Maheshan, W. Horne, Joshua R. Turek-Herman , '16, P. J. Pagano, C. M. St. Croix, N. Sondheimer, Liliya A. Yatsunyk, F. B. Johnson, B. A. Kaufman

Chemistry & Biochemistry Faculty Works

Single-stranded DNA or RNA sequences rich in guanine (G) can adopt non-canonical structures known as G-quadruplexes (G4). Mitochondrial DNA (mtDNA) sequences that are predicted to form G4 are enriched on the heavy-strand and have been associated with formation of deletion breakpoints. Increasing evidence supports the ability of mtDNA to form G4 in cancer cells; however, the functional roles of G4 structures in regulating mitochondrial nucleic acid homeostasis in non-cancerous cells remain unclear. Here, we demonstrate by live cell imaging that the G4-ligand RHPS4 localizes primarily to mitochondria at low doses. We find that low doses of RHPS4 do not induce ...


Dentin Biomodification Potency Of Proanthocyanidins, David J. Ryker 2019 Taylor University

Dentin Biomodification Potency Of Proanthocyanidins, David J. Ryker

Chemistry Student Scholarship

No abstract provided.


Drug Improvement And Design Involving G-Protein Coupled Receptors, Gabriel Saliba 2019 Taylor University

Drug Improvement And Design Involving G-Protein Coupled Receptors, Gabriel Saliba

Chemistry Student Scholarship

No abstract provided.


Development Of In Situ Forming Hydrogels For Intra-Articular Drug Delivery, Andy Prince 2019 The University of Western Ontario

Development Of In Situ Forming Hydrogels For Intra-Articular Drug Delivery, Andy Prince

Electronic Thesis and Dissertation Repository

Hydrogels are 3-dimensional crosslinked polymer networks that can absorb significant amounts of water. The physical properties associated with hydrogels affords them resemblance to biological tissues making them good candidates for biomedical applications. Many pharmaceuticals, specifically non-steroidal anti-inflammatory drugs (NSAIDs), have poor aqueous solubility, which limits their bioavailability and efficacy. People suffering from chronic osteoarthritis (OA) are required to frequently take large doses to mitigate pain, which can lead to serious side effects. Hydrogels are good strategies to deliver NSAIDs via articular injection because they can form solid gels in situ. This thesis describes the synthesis, formulation, mechanical testing, in vitro ...


Modeling Of Diffusivity For 2d Vacancy Nanopits And Comparison With 2d Adatom Nanoislands On Metal(100) Surfaces Including Analysis For Ag(100), King C. Lai, Da-Jiang Liu, Patricia A. Thiel, James W. Evans 2019 Iowa State University and Ames Laboratory

Modeling Of Diffusivity For 2d Vacancy Nanopits And Comparison With 2d Adatom Nanoislands On Metal(100) Surfaces Including Analysis For Ag(100), King C. Lai, Da-Jiang Liu, Patricia A. Thiel, James W. Evans

Patricia A. Thiel

Diffusion coefficients, DN, for 2D vacancy nanopits are compared with those for 2D homoepitaxial adatom nanoislands on metal(100) surfaces, focusing on the variation of DN with size, N. Here, Nis measured in missing atoms for pits and adatoms for islands. Analysis of DN is based on kinetic Monte Carlo simulations of a tailored stochastic lattice-gas model, where pit and island diffusion are mediated by periphery diffusion, i.e., by edge atom hopping. Precise determination of DNversus N for typical parameters reveals a cyclical variation with an overall decrease in magnitude for increasing moderate ...


Palladium Complexes Bearing Κ²-N,N And Κ³-N,N,O Pendant Amine Bis(Phenolate) Ligands, Brendan J. Graziano, Eric M. Collins, Nathaniel C. McCutcheon, Claire L. Griffith, Nicole M. Braunscheidel, Trilisa M. Perrine, Bradley M. Wile 2019 Ohio Northern University

Palladium Complexes Bearing Κ²-N,N And Κ³-N,N,O Pendant Amine Bis(Phenolate) Ligands, Brendan J. Graziano, Eric M. Collins, Nathaniel C. Mccutcheon, Claire L. Griffith, Nicole M. Braunscheidel, Trilisa M. Perrine, Bradley M. Wile

Chemistry Faculty Scholarship

The synthesis and characterization of ten new palladium(II) amine bis(phenolate) complexes is reported. Solution and single-crystal X-ray diffraction studies reveal the presence of both κ2-N,N and κ3-N,N,O binding modes in these square planar complexes. For complexes with sterically less demanding phenolate donors, addition of external acidic or basic reagents allows for the selective masking of a coordination site at Pd. Complexes bearing bulky cumyl substituents on phenolate donors exhibited unusual 1H NMR spectroscopic features that are consistent with an anagostic interaction with the palladium center. Computational analysis at the ωB97X-D ...


Facial Rhenium Tricarbonyl Complexes With Modified Dii Ligands, Dominick Vitale 2019 The University of Akron

Facial Rhenium Tricarbonyl Complexes With Modified Dii Ligands, Dominick Vitale

Williams Honors College, Honors Research Projects

Over the course of this semester, promising preliminary research into a novel area of inorganic chemistry has been underway. Multiple different bis(arylimino)isoindolines (BAI), a compound made from the disubstitution of diiminoisoindoline with aryl amines to form planar tridentate ligands, were tested to determine if the structure could be forcefully bent to fit a facial binding mode. It was theorized that the bending of the usually planar chelate would cause an electronic change, destabilizing the orbitals. Different synthetic techniques were explored allowing the formation a new BAI, 1,3-bis(3-pyrazolylimino)isoindoline which was characterized via X-ray crystallography, as well ...


The Synthesis Of Ferrocene-Based Ionic Liquids, Stephen Petrochko 2019 The University of Akron

The Synthesis Of Ferrocene-Based Ionic Liquids, Stephen Petrochko

Williams Honors College, Honors Research Projects

Ionic liquids are compounds which are held together through ionic interactions, and can be classified as salts. However, while most salts have very high melting temperatures, ionic liquids are a class of compounds that can melt at very low temperatures, often at room temperatures. Ionic liquids can have optimal electronic properties for electrochemical applications, particularly for the easy transport of charges. Some new materials are being explored for the development of ionic liquids; one of these materials is ferrocene. Varying the substituents which are attached to ferrocene may produce a material that can be used as an electrolyte in energy ...


Phosgene In The Upper Troposphere And Lower Stratosphere: A Marker For Product Gas Injection Due To Chlorine-Containing Very Short Lived Substances, Jeremy J. Harrison, Martyn P. Chipperfield, Ryan Hossaini, Christopher D. Boone, Sandip Dhomse, Wuhu Feng, Peter F. Bernath 2019 Old Dominion University

Phosgene In The Upper Troposphere And Lower Stratosphere: A Marker For Product Gas Injection Due To Chlorine-Containing Very Short Lived Substances, Jeremy J. Harrison, Martyn P. Chipperfield, Ryan Hossaini, Christopher D. Boone, Sandip Dhomse, Wuhu Feng, Peter F. Bernath

Chemistry & Biochemistry Faculty Publications

Abstract: Phosgene in the atmosphere is produced via the degradation of carbon tetrachloride, methyl chloroform, and a number of chlorine‐containing very short lived substances (VSLS). These VSLS are not regulated by the Montreal Protocol even though they contribute to stratospheric ozone depletion. While observations of VSLS can quantify direct stratospheric source gas injection, observations of phosgene in the upper troposphere/lower stratosphere can be used as a marker of product gas injection of chlorine‐containing VSLS. In this work we report upper troposphere/lower stratosphere measurements of phosgene made by the ACE‐FTS (Atmospheric Chemistry Experiment Fourier Transform Spectrometer ...


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