Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Keyword
-
- Actinide (2)
- Acid base model (1)
- Analytical Chemistry (1)
- Argumentation (1)
- Assessment (1)
-
- Atomic model (1)
- Atomic size (1)
- BeSocratic (1)
- Bioanalysis (1)
- Bioanalytical (1)
- CLUE (1)
- Carbon Dots (1)
- Carbon dioxide (1)
- Conjugated polymer nanoparticles (1)
- Conjugated polymers (1)
- Covalent bonding (1)
- Curriculum (1)
- Cyclopropane (1)
- Detection (1)
- Energy Converion (1)
- Halofunctionalization (1)
- Hematite (1)
- Imaging (1)
- Ionomers (1)
- Mental model (1)
- Nitrodiene (1)
- Organometallic (1)
- Photocatalysis (1)
- Plasma (1)
- Plutonium (1)
Articles 1 - 11 of 11
Full-Text Articles in Chemistry
Surface Modifications Of Capillary-Channeled Polymer (C-Cp) Fiber Stationary Phases: Improving The Efficiency Of Highly Selective Analyte Separations, Abby Schadock-Hewitt
Surface Modifications Of Capillary-Channeled Polymer (C-Cp) Fiber Stationary Phases: Improving The Efficiency Of Highly Selective Analyte Separations, Abby Schadock-Hewitt
All Dissertations
High performance liquid chromatography (HPLC) is a fundamental methodology for the characterization and purification of macromolecules. Since its development in the 1970's, HPLC has significantly advanced its instrumentation and column technology to become a powerful analytical technique. A considerable amount of research focuses on advancements to the stationary phase, or solid support, on which molecules interact and separate. To overcome limitations of other phases that lead to poor mass transfer, slow speeds, and low efficiency, nonporous and superficially porous phases have been developed. Specifically, fiber based polymer stationary phases show great promise as stationary phases for protein separations. The Marcus …
Toward Understanding The Thermodynamics And Mechanisms Of Actinide Sorption Reactions, Shanna Estes
Toward Understanding The Thermodynamics And Mechanisms Of Actinide Sorption Reactions, Shanna Estes
All Dissertations
The environmental fate of actinides is greatly influenced by interfacial reactions, including sorption onto solid surfaces. Because changes in the primary hydration sphere of the actinide are expected to greatly influence the thermodynamics (i.e., reaction enthalpy and entropy) of these reactions, examining actinide sorption thermodynamics may provide insight into actinide sorption mechanisms. Additionally, examining actinide sorption thermodynamics may enhance the ability to model or predict these reactions in environmental or engineered systems where variable or elevated temperatures are expected. However, few researchers have studied actinide sorption thermodynamics. Therefore, this research examined the thermodynamics of Eu(III) (a trivalent actinide analog), Th(IV), …
Experimental Evidence For Colloid-Facilitated Transport Of Plutonium, Hilary Emerson
Experimental Evidence For Colloid-Facilitated Transport Of Plutonium, Hilary Emerson
All Dissertations
Colloid-facilitated transport of the actinides has been observed previously in the field on the kilometer scale. The objective of this work is to investigate the mechanisms of colloid-facilitated transport with controlled settings and conditions. The experimental work in this dissertation investigates transport of a ternary complex with iron oxide colloids, organic ligands and actinides in the presence of quartz or a natural sandy soil as well as simplified systems building up to the ternary complexes. The first three papers investigate the following: (1) unsaturated transport of iron oxide colloids in a natural sandy soil lysimeter with and without natural organic …
Neutron Study Of Structure And Dynamics Of Rigid Polymers, Naresh Osti
Neutron Study Of Structure And Dynamics Of Rigid Polymers, Naresh Osti
All Dissertations
The structure and the dynamics in two different classes of rigid polymers; ionomers and rigid luminescent polymers, have been investigated predominantly by neutron techniques. Rigidity of the backbones of both polymers affects their properties. For ionomers, it affects transport pathways, therefore, their applications for energy and separation membranes. In luminescent polymers, it determines the conformations of the chains and their electro-optical response. One group of the polymers consists of rigid hydrophobic para-phenylene backbone decorated with pendant phenyl side chains functionalized with sulfonic acid (SPP). The other family of polymers consists of poly para-phenyleneethynylene (PPE) backbone that becomes conjugated upon conformational …
Development And Evaluation Of Carbon-Based Quantum Dots For Carbon Dioxide Photoconversion, Sushant Sahu
Development And Evaluation Of Carbon-Based Quantum Dots For Carbon Dioxide Photoconversion, Sushant Sahu
All Dissertations
World energy consumption has increasingly grown over the past several decades.Because of its potential in photochemical energy conversion, photocatalysis has been the subject of much recent research. Recently, carbon or graphene-based quantum dots have attracted growing attention in solar energy conversion applications, because of its unique optoelectronic properties, broad-band optical absorption, bright fluorescence emissions, favorable photoinduced electron transfer properties, reliable chemical inertness and stability, cost-effectiveness, and non-toxicity. While nanosized wide band gap semiconductor-based systems were largely at the center of attention in such studies, carbon-based quantum dots have recently emerged as a new class of semiconductor like photoactive materials, due …
Cnt Welding Through Ar Bombardment Using Airebo Potential And Optimization Of An Extensionded Aireo Potential For F Atom To Simulate Hydrofluorocarbons, Mustafa Kucukkal
Cnt Welding Through Ar Bombardment Using Airebo Potential And Optimization Of An Extensionded Aireo Potential For F Atom To Simulate Hydrofluorocarbons, Mustafa Kucukkal
All Dissertations
ABSTRACT Molecular Dynamics (MD) is an effective method to study diverse systems to gain atomistic level details from the trajectories of particles in the system. MD require a potential which describes the interaction of the particles within the system, which is then used to solve Newton's equation of motion to obtain the trajectories of the particles. For an accurate simulation of a system, an appropriate potential should be used for the MD simulations. The Adaptive Interactive Reactive Empirical Bond Order (AIREBO) potential is a promising potential for MD simulations of systems involving bond breakage or formation [1, 2]. The AIREBO …
Passivation And Functionalization Of Conjugated Polymer Nanoparticles With Head Group Modified Phospholipids And Proteins, Prakash Kandel
Passivation And Functionalization Of Conjugated Polymer Nanoparticles With Head Group Modified Phospholipids And Proteins, Prakash Kandel
All Dissertations
Conjugated polymer nanoparticles (CPNs) possess important characteristics such as high fluorescence brightness, reasonable photostability, and non-toxicity. These properties allow the use of CPNs in fluorescence based cellular and biological applications including cellular labeling, imaging, biosensing, and single particle tracking. To realize the broad applications of CPNs, it is required that CPNs possess functionality to conjugate a recognition moiety and maintain colloidal stability in biological media. In the following Dissertation, we have prepared functionalized CPNs by surface passivation with head group- functionalized poly (ethylene glycol) lipids and proteins. We studied the colloidal stability of CPNs in biological media and investigated their …
Assessing College Students' Understanding Of Acid Base Chemistry Concepts, Yanjun Wan
Assessing College Students' Understanding Of Acid Base Chemistry Concepts, Yanjun Wan
All Dissertations
Typically most college curricula include three acid base models: Arrhenius', Bronsted-Lowry's, and Lewis'. Although Lewis' acid base model is generally thought to be the most sophisticated among these three models, and can be further applied in reaction mechanisms, most general chemistry curricula either do not include Lewis' acid base model, or quickly mention it at the end of the acid base chapter, because of the concern that Lewis' model may confuse general chemistry students (Shaffer 2006). While such a disconnection in curriculum might put students to disadvantage as they try to construct solid and coherent acid base mental models, there …
Miniaturization Of Chemical Analysis Tools: Micro-Solid Phase Extraction Tips For Protein Extractions And Development Of A Miniaturized Glow Discharge Source For Elemental Analysis, Benjamin Manard
All Dissertations
An increased interest has been placed on the miniaturization of chemical processes. Focus is placed on rapid chemical analysis, decreased operation cost, minimal generation of chemical waste, and reduced sample size. Presented here is an approached the goal of 'miniaturization' through two distinct areas of analytical chemistry: 1) employing capillary-channeled polymer (C-CP) fibers as a stationary phase in micro-SPE (solid phase extraction) tips for the extraction of proteins from buffered solutions (i.e. biofluids) with analysis by mass spectrometry (MS) and 2) the development of the liquid sampling-atmospheric pressure glow discharge (LS-APGD) as an excitation source for elemental analysis. Determination of …
New Synthetic Methodologies For Chemo-, Stereo-, And Regioselective 1,4-Conjugate Additions Of Organometallic Reagents To Michael And Extended Michael Substrates And Alkene Halofunctionalization Reactions, Ramesh Dhakal
All Dissertations
The research discussed in this dissertation is focused on developing new synthetic methodologies for the construction of carbon-carbon and carbon-heteroatom bonds present in several natural products and synthetic intermediates employing organometallic reagents and/or organocatalytic procedure. The presence of rich functionality in the reactive synthons under study provides opportunities for studying a variety of reactions. Effecting a reaction in a regio- and stereoselective fashion is highly attractive as the resulting synthons can be used for the syntheses of larger molecules. We have explored unprecedented variation of Michael Initiated Ring Closure (MIRC) reactions for the syntheses of 1,2,3-trisubstituted cyclopropane derivatives, owing to …
Building Chemistry One Atom At A Time: An Investigation Of The Effects Of Two Curricula In Students' Understanding Of Covalent Bonding And Atomic Size, Barbara Bull
All Dissertations
Chemists have to rely on models to aid in the explanation of phenomena they experience. Instruction of atomic theory has been used as the introduction and primary model for many concepts in chemistry. Therefore, it is important for students to have a robust understanding of the different atomic models, their relationships and their limitations. Previous research has shown that students have alternative conceptions concerning their interpretation of atomic models, but there is less exploration into how students apply their understanding of atomic structure to other chemical concepts. Therefore, this research concentrated on the development of three Model Eliciting Activities to …