Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"nanoshells"”.
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Plasmonic Nanoshells: Synthesis, Functionalization, and Photonic Applications
… and application of hollow gold-silver nanoshells (GS-NSs). GS-NSs were chosen for this research because of their unique surface plasmon resonance properties, allowing for these nanostructures to be designed to absorb light at wavelengths from the visible to the near-infrared. Initial …
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Nanoshells in vivo imaging using two-photon excitation microscopy
… characterization of near infrared (NIR) gold nanoshells for the use as luminescent contrast agents for applications in small animal blood vessel imaging. Two types of gold-silica nanoshells excitable by NIR lasers are investigated: Type 1 nanoshells can be excited with a sub-mum NW laser, …
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Gold Nanoshells: Synthesis and Applications to In Situ SERS
In situ surface-enhanced Raman spectroscopy (SERS) is a powerful technique for probing molecular adsorption and reaction at the solid-liquid interface due to its very high surface sensitivity, wide applicable frequency range, and relative insensitivity to water. However, a low SERS activity and …
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Gold nanoshells for surface enhanced Raman spectroscopy and drug delivery
Gold nanoshells are tunable plasmonic nanostructures consisting of spherical silica cores wrapped with thin layer of Au. Based on the size of the Au layer with respect to the silica core, gold nanoshells can resonantly absorb or scatter light at any wavelength on the visible or infrared. On …
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Engineering the Plasmon Resonance of Gold Nanoshells for Biological Applications
… to the optimization of the process by which gold nanoshells are formed. With a focus on nanoshells for the thermal ablation of cancer cells, 104.5 nm core shell particles having a peak resonance at 940 nm were formed. The study also presents two new methods by which ‘textured’ nanoshells may be …
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Investigation into the molar feeding ratio and temperature dependence on the replacement reaction between platinum ions and silver nanoparticles
… At low levels of supplied platinum, the nanoshells were only partially formed, but at a 1:1 molar ratio, non-uniform thickness nanoshells were formed with large amounts of silver on the surface. The temperature dependence showed increasingly thick shell formation; however, cyclic …
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Poly(NIPAAm-co-AAm)-gold nanoshell composites for optically-triggered cancer therapeutic delivery
… (NIPAAm-co-AAm) hydrogel and gold-silica nanoshells. Thermally responsive hydrogels undergo a physical property transition at their lower critical solution temperature (LCST). When transitioning from below to above the LCST, the hydrogel material expels large amounts of water and absorbed …
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Spatially-resolved reflectance spectroscopy with variable fiber geometry
… angled fiber geometry may be coupled with gold nanoshells to provide significantly enhanced scattering contrast when nanoshells are selectively conjugated with dysplastic epithelial tissue. An equal magnitude of scattering contrast can be induced with markedly less gold nanoshell dosage when the …
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Applications of Ephb4 Receptor Specific Peptides In Targeted Cancer Imaging and Therapy
… receptor specific peptide conjugated hollow gold nanoshells (HAuNS) into tumors has great potential in cancer imaging and photothermal therapy. In this study, we developed an EphB4 specific peptide named TNYL-RAW and labeled with radioisotope <sup>64</sup>Cu and Cy5.5 dye. We also conjugate this …
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Complex Plasmonic Nanostructures: Symmetry Breaking and Coupled Systems
… The plasmon modes of a dimer consisting of two nanoshells are investigated in both the separated and conductively overlapping regimes and are interpreted using the plasmon hybridization model. Next, coupled nanoclusters of seven particles arranged in a hexagonal pattern are studied. It is found …
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Thermally-responsive interpenetrating polymer network nanoparticles as intelligent therapeutic systems
… (diameter ~ 40-50 nm) as well as gold nanoshells (diameter ~ 200 nm) were also synthesized using standard citrate reduction and core-shell synthesis methods, respectively. These materials were shown to absorb light in the visible to near infrared region and converted that energy to heat …
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Infrared Energy Conversion in Plasmonic Fields at Two-Dimensional Semiconductors
… of up to 0.023% W-1. Capacitive coupling between nanoshells arranged into dimers further augmented SHG activity from MoS2. New theoretical and experimental insights into energy conversion interactions between coupled plasmonic and excitonic materials spanning the linear and nonlinear optical …
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Electron Energy Loss Spectroscopy and Optical Properties of Plasmonic Nanostructure
… charge plot. Later we also studied hollow Au Nanoshells: hollow Au-Ag Nanoshell and hollow Au-Co Nanoshell. The former showed the surprising in vivo instability in the near infrared region while the later has potential application in hot electron generation.
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Numerical Study of Plasmon Resonances in Nanoparticles
… and experimental data. Furthermore, metallic nanoshells for biosensing applications as well as nanoparticle-structured plasmonic waveguides of light are numerically investigated. The integral equation based numerical technique presented throughout this dissertation can be instrumental for the …
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Sulfur-Based Yolk-Shell Nanoparticles for Lithium Sulfur Batteries
… we provide a template to synthesize various TiO2 nanoshells. All of the targeted nanoparticles reported herein were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), …
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Deciphering optical properties of hollow gold nanospheres
… autofluorescence. They consist of high quality nanoshells with a small size and spherical shape. However, the reproducibility of the synthesis is an issue especially for HGNs with localised surface plasmon resonances (LSPRs) in the NIR region. Also the optical properties of these nanostructures …
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Bioengineering-enhanced neurosurgical solutions
… brain tumours. The use of hyaluronic acid nanoshells is proposed to encapsulate prodrugs and exploit the mechanisms of interaction between glioma cells and hyaluronic acid, a natural component of extracellular matrix. The theoretical advantages of this approach are discussed with details …
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Optoperforation of Intact Plant Cells, Spectral Characterization of Alloy Disorder in InAsP Alloy Disorder in InAsP Alloys, and Bimetallic Concentric Surfaces for Metal-Enhanced Fluorescence in Upconverting Nanocrystals
… were proposed that retrofit metallic nanoshells to these lanthanide-doped nanocrystals. The typical monometallic construction was rejected in favor of architectures featuring Au-Ag bimetallic concentric surfaces, a decision supported by the considerable overlap of the calculated …
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Development of Core-Shell Polymeric Nanostructures for Delivery of Diagnostic and Chemotherapeutic Agents
… were used to complex with cationic gentamicin in nanoshells of these complexes. The iron oxide particle core provides an imaging modality and serves as a pseudo-crosslinking site to enhance stabilities of the polyelectrolyte complexes, thus preventing them from disintegrating in the physiological …
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Shape-Engineering Substrate-Based Plasmonic Nanomaterials
… templates are chemically transformed into hollow nanoshells. Detailed studies are provided highlighting discoveries related to (i) hollowing, (ii) defect transfer, (iii) strain induction, (iv) interdiffusion, (v) crystal structure and (vi) the localized surface plasmon resonance (LSPR). The second …
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