Surface Chemistry And Transport Properties Of Ii-Vi Semiconductor Nanowires,
2016
University of South Carolina
Surface Chemistry And Transport Properties Of Ii-Vi Semiconductor Nanowires, Pravin Paudel
Theses and Dissertations
Semiconductor nanowires have been widely studied due to their unique properties such as width comparable to critical length-scales, high aspect ratio, and high carrier mobility. These unique properties make them a suitable candidate for various optical and electronic devices like photovoltaics, photodetectors, and field effect transistors. The nanowire surface plays an important role in the performance of these devices because of their high surface to volume ratio. The larger surface area of nanowires may provide better charge separation than planar heterostructures in photovoltaics by providing shorter distance to move for carrier before separation, however, presence of surface states may lead …
Synthesis And Characterization Of Azo-Guanidine Based Alcoholic Media Naked Eye Dna Sensor,
2016
Old Dominion University
Synthesis And Characterization Of Azo-Guanidine Based Alcoholic Media Naked Eye Dna Sensor, Ataf A. Altaf, Uzma Hashmat, Muhammad Yousaf, Bhajan Lal, Shafiq Ullah, Alvin A. Holder, Amin Badshah
Chemistry & Biochemistry Faculty Publications
DNA sensing always has an open meadow of curiosity for biotechnologists and other researchers. Recently, in this field, we have introduced an emerging class of molecules containing azo and guanidine functionalities. In this study, we have synthesized three new compounds (UA1, UA6 and UA7) for potential application in DNA sensing in alcoholic medium. The synthesized materials were characterized by elemental analysis, FTIR, UV-visible, 1H NMR and 13C NMR spectroscopies. Their DNA sensing potential were investigated by UV-visible spectroscopy. The insight of interaction with DNA was further investigated by electrochemical (cyclic voltammetry) and hydrodynamic (viscosity) studies. …
Talking Through The Problems: A Study Of Discourse In Peer-Led Small Groups,
2016
Washington University in St. Louis
Talking Through The Problems: A Study Of Discourse In Peer-Led Small Groups, Michelle D. Repice, R. Keith Sawyer, Mark C. Hogrebe, Patrick L. Brown, Sarah Luesse, Daniel J. Gealy, Regina F. Frey
SIUE Faculty Research, Scholarship, and Creative Activity
Increasingly, studies are investigating the factors that influence student discourse in science courses, and specifically the mechanisms and discourse processes within small groups, to better understand the learning that takes place as students work together. This paper contributes to a growing body of research by analyzing how students engage in conversation and work together to solve problems in a peer-led small-group setting. This qualitative study evaluates video of Peer-Led Team Learning (PLTL) sessions in general chemistry, with attention to both the activity structures and the function of discourse as students undertook different types of problems across one semester. Our findings …
Theoretical Estimation Of PkA'S Of Pyrimidines And Related Heterocycles,
2016
Wright State University
Theoretical Estimation Of PkA'S Of Pyrimidines And Related Heterocycles, Rachael Ann Wessner
Browse all Theses and Dissertations
Pyrimidines and related heterocycles are an important class of compounds with a wide variety of applications. As a result, there is great interest in the chemical properties of these compounds, specifically their pKa's. Despite the importance of these compounds their reported pKa's are often only approximations or are completely absent from literature. Experimentally measuring pKa's can be challenging, especially if the pKa is below zero. Alternatively, pKa's can be estimated computationally using a Quantitative Structure-Activity Relationship (QSAR). However, most of the compounds included in this study exist as two or more forms that arise from tautomerism. Tautomerism complicates the estimation …
An Investigation Of The Adsorption Behavior Between Silver Nanoparticles (Agnps) And Corundum (Α-Al2O3) At Environmental Ph Values Using Inductively-Coupled Plasma Optical Emission Spectroscopy (Icp-Oes) And Raman Spectroscopy,
2016
Wright State University
An Investigation Of The Adsorption Behavior Between Silver Nanoparticles (Agnps) And Corundum (Α-Al2O3) At Environmental Ph Values Using Inductively-Coupled Plasma Optical Emission Spectroscopy (Icp-Oes) And Raman Spectroscopy, Kevin Andrew O'Neil
Browse all Theses and Dissertations
With the increased use of silver nanoparticles (AgNPs) in consumer products, the need to monitor their release into environmental soils has become critical. Although minerals make up a large component of soils, research on their interactions with AgNPs is still limited. Furthermore, the majority of the existing research focused on silica-based minerals rather than metal oxides, which is the second most abundant mineral type in the earth's crust. This study examined for the first time the aqueous interaction between the widely used, spherical Creighton AgNPs and a-corundum (a-Al2O3), a representative non-silica-based mineral, at environmentally relevant pH values (6-11). Samples were …
Synthesis And Characterization Of Peek Analogues Utilizing 3,5- And 2,4-Difluorobenzophenone.,
2016
Wright State University
Synthesis And Characterization Of Peek Analogues Utilizing 3,5- And 2,4-Difluorobenzophenone., Zachary Ewing
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Two routes to semi-crystalline, potentially functionalizable poly(ether ether ketone), PEEK, analogues were explored using varying percentages of 4,4’-difluorobenzophenone and either 3,5-difluorobenzophenone or 2,4-difluorobenzophenone as the electrophilic component in nucleophilic aromatic substitution polycondensation reactions with hydroquinone. PEEK analogues utilizing 3,5-difluorobenzophenone were carried out in a “one-pot” fashion and their properties were compared to the same materials prepared previously by a multi-step synthetic procedure. The use of 2,4-difluorobenzophenone led to completely new PEEK analogues. The polymers were characterized via NMR spectroscopy, Size Exclusion Chromatography, Thermogravimetic Analysis, and Differential Scanning Calorimetry. Molecular weight determinations showed the synthesized polymers to be of a variety …
Bioavailability And Transformation Of Silver Nanoparticles In The Freshwater Environment,
2016
Wright State University - Main Campus
Bioavailability And Transformation Of Silver Nanoparticles In The Freshwater Environment, Seth W. Brittle
Browse all Theses and Dissertations
The proliferation of silver nanoparticles (AgNPs) in consumer products and industrial applications has generated many environmental concerns since the chemistry of silver changes at the nanoscale and the very properties that make them desirable – their unique reactivity – may pose environmental risks. This dissertation addresses these concerns from three different angles. First, freshwater crayfish is demonstrated as a potential benthic indicator of Ag pollution since Ag accumulation depends on the form of Ag. The uptake and distribution of Ag (from AgNPs or Ag+) in tissue samples were measured by inductively coupled plasma optical emission spectroscopy (ICP-OES). The hepatopancreas (1.5-17.4 …
Design And Application Of Facile Routes To N-Heterocycle Functionalized Poly(Arylene Ether)S,
2016
Wright State University
Design And Application Of Facile Routes To N-Heterocycle Functionalized Poly(Arylene Ether)S, Abraham K. Kemboi
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A series of 3,5-difluorinated systems, which are activated towards nucleophilic aromatic substitution (NAS) by the strongly electron withdrawing benzoxazole or benzothiazole groups, located meta to the fluorines were prepared and fully characterized. The monomers also carry various N-heterocyclic species on the non-fluorinated ring. The corresponding poly(arylene ether)s, some of which were copolymers with triphenylphosphine oxide-based monomers, were prepared via standard NAS polycondensation reactions. Incorporation of the monomers containing N-heterocycle units was determined by NMR spectroscopy. Characterization of the thermal properties was done using thermogravimetric analysis (TGA) and differential scanning (DSC). Most of the polymers displayed good film forming properties when …
Alkylenedioxy Containing Peek Polymers Containing Meta Linkages,
2016
Wright State University
Alkylenedioxy Containing Peek Polymers Containing Meta Linkages, James Uchenna Ohaeri
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The oxyalkylene containing, meta linked monomers 1,2-bis(3-(4-fluorobenzoyl)phenoxy)ethane, 1,3-bis(3-(4-fluorobenzoyl)phenoxy)propane, 1,4-bis(3-(4-fluorobenzoyl)phenoxy)butane, 1,5-bis(3-(4-fluorobenzoyl)phenoxy)pentane can be prepared by a three-step process starting with the dialdehydes (1,2-bis(3-formylphenoxy)ethane, 1,3-bis(3-formylphenoxy)propane, 1,4-bis(3-formylphenoxy)butane and 1,5-bis(3-formylphenoxy)pentane, respectively). Polymerization of the monomers with bisphenol-A gave soluble, thermally stable amorphous poly(ether ether ketone)s. The polymers exhibited molecular weights of (Mw/Mn) (21,841/ 8721) g/mol, (21,195/ 7569) g/mol, (9,107/ 2819) g/mol and (12,990/ 4723) g/mol, respectively. Thermal analyses of the polymers revealed Tgs of 112º, 106º, 92º and 91º, respectively and 5% weight losses under a nitrogen atmosphere of 389º, 410º, 411º and 414º, respectively.
Determination Of Atmospheric Particulate Matter Composition In The Dayton Metro Area,
2016
Wright State University
Determination Of Atmospheric Particulate Matter Composition In The Dayton Metro Area, Saagar Mahendra Patel
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Quartz filters from high-volume air samplers of particulate matter of a size less than 10 micrometers in diameter (PM10) located in Moraine and Yellow Springs, Ohio, were obtained from the Regional Air Pollution Control Agency and analyzed for levoglucosan, metals, and the EPA 16 priority polycyclic aromatic hydrocarbons (PAHs). Average concentration of levoglucosan increased as ambient temperature decreased. Winter concentrations of levoglucosan for Moraine and Yellow Springs were 39.41 ± 31.58 µg/g and 51.52 ± 27.44 µg/g, respectively, which is due to a greater amount of residential wood burning in the colder months. The concentration of biomass burning …
Forensic Characterization Of Dyes From Synthetic Textile Fibers Exposed To Outdoor And Laundering Effects By Ultra Performance Liquid Chromatography And Spectral Analysis,
2016
University of South Carolina
Forensic Characterization Of Dyes From Synthetic Textile Fibers Exposed To Outdoor And Laundering Effects By Ultra Performance Liquid Chromatography And Spectral Analysis, Molly Rebecca Burnip
Theses and Dissertations
Textile fibers found in an investigation are trace evidence that can connect a suspect to a victim or crime scene. Examination involves comparison of the color and morphology of a questioned fiber to a known fiber with optical spectroscopy. Fibers are considered class evidence, so evaluating more characteristics increases their significance as evidence if a match cannot be excluded. Acrylic, nylon, and polyester are textile polymers that require different extraction solvents based on the polymer chemistry. Methods have been developed for UPLC analysis of basic dyes on acrylic, acid on nylon, and disperse dyes on polyester. After microextraction from single …
Supplemental Materials For Building Data And Information Literacy In The Undergraduate Chemistry Curriculum,
2016
James Madison University
Supplemental Materials For Building Data And Information Literacy In The Undergraduate Chemistry Curriculum, Yasmeen Shorish, Barbara A. Reisner
Department of Chemistry and Biochemistry - Faculty Scholarship
Course syllabus from Chem 481, Fall 2015, to supplement the chapter "Building Data and Information Literacy in the Undergraduate Chemistry Curriculum" in the monograph Integrating Library and Information Literacy Into Chemistry Curricula - ACS Symposium Series, ACS Publications.
Building Data And Information Literacy In The Undergraduate Chemistry Curriculum,
2016
James Madison University
Building Data And Information Literacy In The Undergraduate Chemistry Curriculum, Yasmeen Shorish, Barbara A. Reisner
Department of Chemistry and Biochemistry - Faculty Scholarship
The Literature and Seminar sequence at James Madison University has been used to develop the chemistry information literacy skills of chemistry majors for over four decades. These courses have been continually updated to emphasize information literacy skills for the twenty-first century. This chapter describes the methods that have been developed to improve chemical, data and general information literacy at a large, public, primarily undergraduate institution. The focus of the first semester course, described in this chapter, is on skill building rather than teaching specific resources. It is a model of integration and collaboration between chemistry faculty and chemistry librarians. Changes …
Content Analysis Of The Discussion Of The Atom In General Chemistry Textbooks Using Evaluation Criteria Based On The Nature Of Science And Philosophy Of Chemistry,
2016
Ateneo de Manila University
Content Analysis Of The Discussion Of The Atom In General Chemistry Textbooks Using Evaluation Criteria Based On The Nature Of Science And Philosophy Of Chemistry, Armando M. Guidote Jr, Angelo Julian E. Perez, Gilbert U. Yu, Michael Ner E. Mariano
Chemistry Faculty Publications
Evaluation criteria are adapted from previous textbook analyses on the nature of science (NOS) in general chemistry textbooks. These criteria are used to determine how certain NOS dimensions are mentioned and elaborated in those textbooks. Such dimensions emphasize that chemistry is (1) tentative, (2) empirical, (3) model-based, (4) inferential, (5) has technological products, (6) employs instrumentation, and (7) possesses social and societal dimensions. Three book chapters were read and evaluated: the first (on chemistry in general); the second (on atomic structure); and the sixth or seventh chapters (on the electronic structure of atoms). The relevant content in each textbook were …
Paleolithic Protection In A Western World: A Look Into Preagricultural Nutrition As A Remedy For The Diseases Of Civilization,
2016
University of Mississippi. Sally McDonnell Barksdale Honors College
Paleolithic Protection In A Western World: A Look Into Preagricultural Nutrition As A Remedy For The Diseases Of Civilization, Emilie R. Caron
Honors Theses
The aim of this investigation is to discover the associations of the Western diet to noncommunicable diseases and to determine if a reversion to a Paleolithic diet will provide treatment and prevention of these diseases. Noncommunicable diseases, otherwise known as Diseases of Civilization, are lifestyle influenced diseases and encompass obesity, diabetes mellitus, cardiovascular disease, and associated cancers. Incidences of these diseases have skyrocketed in the past century and show no signs of decline. Since 1900, the death rates due to heart disease and cancer have risen to account for 47% of total deaths in the United States in 2010. (Tippett, …
A Computational Study Of High Energy Density Materials And Their Detection Using Surface-Enhanced Raman Spectroscopy,
2016
University of Mississippi. Sally McDonnell Barksdale Honors College
A Computational Study Of High Energy Density Materials And Their Detection Using Surface-Enhanced Raman Spectroscopy, Emily N. Hugo
Honors Theses
The purpose of this thesis is to theoretically predict the vibrational spectra of select high energy density materials (HEDMs) as well as some of their byproducts and to determine if using surface-enhanced Raman spectroscopy (SERS) could be a viable detection method for these compounds. Studying the vibrational patterns of these compounds will help in identifying them in the environment for remediation purposes. Because the byproducts are smaller and easier to model than the parent compounds, these were studied more in depth through analyzing their Infrared and Raman spectra. Ag2 was used to model the interactions between the Ag nanoparticles used …
Rhenium-Pyridyl-Nhcs For Photocatalytic Co2 Reduction,
2016
University of Mississippi. Sally McDonnell Barksdale Honors College
Rhenium-Pyridyl-Nhcs For Photocatalytic Co2 Reduction, Emily Anne Sharpe
Honors Theses
The ability to transform CO2 into a useable fuel source would have a remarkably positive impact on the environment by taking the vast amounts of previous unusable CO2 from the atmosphere and reducing it to CO, which can then be turned into fuel. This project involves the synthesis and testing of air and water stable Re (I) pyridyl N- heterocyclic carbene (NHC) compounds for photocatalytic reduction of CO2 into CO using a simulated solar spectrum. Previous research in this area focused on the use of Re(bpy)CO3X, which quickly became the benchmark of homogeneous CO2 reduction photocatalysts. The Re (I) pyridyl …
Study Of An Active-State Cb1 Receptor Model And Jwh Compound Interactions To Predict New Emerging Synthetic Cannabinoids,
2016
University of Mississippi. Sally McDonnell Barksdale Honors College
Study Of An Active-State Cb1 Receptor Model And Jwh Compound Interactions To Predict New Emerging Synthetic Cannabinoids, Kelsey Leigh Pettus
Honors Theses
In recent years, a new class of compounds, called synthetic cannabinoids, have made their appearance in the market as a substitute for illegal marijuana or its constituent natural cannabinoids. These compounds, which are active at the same G- protein coupled receptors (GPCRS) as cannabinoids, are continuing to gain popularity because of the same cannabinoid-like effects they create. Though two cannabinoid receptors have been identified in humans, known as CB1 and CB2, synthetic cannabinoid activity at the CB1 receptor has been the focus of much research regarding synthetic cannabinoid ligand binding. In this study, the structure of the CB1 receptor is …
Indolizine-Squaraine Nir Emissive Materials,
2016
University of Mississippi. Sally McDonnell Barksdale Honors College
Indolizine-Squaraine Nir Emissive Materials, Tana A. Rill
Honors Theses
Near-infrared (NIR) emissive organic materials are an emerging area of study with an array of applications for both military and civilian purposes including night vision technologies, secure communications, surveillance, homing, fluoresence imaging, secure displays as NIR OLED materials, heat-blocking coatings, in vivo fluoresence biological imagaing, and additional optoelectronics device applications. We have developed a series of organic NIR emissive materials based on an indolizine donor and squaraine acceptor. The novel-to-squaraine donor, indolizine, exhibits a remarkable increase in absorption maximum wavelength when compared with benchmark indoline-based squaraine dyes (700 nm vs. 625 nm) with molar absorptivities ranging from 100,000-262,000 M-1cm-1. Emission …
Method Development Toward The Analysis Of The Functionalization Of Proteins,
2016
University of Mississippi. Sally McDonnell Barksdale Honors College
Method Development Toward The Analysis Of The Functionalization Of Proteins, Victoria Calcote
Honors Theses
Calmodulin is a ubiquitous small intracellular protein that functions as a receptor for regulatory calcium signals and thus regulates a multitude of physiological processes in organisms as diverse as yeast, fruit flies, and mammals. Since its structure and function have been extensively studied, our goal is to create a calmodulin biomaterial, with the ultimate goal of in situ drug delivery or as a scaffold for stem cell growth and differentiation. We plan to create this biomaterial by using Click Chemistry, the rapid creation of new heteroatom bonds through a copper-catalyzed azide-alkyne cycloaddition. The bonds are created by treating calmodulin as …
