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 87 for “"nanospheres"”.
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Deciphering optical properties of hollow gold nanospheres
Hollow gold nanospheres (HGNs) demonstrate a tunable localised surface plasmon resonance ranged from the visible to near infrared (NIR) which is of significant importance for bioimaging due to the better penetration depth and reduced autofluorescence. They consist of high quality nanoshells with a …
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Semiconducting Polymer Nanospheres: Organic Alternatives to Inorganic Quantum Dots?
Semiconducting polymer nanospheres are organic conjugated polymer nanoparticles which are synthesized from benign materials and exhibit excellent fluorescence properties. The nanoparticles are generally larger than inorganic quantum dots with a relatively broad size distribution. Quantum dots, on …
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Synthesis and Characterization of Surface-Functionalized Magnetic Polylactide Nanospheres
… were further incorporated into controlled-size nanospheres. The complexes were blended with poly(ethylene oxide-b-D,L-lactide) diblock copolymers to introduce hydrophilicity on the surface of the nanospheres with tailored functionality. Self-assembly of the PEO block to the surface of the …
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Ultrasensitive Force Sensing with Nanospheres in an Optical Standing Wave Trap
This thesis details the experimental progress developing a state-of-the-art neutral force sensor using an optically levitated nano-sphere. Trapping 300 nm diameter fused silica spheres using a dual beam optical standing wave trap, we have experimentally reported a force sensitivity of 1.63 …
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A STUDY OF CERTAIN ELECTROMAGNETIC INTERACTIONS AMONG HIGH OPTICAL CONDUCTIVITY NANOSPHERES AND DIELECTRIC HALF-SPACES
<p>Electromagnetic coupling between a sphere and a semi-infinite substrate, and among several spheres present in the form of a composite were studied in this dissertation. Specifically, spheres made of noble metals such as Ag, Au and Cu and relatively high refractive index substrates and composite …
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The fabrication of biodegradable nanospheres from novel hydroxalkanoates for the delivery of actives of pharmaceutical and agricultural interest
This work describes the fabrication of nanospheres from a range of novel polyhydroxyalkanoates supplied by Monsanto, St Louis, Missouri, USA for the delivery of selected actives of both pharmaceutical and agricultural interest. Initial evaluation of established microsphere and nanosphere …
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Improving Bioactivity and the Anti-Bacterial Properties of Two-Solution Bone Cement Containing Cross-Linked Polymethylmethacrylate (PMMA) Nanospheres (η-TSBC)
… cross-linked polymethylmethacrylate (PMMA) nanospheres (η-TSBC), as part of the polymer phase, were fabricated as the first step for optimization of cement viscosity for application of the material in the treatment of vertebral compression fractures using vertebroplasty (VP) and kyphoplasty …
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Synthesis of self-assembled polystyrene nanospheres/cadmium metal nanoparticles (PSNs/CdMNPs) composite thin film for its application as adsorbent and catalyst
… and physicochemical properties of polystyrene nanospheres/cadmium metal nanoparticles (PSNs/CdMNPs) composite thin film with its adsorption and catalytic properties. The PSNs/CdMNPs composites were fabricated on a hydrophilic silicon wafer through self-assembly process from its aqueous …
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Chemical Tagging of Surface Composition Gradients With Polystyrene Nanospheres and the Extracellular Matrix Protein Fibronectin for the Study of Cellular Migration
… stabilizer to covalently bind polystyrene nanospheres and the protein fibronectin (FN) to thiol gradient surfaces. Fluorescently doped, carboxylic acid-modified nanospheres were reacted with gradients of an amine-terminated thiol. Surface nanosphere distribution was probed with fluorescence …
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Luminescent Semiconductor Quantum Dots (QDs) and Their Nanoassemblies as Bioprobes
… as ions probes and methods to encapsulate QDs in nanospheres including micelles, glyconanospheres and silica nanospheres and the use of these nanospheres in bioassays are described. CdS QDs capped with different ligands such as thioglycerol, cysteine and polyphosphate showed different responses to …
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Analysis of the single scatter albedo and imaginary index of refraction of fused silica nanospheres via a photoacoustic technique and a novel aerosol generator
This experiment sought to study the single scatter albedo (SSA) and imaginary index of refraction of 300nm fused silica spheres using the in-situ technique of photoacoustic spectroscopy. Through the use of a novel aerosol generator, sample aerosol streams were generated and sampled via a 4 …
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Preparation and Characterization of Carbohydrate-Functionalized Nanomaterials for Use as Cellular Probes and Targeted Delivery Vehicles
… of carbohydrate-functionalized gold nanospheres and surfactant vesicles. A variety of N-linked glycoconjugates tethered to thiols, siloxanes, and hydrocarbons were synthesized via modified Staudinger methodology with a high stereoselectivity. The stereochemistry at the anomeric center …
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Plasmon Directed Chemical Reactivity and Nanoparticle Self-Assembly
… the plasmonically directed self-assembly of gold nanospheres onto both silver nanospheroids and gold nanorods. At the heart of this research is a the use of a photocleavable ligand (1-(6-Nitrobenzo[d][1,3]dioxol-5-yl)ethyl(4-(1,2-Dithiolan-3-yl)butyl) carbamate), which is capable of forming a …
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Polymeric nanocapsules for pharmaceutical applications
… therapy. Nanoparticles can be divided into nanospheres and nanocapsules, accordingly to their structure. Nanospheres are constituted by just the polymer, while nanocapsules have an inner liquid core surrounded by a polymer layer. Drug can be incapsulated inside these structures. Amphiphilic …
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Acoustic mode quantization in nanostructures
… nanostructures, viz. silica and polystyrene nanospheres, hollow carbon microspheres, and GeO2 nanocubes. The confined acoustic modes observed show significantly different features from those of the corresponding bulk. Based on elasticity theory, the eigenfrequencies of these modes have been …
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Dye-doped polymer nanoparticles for flexible, bulk luminescent solar concentrators
… waveguide containing dye-aggregate polystyrene nanospheres that enable FRET at concentrations below that required for the bulk LSC due to dye confinement. In the aqueous state, the maximum achieved energy transfer efficiency of the dye-doped nanoparticles was found to be 8 7% for lwt%/lwt% …
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Development of Gold Nanocluster-Based Biosensors
… bands including monomers, small aggregates (2-4 nanospheres), and large aggregates (>5 nanospheres) can be separated via density gradient centrifugation. The isolated gold nanoclusters greatly enhance the Raman intensity of the trapped dye molecules such that single nanocluster detection is …
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Study of Charged Liquid Cluster Beam Generation and Application to Processing of Thin Films and Nanoparticles
… of thin films and nanoparticles. Silica nanospheres were fabricated using the CLCB technique. The median size of the resulting silica nanospheres was around 10 nm and the smallest size observed within the SEM resolution limit was 5 nm. Quantum wires of GaAs and silicon nanotips were …
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Biosynthesis of Poly-3-Hydroxybutyrate and its Application in Controlled Drug Delivery
… Particulate DDS such as microspheres and nanospheres have gained prominence in this context, and the optimisation of these to cater to the type of target, therapeutic agent to be encapsulated and the mode of delivery is a growing need. Polyhydroxyalkanoates (PHAs) are a class of natural …
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Synthesis, Characterization, and Evaluation of Silica-Nanosphere-Based Contrast Agents for Biomedical Application
… were ultimately introduced into the silica nanospheres for dual functionality. Gd-DTPA, a commonly used MRI contrast agent, was chosen as an appropriate candidate for initial study. Through an in vivo experiment using tadpoles, we demonstrated and evaluated dual functionality of Gd-DTPA …
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