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 13 of 13 for “"silica coating"”.
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Gold nanorod surface functionalization: construction of dynamic surfaces and heterogeneous silica coating
… of this thesis is to build up dynamic surface coatings on GNRs that change their thickness and reversibly responsible to specific outside stimuli. Poly (N-isopropylacrylamide) (PNIPAM), with lower critical solution temperature around 32°C in water, was chosen as the thermal responsive coating …
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Synthetic routes to silica-coated gold nanorods
… this thesis will focus on the synthesis of a silica coating on the surface of gold nanorods. First, work pioneered by Liz-Marzán in silica coating of gold nanorods via mPEG- SH coated rods followed by a silane will be explored. Next, alternate routes involving modified Stöber methods will be …
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Nonaqueous Synthesis of Metal Oxide Nanoparticles and Their Surface Coating
… some of these nanoparticles as the core with silica, titania or polymer as shell via a modified microemulsion approach. In the first part, the experimental procedures and characterization results of successful synthesis of crystalline iron oxide (Fe3O4) and indium oxide (In2O3) nanoparticles …
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Anisotropic surface functionalization and applications of upconversion nanoparticles
… interaction (insert), ligand exchange, and silica coating techniques are sufficient for their surface modification. In this thesis, the author explores the surface coverage at the nanoscale of a library of non-spherical rods, discs, and dumbbell structures of UCNPs, and demonstrates that …
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The Bio-Nano Interface: Investigating the Roles of Nanoparticle Morphology, Microstructure, Optoelectronic Properties, and Surface Chemistry for Biological Applications
… and night vision. Finally, I explored the silica coating of both QR and magnetic core/alloy FeNi and FeCr NPs. Silica coating is a surface modification tool which can greatly improve colloidal stability, render aqueous solubility, enhance and protect optical properties through surface …
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Surface modifications of iron oxide nanoparticles for biological applications
… of MPs, such as attaching silane groups and silica coating, lead to formation of more complex structures of superparamagnetic and fluorescent silica microspheres and nanostructures. These microspheres and nanostructures comprising MPs and semiconductor quantum dots (QDs) are useful tools for …
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The deposition of silica on titanium dioxide surfaces
The deposition of amorphous silica from aqueous solution on to rutile particles has been studied with the aim of elucidating the nature of the silica-titania interactions occurring and of following the progressive build up of the silica coating. The coating process, which involves the addition of …
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Harnessing the optical properties of gold nanorods: fluorescence enhancement, biosensing and photothermal therapy
… chapter, gold nanorods are prepared, the surface coating is modified, and the materials are characterized by a variety of methods. This thesis seeks to demonstrate how these materials may be useful, with a focus on three particular applications: fluorescence enhancement, biosensing and …
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Plasmonic Nanoshells: Synthesis, Functionalization, and Photonic Applications
… studies utilizing these nanoshell cores included coating the particles with porous silica, a protective layer that reduces aggregation but does not prevent access to the core by ions in solution. In addition, the silica coating afforded these nanostructures stability under a wide range of pH …
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Coating and Doping of Ge QDs
… gallium during synthesis were unsuccessful. The silica coating of these particles was successful using a modified Stöber method. Monodispersed silica nanoparticles 20 nm in diameter were synthesized with Ge QDs as seeds. The resulting structures comprise of Ge QD core within a silica sphere. …
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Synthesis and characterization of silicon nanowires, silicon nanorods, and magnetic nanocrystals
… iron oxide encapsulated in fluorescent dye doped silica shells were also synthesized. The as-prepared magnetic nanocrystals are initially hydrophobic and were coated with a uniform silica shell using a microemulsion approach. These colloidal heterostructures have the potential to be used as …
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Gas-phase synthesis of gold- and silica-coated nanoparticles.
… methods are investigated for producing gas-phase coatings of nanoparticles in an "assembly-line" fashion. Separate processes are developed to create coatings from silica and gold that can be used with a variety of core-particle chemistries. A photoinduced chemical vapor deposition (photo-CVD) …
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The inertisation of the zeolites ZSM-5, mordenite and beta by chemical vapour deposition using tetraethoxysilane
… acidity can be inertised by a thin layer of silica coating the external surfaces of the zeolites. The silica layer can also narrow the pore openings uniformly, thus increasing the shape selective properties of the zeolites even more. By implication, coating ZSM-5 in a shell of iso-structural …