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High Temperature Synthesis And Characterization Of Reduced Polyoxometalate Salt-Inclusion Solids, Dino Sulejmanovic
High Temperature Synthesis And Characterization Of Reduced Polyoxometalate Salt-Inclusion Solids, Dino Sulejmanovic
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Herein, several new salt-inclusion solids (SISs) featuring electronically reduced Keggin polyoxometalate (POM) clusters were isolated for the first time using molten-salt high temperature (> 500 oC) synthetic method. These POM-based SISs are novel all-inorganic materials featuring an integrated lattice of ionic halide salt and covalent metal oxide clusters. Due to the weak interactions at the interface between these two chemically dissimilar lattices, these POM SISs are soluble in aqueous and polar solvents. While POM compounds are well-studied and are routinely synthesized in solution, the synthetic method presented in this dissertation yielded several POM solids with interesting structures and infrequently observed, …
Towards A Greater Understanding Of Hydrothermally Grown Garnets And Sesquioxide Crystals For Laser Applications, Cheryl Moore
Towards A Greater Understanding Of Hydrothermally Grown Garnets And Sesquioxide Crystals For Laser Applications, Cheryl Moore
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ABSTRACT The hydrothermal method of crystal growth offers many benefits over traditional melt-based techniques such as lower temperature requirements relieving detrimental high temperature effects such as stress fracturing and a closed-environment, which limits impurities. The continued study of this type of growth including hydrothermal epitaxy is crucial in our world of constant miniaturization. Presented in this thesis is the hydrothermal growth of crystals of LuAG and Lu2O3 doped with a variety of dopants. Their room-temperature and cryogenic absorption spectra are also presented. Much like Nature uses heat, pressure, water and a nutrient-rich feedstock we have used this hydrothermal technique to …
Tracking Anisotropic Optical Tracers To Study Biophysical Processes And Cytotoxicity, Khanh Van Nguyen
Tracking Anisotropic Optical Tracers To Study Biophysical Processes And Cytotoxicity, Khanh Van Nguyen
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We use anisotropic optical tracers (also called magnetically modulated optical nanoprobes – MagMOONs or MOONs for non-magnetic nanoprobes in this dissertation) to study biophysical processes such as enzyme-catalyzed cleavage through tissue, intracellular transport of these tracers and cytotoxicity based on this transport. The anisotropic optical properties cause these tracers to blink when rotating. This blinking is distinguishable from the background and can be tracked on a single-particle level in the absence of tissue, or for an ensemble average of tracers blinking through tissue. An alginate gel containing these tracers in the form of a thin film can be used as …
Bombardment Simulations And Intercalation Studies Of Carbon Materials, Charles Lowe
Bombardment Simulations And Intercalation Studies Of Carbon Materials, Charles Lowe
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Molecular bombardment experiments have led to the possibility of altering materials with properties not normally associated with those materials. Molecular bombardment leads to defect formation in the material, potentially creating a pore, depending on the material and bombarding molecule. Carbon allotropes, specifically graphite and graphene, make excellent candidates for molecular bombardment experimentation. Depending on the bombarding molecule and the kinetic energy associated with that molecule, the defects induced will be sufficient to create a pore in the graphene. The AIREBO potential is used to simulate a graphene bilayer being bombarded with a single Ar atom, or a fullerene molecule, to …
Production And Characterization Of Cut Resistant Acrylic/Copolyaramid Fibers Via Bicomponent Wet Spinning, Stephen Hipp
Production And Characterization Of Cut Resistant Acrylic/Copolyaramid Fibers Via Bicomponent Wet Spinning, Stephen Hipp
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A composite fiber system consisting of a sheath core bicomponent polymer fiber loaded with hard ceramic particles was developed and characterized for use in cut protective clothing. The core component was comprised of a copolyaramid in order to provide high base cut resistance. An acrylic-copolyaramid polymer blend was used for the sheath component to improve processability and provide potential benefits such as dyeability. Lastly, aluminum oxide particles were incorporated into the fiber core to deflect and deform the cutting edge, further improving cut resistance. A series of designed experiments was used to explore the effects of the wet spinning and …
Understanding How Synthetic Organic Chemistry Graduate Students Navigate Scifinder, Lindsey Whitfield Cain
Understanding How Synthetic Organic Chemistry Graduate Students Navigate Scifinder, Lindsey Whitfield Cain
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Students pursuing a Ph.D. degree are expected to contribute research to their field, for which the success depends, in part, on their ability to find, interpret, and use scholarly information from the primary literature. However, studies from the information sciences show that graduate students from a variety of fields, including the sciences, frequently struggle to comprehensively search their respective dissertation topics because of insufficient prior content knowledge and lack of guidance from their disciplinary community. This body of literature is consistent with the results of my previous research of chemistry graduate students’ laboratory decision-making processes. Specifically, that study showed their …
Development Of A Miniaturized Ambient Glow Discharge Ionization Source And Its Application In Elemental And Molecular Analysis, Xinyan Zhang
Development Of A Miniaturized Ambient Glow Discharge Ionization Source And Its Application In Elemental And Molecular Analysis, Xinyan Zhang
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Since the liquid sampling-atmospheric pressure glow discharge (LS-APGD) was first developed as an excitation source for atomic emission spectroscopy, it has been improved upon and demonstrated as an ionization source for elemental mass spectrometry, molecular mass spectrometry, and ambient desorption mass spectrometry. Multiple functions coming from one package allowed the LS-APGD to hold a unique position among all atmospheric pressure glow discharges. It also has the capabilities to work with different sample forms including liquids, bulk solids, and solution residues. The high salt/matrix tolerance reduces sample prep work and thus provides convenience for its potential use as a field-Based ionization …
Ph Sensing And Imaging With Nanoparticles And Implantable Films, Fenglin Wang
Ph Sensing And Imaging With Nanoparticles And Implantable Films, Fenglin Wang
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pH is a very important parameter in biological systems. Monitoring pH in situ may provide useful information for studying pH regulated cellular events, diagnosing diseases and assessing treatment efficacy. Various strategies have been introduced for developing pH sensors. However, it is still challenging to monitor pH in biological systems with high specificity, especially through thick tissue. In this dissertation, we describe three types of pH sensors which are used to noninvasively monitor pH in living cells, monitor and map bacterial growth caused pH variation through thick tissue with minimal autofluorescence background. In Chapter 2, a pH nanosensor with high specificity …