Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Chemistry

Institution
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 2881 - 2910 of 33373

Full-Text Articles in Entire DC Network

Visible Light Photocatalysis With Quantum Dot Gel For Organic Synthesis, Daohua Liu Jan 2024

Visible Light Photocatalysis With Quantum Dot Gel For Organic Synthesis, Daohua Liu

Wayne State University Dissertations

This dissertation presents metal chalcogenide quantum dots (QDs), a group of emerging visible light photocatalysts, for unique organic chemical transformations that are impossible using conventional molecular photocatalysts. The first part of this dissertation focuses on the comparison between ligand-capped CdS QD and CdS gel. CdS QD gel is a three-dimensional network of interconnected QD. CdS gels were found to show more facile charge transfer with substrates than QDs, due to the partial removal of ligands from its surface during gelation. Our study showed that the photocatalytic activity of CdS gels was indeed superior to trioctylphosphine (TOP)- and thioglycolic acid (TGA)-capped …

Go to article

Nanoscale Studies Of Magnesium Carbonate Precipitation At Ambient Conditions, Ian Shortt Jan 2024

Nanoscale Studies Of Magnesium Carbonate Precipitation At Ambient Conditions, Ian Shortt

Material Science and Engineering Dissertations - Archive

Currently approximately 8% of global greenhouse gas emissions can be attributed to the construction industry; of these emissions, a little over half of these emissions are due to the production of traditional calcium-based cements. Magnesium carbonate cements present a promising alternative to traditional calcium-based cements, both in terms of emission reductions and in terms of strength. The primary drawback to magnesium carbonate cements is that ambient curing is not yet viable. The objective of this dissertation is to therefore develop greater understanding of the precipitation pathways undertaken by hydrated magnesium carbonates under near-ambient conditions. In the first section of this …

Go to article

Chemoselective Reduction Of Dicarboxylic Acids Via Iridium Catalyzed Hydrosilylation, Linda Lallawmsangi Jan 2024

Chemoselective Reduction Of Dicarboxylic Acids Via Iridium Catalyzed Hydrosilylation, Linda Lallawmsangi

Chemistry & Biochemistry Theses - Archive

Reduction of esters to aldehydes poses a challenge since the resulting aldehydes are often more reactive than the initial esters toward nucleophilic hydride-reducing agents. Although bulky, more controllable reducing agents such as lithium tri-tert-butoxyaluminum hydride or diisobutylaluminum hydride (DIBAL-H) have been developed, they are hazardous, sensitive to moisture and air, needing strict reaction conditions, and unsuitable with a wide range of functional groups. We present the design of an iridium-catalyzed chemoselective hydrosilylation method for dicarboxylic imides, followed by hydrolysis to eliminate the amide and yield aldehydes. This approach offers versatility in general reduction chemistry, holds promise for application …

Go to article

Quantum Interference Enhancement Of The Spin-Dependent Thermoelectric Response, Runa X. Bennett, Joshua R. Hendrickson, Justin P. Bergfield Jan 2024

Quantum Interference Enhancement Of The Spin-Dependent Thermoelectric Response, Runa X. Bennett, Joshua R. Hendrickson, Justin P. Bergfield

Faculty publications – Physics

We investigate the influence of quantum interference (QI) and broken spin-symmetry on the thermoelectric response of node-possessing junctions, finding a dramatic enhancement of the spin-thermopower (Ss), figure-of-merit (ZsT), and maximum thermodynamic efficiency (ηsmax) caused by destructive QI. Using many-body and single-particle methods, we calculate the response of 1,3-benzenedithiol and cross-conjugated molecule-based junctions subject to an applied magnetic field, finding nearly universal behavior over a range of junction parameters with Ss, ZsT, and reaching peak values of 2𝜋/ √3(𝑘/𝑒)2𝜋/3(𝑘/𝑒), 1.51, and 28% of Carnot efficiency, respectively. We also find that the …

Go to article

Sequential Infiltration Synthesis Of Silicon Dioxide In Polymers With Ester Groups─Insight From In Situ Infrared Spectroscopy, Mahua Biswas, Vepa Rozyyev, Anil U. Mane, Amelia Korveziroska, Uttam Manna, Jeffrey W. Elam Jan 2024

Sequential Infiltration Synthesis Of Silicon Dioxide In Polymers With Ester Groups─Insight From In Situ Infrared Spectroscopy, Mahua Biswas, Vepa Rozyyev, Anil U. Mane, Amelia Korveziroska, Uttam Manna, Jeffrey W. Elam

Faculty publications – Physics

New strategies to synthesize nanometer-scale silicon dioxide (SiO2) patterns have drawn much attention in applications such as microelectronic and optoelectronic devices, membranes, and sensors, as we are approaching device dimensions shrinking below 10 nm. In this regard, sequential infiltration synthesis (SIS), a two-step gas-phase molecular assembly process that enables localized inorganic material growth in the targeted reactive domains of polymers, is an attractive process. In this work, we performed in situ Fourier transform infrared spectroscopy (FTIR) measurements during SiO2 SIS to investigate the reaction mechanism of trimethylaluminum (TMA) and tri(tert-pentoxy) silanol (TPS) precursors with polymers having ester functional groups (poly(methyl …

Go to article

Weak Effects Of Prebiotically Plausible Peptides On Self-Triphosphorylation Ribozyme Function, Joshua T. Arriola, Shayan Poordian, Estefanía Martínez Valdivia, Tommy Le, Luke J. Leman, Joan G. Schellinger, Ulrich F. Müller Jan 2024

Weak Effects Of Prebiotically Plausible Peptides On Self-Triphosphorylation Ribozyme Function, Joshua T. Arriola, Shayan Poordian, Estefanía Martínez Valdivia, Tommy Le, Luke J. Leman, Joan G. Schellinger, Ulrich F. Müller

Chemistry and Biochemistry: Faculty Scholarship

Catalytic RNAs (ribozymes) were central to early stages of life on earth. The first ribozymes probably emerged in the presence of prebiotically generated peptides because amino acids can be generated under abiotic conditions, and amino acids can oligomerize into peptides under prebiotically plausible conditions. Here we tested whether the presence of prebiotically plausible peptides could have aided the emergence of ribozymes, by an in vitro selection of self-triphosphorylation ribozymes from random sequence in the presence of ten different octapeptides. These peptides were composed of ten different, prebiotically plausible amino acids, each as mixture of D- and L-stereoisomers. After five rounds …

Go to article

Validating Machine And Human Decision-Making In Forensic Fire Debris Analysis, Frances A. Whitehead Jan 2024

Validating Machine And Human Decision-Making In Forensic Fire Debris Analysis, Frances A. Whitehead

Graduate Thesis and Dissertation 2023-2024

This work presents a background on the chemical complexity of fire debris analysis, including an ever-present matrix of pyrolysis products as the catalyst that led to the creation of the National Center for Forensic Science's Fire Debris Database. A selection of these 1,000+ casework-relevant ground truth samples was used to create two newly proposed analyst workflows to connect the current method of categorical reporting with evaluative reporting practices reflective of the strength of the evidence. Both workflows use linear sequential unmasking to help mitigate bias, a discrete scoring system for quantification of the analysis, and receiver operating characteristic (ROC) curves …

Go to article

Thermosensitive Phosphors As Optical Temperature Sensors In Extreme Environments, Marcos Ramon Imer Rocha Pita Jan 2024

Thermosensitive Phosphors As Optical Temperature Sensors In Extreme Environments, Marcos Ramon Imer Rocha Pita

Wayne State University Dissertations

Luminescent temperature sensors offer unique advantages over thermocouples and pyrometers for applications in extreme environments such as operando wall temperature mapping of combustion engines. A refractory oxide host doped with an optically active ion has the potential to afford a thermosensitive phosphor with a well-defined temperature response in such extreme environments. However, the design of thermosensitive phosphors with targeted temperature sensitivity and spatial resolution in the operational temperature range of interest has been hindered by the inability to rationally select host–activator pairs. A major scientific question is what crystal-chemistry features a low thermal conductivity oxide must possess to afford a …

Go to article

Density Functional Studies Of Molecular Separation And Charge Transport, Timothy Quainoo Jan 2024

Density Functional Studies Of Molecular Separation And Charge Transport, Timothy Quainoo

Wayne State University Dissertations

This thesis presents a series of studies which can be grouped majorly into two sections both focusing on the utilization of density functional theory techniques; Molecular electronics and Molecular separation. Molecular electronics has been anticipated to hold a great future as it seeks to apply molecular building blocks in the creation of electronic components. On the other hand, the utilization of mild conditions in chemical processes is geared toward the major goals of green chemistry as it produces less waste and is cost-effective. Thus, this dissertation tackles and answers some of the unanswered questions in literature by using theoretical methods …

Go to article

Design And Synthesis Of Aminoglycoside-Based Heparan Sulfate Mimetics For Structure-Activity Relationship Studies Of Heparan-Binding Proteins, Joseph Wakpal Jan 2024

Design And Synthesis Of Aminoglycoside-Based Heparan Sulfate Mimetics For Structure-Activity Relationship Studies Of Heparan-Binding Proteins, Joseph Wakpal

Wayne State University Dissertations

Cancer remains a formidable challenge in modern medicine, demanding innovative approaches and treatments. Among the emerging strategies, inhibiting heparanase and fibroblast growth factor 2 (FGF2) has garnered considerable attention in recent years. This dissertation presents a novel approach to designing and synthesizing a diverse library of heparan sulfate (HS) mimetics derived from aminoglycosides to study their binding to two heparin-binding proteins involved in cancer development and metastasis. Heparanase cleaves HS polysaccharide chains in the extracellular matrix (ECM) and is a regulator of aggressive tumor behavior. Clinical studies have illustrated that aberrant heparanase expression correlates with increased tumor size, amplified tumor …

Go to article

Sustainable Additive Manufacturing Of Polysulfone Membranes For Liquid Separations, Brian Leonard, Harrison Loh, David Lu, Ebuka A. Ogbuoji, Isabel Escobar, Konstantinos Sierros, Oishi Sanyal Jan 2024

Sustainable Additive Manufacturing Of Polysulfone Membranes For Liquid Separations, Brian Leonard, Harrison Loh, David Lu, Ebuka A. Ogbuoji, Isabel Escobar, Konstantinos Sierros, Oishi Sanyal

UK CARES Faculty Publications

Membranes serve as important components for modern manufacturing and purification processes but are conventionally associated with excessive solvent usage. Here, for the first time, a procedure for fabricating large area polysulfone membranes is demonstrated via the combination of direct ink writing (DIW) with non-solvent induced phase inversion (NIPS). The superior control and precision of this process allows for complete utilization of the polymer dope solution during membrane fabrication, thus enabling a significant reduction in material usage. Compared to doctor blade fabrication, a 63% reduction in dope solution volume was achieved using the DIW technique for fabricating similarly sized membranes. Cross …

Go to article

Temperature-Dependent Stress–Strain Behavior Of Amorphous And Crystalline P3ht, Kehinde H. Fagbohungbe, Connor P. Callaway, Chad Risko Jan 2024

Temperature-Dependent Stress–Strain Behavior Of Amorphous And Crystalline P3ht, Kehinde H. Fagbohungbe, Connor P. Callaway, Chad Risko

UK CARES Faculty Publications

The scalable commercialization of organic electronics wherein p-conjugated polymers serve as the semiconductors hinges on precise control of the material electronic, redox, optical, and mechanical properties, which are each highly influenced by local and long-range morphology. Here, we undertake atomistic molecular dynamics (MD) simulations at three temperatures (150 K, 300 K, and 400 K) to assess the morphological and mechanical response of bulk poly(3-hexylthiophene) (P3HT), a representative homopolymer of interest as an organic semiconductor (OS). As P3HT is a semicrystalline polymer, we characterize mechanical properties for both amorphous and crystalline P3HT models to derive insights into structure–property relationships, including Young’s …

Go to article

Solution Combustion Synthesis And Characterization Of Fumarolic Mineral Dolerophanite, Copper (Ii) Oxide Sulfate, Eric J. Cyganowski Jan 2024

Solution Combustion Synthesis And Characterization Of Fumarolic Mineral Dolerophanite, Copper (Ii) Oxide Sulfate, Eric J. Cyganowski

Chemistry & Biochemistry Theses - Archive

Dolerophanite Cu2OSO4 is a rare mineral found almost exclusively in the fumaroles of volcano systems and is sensitive to temperature and humidity conditions. It has a monoclinic C2/m crystal structure characterized by two-dimensional layers composed of sulfate anions dispersed amongst copper (II) oxide backbones. There has been recent interest in dolerophanite due to the magnetic properties of its Kagome-like lattice as well as its potential use as a photocatalyst or Li-ion battery electrode. Literature on the material however has been limited by the available synthesis strategies. As such, this thesis work presents a novel strategy …

Go to article

Gas Evolution Of A Nickel-Zinc Cell, Niklas Landgraf Jan 2024

Gas Evolution Of A Nickel-Zinc Cell, Niklas Landgraf

Graduate Theses/Dissertations

Batteries are a foundational technology in some of the industries most essential to humanity. Often, their advancement to achieve better performance impacts human lives positively. There are a wide variety of battery chemistries that have been utilized, and the differences in their properties have caused them to be used in many distinct niche applications. Nickel-Zinc (NiZn) batteries are desirable because of their recyclable materials, high cell voltage, and high cycle-life. However, it experiences undesirable shape-change of its electrode materials and gas production due to the electrolysis of the aqueous electrolyte. These can lead to a decrease in capacity over many …

Go to article

The Impact Of Fluorination On The Volatility Of A Series Of Lanthanide Complexes, Kh Mahfuzul Alam Jan 2024

The Impact Of Fluorination On The Volatility Of A Series Of Lanthanide Complexes, Kh Mahfuzul Alam

Dissertations and Theses

Volatile lanthanides have been proposed for applications such as chemical vapor deposition precursors and facilitating f-element separations. The latter is motivated by their broad use in technological applications. In collaboration with synthetic chemists, we studied Ln-complexes with functionalized forms of the bulky tris[(4-hydroxy-pentenylidene-2-imino)ethyl]amine (TRAC) ligand. Five ligands, labeled Yb(CH3,CH3TRAC), Yb(CH3,CF3TRAC), Yb(CF3,CF3TRAC), Yb(CF3,C3F7TRAC) and Nd(tbu,C3F7TRAC) were synthesized and volatile Ln complexes were obtained. However, the temperature at which they sublime was not sufficiently low for industrial applications. Therefore, this work examined the experimentally characterized Yb(CH3,CH3TRAC), Yb(CH3,CF3TRAC), Yb(CF3,CF3TRAC), Yb(CF3,C3F7TRAC) and Nd(tbu,C3F7TRAC) in detail. The importance of interactions between two neighboring molecules in …

Go to article

Activation Of Molecular Oxygen For The Selective Oxidation Of Alkenes Catalyzed By Hollow Mn3o4 Nanoparticles, Pranab Kumar Nandy Jan 2024

Activation Of Molecular Oxygen For The Selective Oxidation Of Alkenes Catalyzed By Hollow Mn3o4 Nanoparticles, Pranab Kumar Nandy

Dissertations and Theses

This dissertation describes two distinct projects: 1) hollow Mn3O4 nanoparticles for selective oxidation of alkenes with O2, and 2) investigation of chloro[2-(mesityl(quinoline-8-yl-κN)boryl]-3,5-dimethyl-phenyl}methyl-κC)palladium(II) for activation of C-F bonds in aryl fluorides. Hollow Mn3O4 nanoparticles were synthesized from the galvanic reaction between Cu2+ and MnO nanocrystals. The hollow Mn3O4 particles were characterized with transmission electron microscopy and powder X-ray diffraction. The particles have diameter of 31 nm and a hollow cavity of 16 nm. We investigated the role of the hollow Mn3O4 nanoparticles in the selective oxidation of organic substrates with molecular oxygen. The results indicate that the hollow Mn3O4 nanoparticles catalyze …

Go to article

Advancing Anti-Counterfeiting Approach Via The Development Of Functional Optical Materials, Zishen Yang Jan 2024

Advancing Anti-Counterfeiting Approach Via The Development Of Functional Optical Materials, Zishen Yang

Dissertations and Theses

Counterfeiting poses a significant threat to public health and safety, necessitating robust measures to combat it. Addressing this challenge requires the development of advanced materials and techniques, coupled with a comprehensive understanding of the obstacles inherent in anti-counterfeiting endeavors. Our study delved into two approaches for crafting anti-counterfeiting technologies: plasmonic and luminescence materials. We thoroughly examined the challenges associated with each method and proposed viable solutions. Notably, we devised a streamlined process for producing inkjet printable Surface-enhanced Raman Scattering (SERS) ink, enabling the creation of low-cost covert quick response (QR) codes with a high storage capacity. Access to the encoded …

Go to article

Advanced Optical Biosensing Using Ratiometric Fluorescent Polymer Dots And Nanozyme, Shuyi He Jan 2024

Advanced Optical Biosensing Using Ratiometric Fluorescent Polymer Dots And Nanozyme, Shuyi He

Dissertations and Theses

Biosensors have been deeply valued and widely used in fermentation technology, environmental monitoring, food engineering, clinical medicine, and the military. However, current biosensors still face many technical challenges, such as miniaturization, convenience, high precision, and low power consumption which restrict the popularization and development of biosensors. Meeting these challenges require the development of advanced materials and technologies. Optical biosensors offer distinct advantages such as high sensitivity, rapid response time, and the potential for miniaturization, making them ideal for overcoming the existing limitations. My research in this dissertation explores the development and application of advanced functional nanomaterials in optical biosensing, focusing …

Go to article

Binary Phase Nio-Tio2 Heterojunction For Photocatalytic H2o2 Formation, Rashed Mia Jan 2024

Binary Phase Nio-Tio2 Heterojunction For Photocatalytic H2o2 Formation, Rashed Mia

Dissertations and Theses

The overreliance on fossil fuels contributes to geopolitical, economic, and environmental risks that adversely affect society. Photocatalytic processes in which light energy is used to drive endothermic chemical steps, such as water splitting to hydrogen and oxygen, could contribute solutions to these energy and environmental issues. Numerous substances have been developed that can effectively catalyze solar water splitting; however, their efficiency has yet to reach cost equivalence with rival technologies. The most studied materials employ semiconductors for light absorption, modified with co-catalysts to gather photogenerated charge carriers and promote electron transfer, thereby enabling endothermic redox reactions to occur. Anatase TiO2 …

Go to article

Functionalization Of Pristine And Defective Monolayer Graphene To Control Biofilm Growth, Md Tusar Uddin Jan 2024

Functionalization Of Pristine And Defective Monolayer Graphene To Control Biofilm Growth, Md Tusar Uddin

Dissertations and Theses

Biofilms are surface-attached microorganism communities that are embedded in extracellular matrix. They play a significant role in different infections which cause many life-threatening diseases in the world population. Many strategies have been developed to control biofilm formation and microbial adhesion on the surface such as coating by an antimicrobial agent, chemical modification of surfaces, and physical destruction of biofilm areas. However, these techniques are not sufficient to limit the widespread biofilm formation. Therefore, new antimicrobial strategies need to be developed to control these often antibiotics-resistant microorganisms. The aim of our work is to develop novel materials to maximize the capability …

Go to article

Calcium Carbonate-Based Stimuli-Responsive Microcarriers For Targeted Drug Delivery Against Oral Bacterial Infections And Development Of Glass-Free Microfluidics As An Analytical Platform, Krishantha Wijewardhane Jan 2024

Calcium Carbonate-Based Stimuli-Responsive Microcarriers For Targeted Drug Delivery Against Oral Bacterial Infections And Development Of Glass-Free Microfluidics As An Analytical Platform, Krishantha Wijewardhane

Dissertations and Theses

Dental diseases present a significant global health challenge, affecting individuals across all age groups. This spectrum of oral health issues encompasses conditions like dental caries, periodontitis (gum disease), and oral infections. In the customer discovery interviews, dental patients have raised concerns about potential drug overexposure during and after procedures, driven by fears of adverse effects, allergies, and the increasing use of antibiotics and anesthesia. Dentists are increasingly focused on minimizing opioid and steroid-based medication doses due to potential side effects and addiction risks. This study explores an innovative approach to targeted drug delivery in the dental environment using eco-friendly and …

Go to article

A Breast Cancer Stem Active Cobalt(Iii)-Cyclam Complex Containing Flufenamic Acid With Immunogenic Potential, Jiaxin Fang, Owamagbe N. Orobator, Chibuzor Ngozi Olelewe, Ginevra Passeri, Kuldip Singh, Samuel G. Awuah, Kogularamanan Suntharalingam Jan 2024

A Breast Cancer Stem Active Cobalt(Iii)-Cyclam Complex Containing Flufenamic Acid With Immunogenic Potential, Jiaxin Fang, Owamagbe N. Orobator, Chibuzor Ngozi Olelewe, Ginevra Passeri, Kuldip Singh, Samuel G. Awuah, Kogularamanan Suntharalingam

Chemistry Faculty Publications

The cytotoxic and immunogenic-activating properties of a cobalt(III)-cyclam complex bearing the non-steroidal anti-inflammatory drug, flufenamic acid is reported within the context of anti-cancer stem cell (CSC) drug discovery. The cobalt(III)-cyclam complex 1 displays sub-micromolar potency towards breast CSCs grown in monolayers, 24-fold and 31-fold greater than salinomycin (an established anti-breast CSC agent) and cisplatin (an anticancer metallopharmaceutical), respectively. Strikingly, the cobalt(III)-cyclam complex 1 is 69-fold and 50-fold more potent than salinomycin and cisplatin towards three-dimensionally cultured breast CSC mammospheres. Mechanistic studies reveal that 1 induces DNA damage, inhibits cyclooxygenase-2 expression, and prompts caspase-dependent apoptosis. Breast CSCs treated with 1 exhibit …

Go to article

Unusual Eluents, Small Systems, And Digital Signal Processing For Highly Efficient Greener Separations, Troy T. Handlovic Jan 2024

Unusual Eluents, Small Systems, And Digital Signal Processing For Highly Efficient Greener Separations, Troy T. Handlovic

Chemistry & Biochemistry Dissertations - Archive

Separation science is a rapidly evolving field, where routine analyses are now done at speeds and efficiencies not thought to be possible several years ago. The tangential field of green analytical chemistry is evolving at an even faster rate and can be considered to be in its infancy stage. As green analytical chemistry is better understood, the greenness of a method will be considered during standard method development just as resolution, sensitivity, and efficiency are considered now. The first portion of this dissertation focuses on the development of mathematical and pragmatic methods to minimize the analytical method greenness score, and …

Go to article

Development Of Vacuum-Assisted Headspace High-Capacity Solid-Phase Microextraction For The Determination Of Semi-Volatile Compounds From Samples At Lower Temperatures, Shannon L. Thomas, Kevin A. Schug, Colton Myers, Jason S. Herrington, Reagan L. Miller, Anush Pabley, Frank W. Foss Jan 2024

Development Of Vacuum-Assisted Headspace High-Capacity Solid-Phase Microextraction For The Determination Of Semi-Volatile Compounds From Samples At Lower Temperatures, Shannon L. Thomas, Kevin A. Schug, Colton Myers, Jason S. Herrington, Reagan L. Miller, Anush Pabley, Frank W. Foss

Chemistry & Biochemistry Dissertations - Archive

Vacuum-assisted headspace solid-phase microextraction (Vac-HS-SPME) is a method used to increase solid-phase microextraction sampling of semi-volatile organic compounds. Three studies were conducted using Vac-HS-SPME via gas chromatography - mass spectrometry (GC-MS) methods for analysis of various sample types. First, a study was performed using Vac- HS-SPME combined with a high-capacity (HC) SPME Arrow to determine the operational fundamentals and workflow necessary to achieve optimal extraction of semi-volatile compounds from a model solid matrix (Ottawa sand). The fundamentals investigated included the seals necessary to create a leak-free sampling vial under vacuum conditions; the magnitude of the vacuum exerted, and the time …

Go to article

Interface Engineering Of Lithium Metal Anodes Via Atomic And Molecular Layer Deposition, Xiangbo Meng Jan 2024

Interface Engineering Of Lithium Metal Anodes Via Atomic And Molecular Layer Deposition, Xiangbo Meng

Mechanical Engineering Faculty Publications and Presentations

Rechargeable batteries are playing an ever-increasing important role in our society. Their performance (such as cell cyclability, safety, and lifespan) is critical for their applications. Among the various factors related to cell performance, interfaces, which ubiquitously exist between an electrode and an electrolyte, have some significant functions. They mostly evolve and degrade with cell cycling. Thus, an ideal interface should be physically and electrochemically stable and able to provide a compatible environment for electrolytes and electrodes in cells. To this end, interface engineering is needed and has become an important area. It has been achieved via different strategies. In the …

Go to article

Phenanthrene Jamboree, Alexander D. Roth Jan 2024

Phenanthrene Jamboree, Alexander D. Roth

Honors Theses

Using cyclopropanated and cyclobutanated phenanthrene precursors, our hero embarks on a mission to find as many reactive intermediates as possible. Fraught with danger, romance, and mangosteens, Anderson calls this work 'monstrous' and 'alarming.'

Go to article

Formation Rates Of Silver Metal Danoprisms As A Function Of Halide Concentration, Steven Akins Jan 2024

Formation Rates Of Silver Metal Danoprisms As A Function Of Halide Concentration, Steven Akins

Master's Theses and Doctoral Dissertations

anosystem morphology control is proving to be vital for developing nano technologies. This control allows for the optimization of a nanoparticle’s optical and electrical properties. One form of control is the addition of defects during nanocrystal formation. Nanoprisms are highly responsive to this form of control through halide concentration. However, the rate at which this control occurs has remained relatively unexplored. The formation kinetics of silver nanoprisms were monitored before, during, and after crystal formation as a function of halide concentration. The standard deviations between multiple replicates were found to be too large for this method to reach conclusions about …

Go to article

Atg11 And Atg9 Interaction In Selective Autophagy, Chimi Dolker Sherpa Jan 2024

Atg11 And Atg9 Interaction In Selective Autophagy, Chimi Dolker Sherpa

Master's Theses and Doctoral Dissertations

Selective autophagy, induced by cellular stresses, degrades/recycles a specific cargo. Ithelps prevent diseases like Parkinson’s, Huntington's, cancer, and bacterial infections. It involves the formation of an autophagosome, a double-membrane vesicle that takes the cargo to the vacuole/lysosome for degradation. Atg11, the central organizer of selective autophagy, acts as a scaffold protein, interacting with Atg9, Atg1 and other Atg proteins. Our research focuses on finding mutations in Atg11 that specifically disrupt its interaction with Atg9 without affecting its dimerization or interaction with Atg1. We targeted residues 455-535 of Atg11 as a putative Atg9 interaction site, performing mutagenesis on four key residues …

Go to article

Economic Material For Large-Scale H2 Storage And H2-Co2 Separation, Hussein R. Abid, Alireza Keshavarz, Header Jaffer, Basim K. Nile, Stefan Iglauer Jan 2024

Economic Material For Large-Scale H2 Storage And H2-Co2 Separation, Hussein R. Abid, Alireza Keshavarz, Header Jaffer, Basim K. Nile, Stefan Iglauer

Research outputs 2022 to 2026

Hydrogen is a clean fuel that can potentially completely decarbonize the energy supply chain and mitigate global warming. Hydrogen – a highly volatile gas – however, needs to be separated from CO2 during H2 production, and also from cushion gas in H2 geo-storage projects; in addition, large-scale H2 storage is a key obstacle. We thus tested and chemically upgraded common sub-bituminous coal as a material for H2-CO2 separation and H2 storage. The coal adsorbed significant amounts of H2 and CO2 and demonstrated an excellent H2-CO2 separation efficiency if chemically modified. The work presented here thus provides fundamental data required for …

Go to article

Editorial: The Marine Iodine Cycle, Past, Present, And Future, Rosie Chance, Gregory A. Cutter, Dalton S. Hardisty, Anoop S. Mahajan Jan 2024

Editorial: The Marine Iodine Cycle, Past, Present, And Future, Rosie Chance, Gregory A. Cutter, Dalton S. Hardisty, Anoop S. Mahajan

OES Faculty Publications

In this Research Topic, we bring together ten articles from the diverse research communities interested in the marine iodine cycle, including paleoceanographers, atmospheric chemists, and biogeochemists. The physical chemistry underpinning iodine’s chemical speciation and transformations in the ocean is reviewed by Luther; this paper provides a theoretical basis for the field observations presented in this Research Topic.

Go to article

First Prev Next Last