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Articles 1 - 26 of 26
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Studies On The Preparation And Luminescence Properties Of Cadmium Selenide Quantum Dots, Their Immobilization, And Applications., Travis Justin Heath
Studies On The Preparation And Luminescence Properties Of Cadmium Selenide Quantum Dots, Their Immobilization, And Applications., Travis Justin Heath
Electronic Theses and Dissertations
Quantum dots are semiconductive particles whose properties are highly influenced by the presence of at least one electron. Cadmium selenide quantum dots were synthesized via colloidal synthesis. Contrary to previous preparations, more focus was placed on the temperature rather than the duration of time at which they form. A series of colored solutions were obtained because the excited quantum dots of various sizes emitted specific wavelengths of light. The emission spectra showed that the temperature-dependent quantum dots were successfully synthesized. The quantum dots were also immobilized on various surfaces, and the luminescence properties were examined. The quantum dots that were …
Development And Characterization Of Novel Sub-Coatings With Polymorphic Brookite Titania Nanoparticles: Enhanced Uv/Vis Photocatalytic Antibacterial And Anticancer Properties, Donna Weinbrenner
All Dissertations
ABSTRACT
Nosocomial and community infections and biofilm formation from bacteria has increased significantly through adaptation combined with overuse of broad spectrum antibiotics. Because the world population continues to escalate, hospitals and long-term managed care will also escalate, thereby increasing transmission of infections, lowering patients' quality of health. Another disease on the rise throughout the world is skin cancer. A treatment modality that would cause less deleterious effects on the patient would be ideal. These two seemingly different issues could be solved with one product. First an inexpensive, safe, and non-selective antimicrobial surface coating would enhance the hospital arena and a …
Efficient Separation And Sensitive Detection Of Listeria Monocytogenes Using Magnetic Nanoparticles, Microfluidics And Interdigitated Microelectrode Based Impedance Immunosensor, Damira Ashimkhanovna Kanayeva
Efficient Separation And Sensitive Detection Of Listeria Monocytogenes Using Magnetic Nanoparticles, Microfluidics And Interdigitated Microelectrode Based Impedance Immunosensor, Damira Ashimkhanovna Kanayeva
Graduate Theses and Dissertations
Listeria monocytogenes continues to be a major foodborne pathogen that causes food poisoning and sometimes death in immunosuppressed people and abortion in pregnant women. Nanoparticles have recently drawn attentions for use in immunomagnetic separation techniques due to their greater surface area/volume ratio and better stability against sedimentation in the absence of a magnetic field. Interdigitated microelectrodes and microfluidics make material transfer more efficient and biological/chemical interaction between the surface and solution phase much quicker. Magnetic nanoparticles (Fe3O4) with a 30 nm diameter were functionalized with rabbit anti-L. monocytogenes antibodies via biotin-streptavidin bonds and then amalgamated with target bacterial cells …
Size And Composition Dependent Electrochemical Oxidation And Deposition Of Metal Nanostructures., Olga S. Ivanova
Size And Composition Dependent Electrochemical Oxidation And Deposition Of Metal Nanostructures., Olga S. Ivanova
Electronic Theses and Dissertations
This dissertation describes (1) size-dependent electrochemical oxidation/stripping of gold and silver nanoparticles (NPs), (2) alloying of copper with gold nanoparticles at underpotential deposition potentials, (3) electrochemical characterization of Au/Ag core-shell structures, (4) characterization of metal nanoparticle alloys by stripping voltammetry, and (5) layer-by-layer assembly of metal nanoparticle/polymer structures. The motivation of this work is to better understand fundamental properties of metal nanostructures as a function of size, shape, and composition. We synthesized Au and Ag NPs with different size by electrochemical reduction of the metal salt directly on the electrode surface and by seed-mediated growth in solution followed by chemisorption …
Synthesis And Characterization Of An Europium-Porphyrin Complex, Alejandro Blinder
Synthesis And Characterization Of An Europium-Porphyrin Complex, Alejandro Blinder
All Capstone Projects
Photodynamic therapy (PDT) is a promising treatment that has continued to improve over the past thirty years when the first commercially approved photosensitizer (PS) was introduced. Although PDT has many successful applications, the terrifying number of new cancer cases reported each year makes scientists focus their efforts towards the development of new efficient PS for PDT. The biggest obstacle that prohibits PDT from becoming a more widely used therapy is the ineffective photosensitizers (PS) that are available on the market today. The purpose of this study was to evaluate the synthesized metal-porphyrin complex as a possible candidate as a PS. …
Providing A Theoretical Basis For Nanotoxicity Risk Analysis Departing From Traditional Physiologically-Based Pharmacokinetic (Pbpk) Modeling, Dirk P. Yamamoto
Providing A Theoretical Basis For Nanotoxicity Risk Analysis Departing From Traditional Physiologically-Based Pharmacokinetic (Pbpk) Modeling, Dirk P. Yamamoto
Theses and Dissertations
The same novel properties of engineered nanoparticles that make them attractive may also present unique exposure risks. But, the traditional physiologically-based pharmacokinetic (PBPK) modeling assumption of instantaneous equilibration likely does not apply to nanoparticles. This simulation-based research begins with development of a model that includes diffusion, active transport, and carrier mediated transport. An eigenvalue analysis methodology was developed to examine model behavior to focus future research. Simulations using the physicochemical properties of size, shape, surface coating, and surface charge were performed and an equation was determined which estimates area under the curve for arterial blood concentration, which is a surrogate …
Nanoparticle Use In The Modulation Of Transplant Rejection In A Murine Model, Elias Noah Kassis
Nanoparticle Use In The Modulation Of Transplant Rejection In A Murine Model, Elias Noah Kassis
Yale Medicine Thesis Digital Library
Solid organ transplant has emerged over the last half century as an important treatment for solid organ failure. Management has matured dramatically over the past two decades with improvements in acute rejection, but long-term graft survival has improved very little and current treatment is limited by the side-effects and toxicities of immunosuppressive medications. Nanoparticle delivery of therapeutics, improving transport characteristics and decreasing systemic and local toxicity has emerged as a dynamic treatment modality, but little work has been done using nanoparticles in transplantation. Our research examined the use of CD4-targeted nanoparticles encapsulated with mycophenolic acid (MPA), a commonly used immunosuppressant …
Self-Assembly Of Nanoparticles At Liquid-Liquid Interfaces, Kan Du
Self-Assembly Of Nanoparticles At Liquid-Liquid Interfaces, Kan Du
Open Access Dissertations
In this thesis, we studied the self-assembly of nanoparticles at liquid metal-water interfaces and oil-water interfaces. We demonstrated a simple approach to form nanostructured electronic devices by self-assembly of nanoparticles at liquid metal surfaces. In this approach, two liquid-metal droplets, which were coated with a monolayer of ligand-stabilized nanoparticles, were brought into contact. They did not coalesce but instead remained separated by the nanoparticles assembled at the interface. Devices formed by this method showed electron transport between droplets that was characteristic of the Coulomb blockade, where current was suppressed below a tunable threshold voltage because of the energy of charging …
The Electrochemical Synthesis, Chemical Synthesis, And Galvanic Exchange Of Silver Nanostructures Directly On Surfaces., Grzegorz W. Slawinski
The Electrochemical Synthesis, Chemical Synthesis, And Galvanic Exchange Of Silver Nanostructures Directly On Surfaces., Grzegorz W. Slawinski
Electronic Theses and Dissertations
This dissertation describes galvanic exchange of silver (Ag) nanostructures with PdCl42- in 1) various PdCl42- concentrations, 2) the presence of 0.1 M cetyitrimethylammonium bromide (CTAB), and 3) the presence of 0.1 M potassium bromide (KBr). It also describes the electrochemical seed-mediated growth of Ag nanorods directly on indium tin oxide (ITO) coated glass electrodes, and the synthesis of Ag nanostructures directly on thin sheets of graphene and the Raman enhancement of the graphene. Ag nanorods (NRs) and nanowires (NWs) synthesized directly on surfaces from surface-attached Au nanoparticles (NPs) by seed-mediated growth react spontaneously with PdC142- solutions by galvanic exchange. The …
The Localized Surface Plasmon Resonance (Lspr) Response Of Gold And Gold/Silver Metal Nanostructures To Protein Binding And Global Refractive Index Changes., Srinivas R. Beeram
The Localized Surface Plasmon Resonance (Lspr) Response Of Gold And Gold/Silver Metal Nanostructures To Protein Binding And Global Refractive Index Changes., Srinivas R. Beeram
Electronic Theses and Dissertations
This dissertation describes new procedures for synthesizing and purifying Au and Au/Ag nanoplates directly on surfaces as well as controlled binding of proteins to their surface. It also describes fundamental changes in the optical properties of Au and Au/Ag nanoplates upon interaction with different liquids, proteins, or nanoparticles. Finally, this dissertation describes the highly selective and sensitive label-free detection of proteins in an immunoassay format using the optical properties of Au and Au/Ag nanostructures. A chemical seed-mediated growth procedure allowed the synthesis of Au nanoplates directly on surfaces with an initial 23% yield. Purification by either sonication or adhesive tape …
Fabrication Of Fluorescent Nanoparticle-Polymer Composites For Photoactive-Based Materials, Brett Ellerbrock
Fabrication Of Fluorescent Nanoparticle-Polymer Composites For Photoactive-Based Materials, Brett Ellerbrock
All Theses
Nanocomposites of nanoparticles dispersed throughout a polymer matrix have been studied to great length to improve the overall polymer properties. These enhancements are observed in the thermal, physical, and/or optical characteristics. Being able to harness nanoparticles in such a way may help improve fiber technology into the 21st century.
This work was geared toward synthesizing rare earth doped lanthanum fluoride (LaF3) nanoparticles because good separation in the absorption and emission bands of the material and it fluoresces in the visible to near-infrared range. Terbium ions were added to a LaF3 crystal because of their distinct visible green …
Core-Shell Nanoparticles: Synthesis, Design, And Characterization, Kyler Carroll
Core-Shell Nanoparticles: Synthesis, Design, And Characterization, Kyler Carroll
Theses and Dissertations
The design of core/shell nanoparticles is of great interest for a wide range of applications. The primary focus of this dissertation is on the design and optimization of two synthetic routes. The first one is an aqueous reduction method using sodium borohydride and sodium citrate. This method was extended to design two types of core/shell nanoparticles, both of which have many applications in bio-sensing, magnetic resonance imaging, and magnetically guided SERS for the identification of environmental threats. The first, Fe/Ag core/shell nanoparticles were designed using a novel one-pot method by varying the AgNO3 addition time in the system. For …
The Sintering And Stability Of Catalytic Nano-Particles, Andrew Delariva
The Sintering And Stability Of Catalytic Nano-Particles, Andrew Delariva
Chemical and Biological Engineering ETDs
Studies were performed on three different catalysts in order to determine their stability and sintering behavior. Pd deposited on a flat single crystal substrate made of Al2O3 was characterized to determine if the mechanism of Ostwald ripening was solely dominated by vapor phase transport of metal atoms. The atoms emitted could be determined by the rate of evaporation and an attempt was then made in order to relate the rates of emission to sintering (instability of nanoparticles). It was found that the rates of emission did not fully reflect vapor phase transport (direct evaporation). The particle-support interaction was increasing the …
Luminescent Quantum Dot And Protein Composite Nanoparticles For Bioanalytical Applications, Arriel Wicks
Luminescent Quantum Dot And Protein Composite Nanoparticles For Bioanalytical Applications, Arriel Wicks
University of New Orleans Theses and Dissertations
The first project focused on the preparation, characterization, and application of dual emission quantum dot encoded mesoporous silica microparticles. The quantum dots were added in precisely controlled ratios and were stably encapsulated within the pores of the silica. Several experiments were performed to test the superior stability of the quantum dot-silica composites over dye-loaded silica particles. The composite particles exhibited very high fluorescence, were functionalized with antibodies, and were used as signal transducers for the detection of a protein expressed by breast cancer cells. The second project focused in more detail on the detection capabilities of the quantum dot-silica composites. …
Theoretical Investigation Of The Structures And Stability Of Gas Phase Neutral And Cationic Tixoy Clusters., Baljeet Kaur
Theoretical Investigation Of The Structures And Stability Of Gas Phase Neutral And Cationic Tixoy Clusters., Baljeet Kaur
Theses and Dissertations
Theoretical investigation of the structure and stability of neutral and cationic TixOy cluster series (where y =2x-1, 2x, 2x+1) have been performed. The lowest lying structures for the neutral clusters are usually found in the singlet state. Generally, in bulk and in the case of the neutral TixOy clusters, the 2x cluster series is relatively more abundant than the 2x-1 and the 2x+1 cluster series. But in the case of cationic TixOy clusters, the 2x-1 series is more abundant. To understand the origin of the stability of the TixO2x-1+ clusters, we use density functional theory within the NRLMOL set of …
Fabrication And Characterization Of Surfactant-Free Pbse Quantum Dot Films And Pbse-Polymer Hybrid Structures, Gayan S. Dedigamuwa
Fabrication And Characterization Of Surfactant-Free Pbse Quantum Dot Films And Pbse-Polymer Hybrid Structures, Gayan S. Dedigamuwa
USF Tampa Graduate Theses and Dissertations
This work describes an experimental investigation of methods of synthesis, determination of structural and physical properties, and analysis and correlation of the properties to the structures of semiconductor quantum dots and quantum dot-polymer hybrid structures. These structures are investigated for applications in flexible solar cell devices. The main synthesis process used in the work was a Laser-Assisted Spray (LAS) process that was developed in our laboratory to deposit surfactant-free PbSe quantum dot (QD) films directly on a substrate. The QD films formed by this technique are in close contact with each other forming a percolation path for charge transport. Analytical …
Synthesis, Structure, And Catalytic Properties Of Size-Selected Platinum Nanoparticles, Simon Armando Covone
Synthesis, Structure, And Catalytic Properties Of Size-Selected Platinum Nanoparticles, Simon Armando Covone
Electronic Theses and Dissertations
The use of heterogeneous catalysis is well established in chemical synthesis, energy, and environmental engineering applications. Supported Pt nanoparticles have been widely reported to act as catalysts in a vast number of chemical reactions. In this report, the performance of Pt/ZrO2 nanocatalyst for the decomposition of methanol, ethanol, 2-propanol, and 2-butanol is investigated. The potential of each alcohol for the production of H2 and other relevant products in the presence of a catalyst is studied. All the alcohols studied show some decomposition activity below 200°C which increased with increasing temperature. In all cases, high selectivity towards H2 formation is observed. …
Magnetic Nanosensors For Multiplexed Bacterial Pathogenesis Identification, Charalambos Kaittanis
Magnetic Nanosensors For Multiplexed Bacterial Pathogenesis Identification, Charalambos Kaittanis
Electronic Theses and Dissertations
Developing diagnostic modalities that utilize nanomaterials and miniaturized detectors can have an impact in point-of-care diagnostics. Diagnostic systems that (i) are sensitive, robust, and portable, (ii) allow detection in clinical samples, (iii) require minimal sample preparation yielding results quickly, and (iv) can simultaneously quantify multiple targets, would have a great potential in biomedical research and public healthcare. Bacterial infections still cause pathogenesis throughout the world (Chapter I). The emergence of multi-drug resistant strains, the potential appearance of bacterial pandemics, the increased occurrence of bacterial nosocomial infections, the wide-scale food poisoning incidents and the use of bacteria in biowarfare highlight the …
Plasmon Enhanced Near-Field Interactions In Surface Coupled Nanoparticle Arrays For Integrated Nanophotonic Devices, Amitabh Ghoshal
Plasmon Enhanced Near-Field Interactions In Surface Coupled Nanoparticle Arrays For Integrated Nanophotonic Devices, Amitabh Ghoshal
Electronic Theses and Dissertations
The current thrust towards developing silicon compatible integrated nanophotonic devices is driven by need to overcome critical challenges in electronic circuit technology related to information bandwidth and thermal management. Surface plasmon nanophotonics represents a hybrid technology at the interface of optics and electronics that could address several of the existing challenges. Surface plasmons are electronic charge density waves that can occur at a metal-dielectric interface at optical and infrared frequencies. Numerous plasmon based integrated optical devices such as waveguides, splitters, resonators and multimode interference devices have been developed, however no standard integrated device for coupling light into nanoscale optical circuits …
Supported Mono And Bimetallic Platinum And Iron Nanoparticles Electronic, Structural, Catalytic, And Vibrational Properties, Jason Robert Croy
Supported Mono And Bimetallic Platinum And Iron Nanoparticles Electronic, Structural, Catalytic, And Vibrational Properties, Jason Robert Croy
Electronic Theses and Dissertations
Catalysis technologies are among the most important in the modern world. They are instrumental in the realization of a variety of products and processes including chemicals, polymers, foods, pharmaceuticals, fuels, and fuel cells. As such, interest in the catalysts that drive these processes is ongoing, and basic research has led to significant advances in the field, including the production of more environmentally friendly catalysts that can be tuned at the molecular/atomic level. However, there are many factors which influence the performance of a catalyst and many unanswered questions still remain. The first part of this work is concerned with the …
Effects Of Silver Nanoparticles On Photochemical Processes Focusing On Luminol Chemiluminescence, Scott Milam
Effects Of Silver Nanoparticles On Photochemical Processes Focusing On Luminol Chemiluminescence, Scott Milam
Master's Theses and Doctoral Dissertations
Silver nanoparticles of varying sizes were synthesized. Their effects on enhancing or quenching the photochemical processes of tryptophan fluorescence, a ruthenium complex decay constant and chemiluminescence of luminol and ferricyanide, were studied. The tryptophan fluorescence was slightly enhanced by smaller nanoparticles and showed slight quenching in the presence of larger nanoparticles. The tris (2,2’-bipyridyl ruthenium (II) chloride) complex was excited using a 532 nm laser, and the decay constant was measured. Neither gold nor silver nanoparticles showed an impact on this process. The luminol chemiluminescence was studied with an emphasis on holding the concentration of nanoparticles, surface area, and silver …
Prediction Of Optical Properties Of Plasmonic Composites: Applications To Solar Energy Harvesting, Satvik Wani
Prediction Of Optical Properties Of Plasmonic Composites: Applications To Solar Energy Harvesting, Satvik Wani
All Theses and Dissertations (ETDs)
The finite difference time domain method was used to simulate the optical response of plasmonic composites with one and two nanoscale spherical metallic inclusion(s): Ag/Cu in Air/SiO2) with various diameters and compositions. Fair agreement was found between simulation and effective medium theories for binary and ternary composites. Responses of ternary Ag/Cu/SiO2 composites with various Ag:Cu ratios were found to be in fair agreement with the experimental data obtained from literature. Experiments with photosynthetic microalga Chlamydomonas Reinhardtii and Cyanothece showed that the wavelength specific backscattering in the blue region of the spectrum from an Ag nanoparticle suspension could promote microalgal growth …
Electrospray Methodologies For Characterization And Deposition Of Nanoparticles, Luis Balam Modesto Lopez
Electrospray Methodologies For Characterization And Deposition Of Nanoparticles, Luis Balam Modesto Lopez
All Theses and Dissertations (ETDs)
Electrospray is an aerosolization method that generates highly charged droplets from solutions or suspensions and, after a series of solvent evaporation - droplet fission cycles, it results in particles carrying multiple charges. Highly charged particles are used in a variety of applications, including particle characterization, thin film deposition, nanopatterning, and inhalation studies among several others. In this work, a soft X-ray photoionization was coupled with an electrospray to obtain monodisperse, singly charged nanoparticles for applications in online size characterization with electrical mobility analysis. Photoionization with the soft X-ray charger enhanced the diffusion neutralization rate of the highly charged bacteriophages, proteins, …
Itraconazole Loaded Poly (Lactic-Co-Glycolic) Acid Nanoparticles For Improved Antifungal Activity, Nipur Rajan Patel
Itraconazole Loaded Poly (Lactic-Co-Glycolic) Acid Nanoparticles For Improved Antifungal Activity, Nipur Rajan Patel
LSU Master's Theses
PLGA (polylactic-co-glycolic acid) nanoparticles containing the hydrophobic antifungal Itraconazole (ITZ) were developed to address the need for more efficient means of treating fungal infections. PLGA-ITZ nanoparticles were synthesized using an oil-in-water emulsion evaporation method. The nanoparticles morphology (TEM), size and size distribution, zeta potential (DLS), encapsulation efficiency (UV-VIS), release profile, and antifungal activity were characterized. The blank NPs and loaded PLGA-ITZ NPs were spherical with diameters of 201±5 nm, 232±1 nm and 223±36 nm at 0%, 12.5% and 25% loadings, respectively. All synthesized particles measured a negative zeta potential ranging from -28 to -33 mV. The maximum encapsulation efficiency of …
Antisense Silver Nanoparticles For Photo-Activated Gene Silencing, Paige Kathleen Brown
Antisense Silver Nanoparticles For Photo-Activated Gene Silencing, Paige Kathleen Brown
LSU Master's Theses
The unique properties of noble metal nanoparticles, which include tunable electronic and photonic characteristics, contribute to their potential as novel delivery vectors with enhanced drug stability, cell uptake, and photo-activated functionalities. Silver, as one of best surface-enhancing substrates available for bulk nanostructure synthesis, is a prime choice for investigations of metal nanohybrids as antisense therapy vehicles with special surface plasmon resonance (SPR) enabled functional attributes. The singular photonic properties of silver nanoparticles (SNPs) may contribute to ease of delivery confirmation and in situ photo-activation of protected cargo packed on particle surfaces. Here we show the synthesis and characterization of 40-80nm …
Interfacial Nitrone 1,3-Dipolar Cycloadditions For Modification Of Monolayer Protected Gold Nanoparticles, Brandon M. Lines
Interfacial Nitrone 1,3-Dipolar Cycloadditions For Modification Of Monolayer Protected Gold Nanoparticles, Brandon M. Lines
Digitized Theses
The ability to manipulate the interfacial environment of monolayer protected gold nanoparticles (MPNs) is critical for the understanding and development in their potential application. While various methods for the incorporation of functionality onto MPNs are available, many require tedious synthesis dependant solely upon its application. A result of this is the development of a multifunctional MPN that can serve as a platform and has the potential to undergo multiple organic transformations at the interface, offering a powerful tool in the exploitation of the MPNs unique chemical environment. This thesis looks to examine the use of a maleimide modified-MPN as a …