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 99 for “"NANOCLUSTERS"”.
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Competitive Nucleation in Nanoclusters
… molecular dynamic simulations have shown that nanoclusters, at the same initial conditions, freeze to different structures through a competitive process. Understanding the mechanism of nucleation requires the knowledge of the reaction coordinate, which consists of a set of variables that …
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Purification of recombinant proteins with magnetic nanoclusters
… are colloidally stable dispersions of magnetic nanoclusters in water that do not settle gravitational and moderate magnetic fields due to their small size. The magnetic nanoclusters possess large surface area for protein adsorption without any porous structure, resulting in much faster mass …
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Synthesis, characterization, and application of magnetic gold nanoclusters
… synthesis of magnetically active gold nanoclusters (MGNCs) with average particle sizes under 100 nm. This synthesis has two appealing features: (1) the synthesis is conducted entirely in water, with no amphiphilic surfactants that require subsequent removal, and (2) the chemical …
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Characterization of carbon nanoclusters produced by arc-discharge
… systematic study for growth phenomena of carbon nanoclusters prepared by a arc discharge technique. Through a series of experiments, it has been found that morphology and yield of nanotubes strongly depend on the processing parameters. A low current density of 190 A/cm², a discharge voltage of 27 …
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Radiofrequency heating of nanoclusters and nanoparticles for enzyme activation
… results. Following this, Au25(SR)18 gold nanoclusters were used as a model system to investigate the controversial heating rates reported for gold nanoparticles. For the first time the observed rates were explained entirely with a single mechanism: electrophoretic heating. The success of …
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Optical properties and biological applications of fluorescent gold nanoclusters
… novel fluorescent nanomaterial, fluorescent gold nanoclusters (AuNCs) possess numerous exceptional characteristics compared with other luminescent materials such as good water-solubility, high photostability, large Stokes shift, ultrasmall size, nontoxicity, and good biocompatibility. Despite …
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First-principles studies on oxide nanoclusters in bcc Fe
… contain highly dispersed nanometer-size Y-Ti-O nanoclusters, and are manufactured via powder metallurgy. The presence of nanoclusters leads to high temperature stability and radiation resistance. Despite many research activities using advanced analytical techniques such as Transmission Electron …
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Catalytic activation of Rh,Pd nanoclusters supported on Ceria
Rh,Pd/CeO2 nanocatalysts exhibit excellent activity and stability for ethanol steam reforming (ESR) at 400°C. This thesis encompasses experimental and computational investigations of this nanocatalyst. The activation mechanism of Rh,Pd/CeO2 nanocatalysts under ethanol steam reforming conditions is …
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Synthesis and characterization of block copolymers containing metal nanoclusters
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1997.
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TOWARD UNDERSTANDING THE FUNDAMENTALS IN THE SYNTHESIS OF METAL NANOCLUSTERS
Gold nanoclusters (Au NCs) are ultrasmall particles with the core size less than 2 nm. This size regime is in the transition from a single gold atom to a gold nanoparticle (Au NP). The general synthesis method of Au NCs is adpated from Brust method, where thiolate ligand is first mixed with Au(III) …
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Studies on Thermodynamic Properties of Nanoclusters With Thin-Film Nanocalorimetry
We have measured the energy released in the coalescence process. Smaller clusters were formed in the open areas between pre-existed larger clusters. Coalescence was thermal activated in a first heating cycle, and the heat capacities of the sample were measured during the multiple heating cycles. …
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Characterization and technical studies of semiconductor nanoclusters synthesized within polymer films
Semiconductor nanoclusters were synthesized within diblock copolymer films containing carboxylic acid units on one of the blocks. Diblock copolymer films microphase separate during film casting, and yield many different morphologies (spherical lamellar/ cylindrical ) depending on the ratio of the …
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Single-crystal metal oxides and supported metal nanoclusters as model catalyst sytems
… relevant properties of supported metal nanoclusters are strongly influenced by interactions with the support, even if the cluster morphology is identical for particles on various different substrates.
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Nanoclusters for Cancer Therapy: Assesment of Their Reactive Oxygen Species Generation and Stability
… and treatment of disease. Recently, metal nanoclusters have emerged as materials that can be used to identify and treat cancer. Nanoclusters or "clusters" are small arrangements of metal atoms protected by an exact number of ligands. Clusters have unique properties that make them useful for …
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Tailoring Local Conductivity by the Formation of Ag Nanoclusters in SiO2 Xerogel Films
<p>Porous silicon dioxide thin films were produced via dip-coating and doped with Ag+ by adding AgNO3 to the dipping solution. Nanoparticles were formed within the pores of these films by UV exposure. Nanoparticle formation was confirmed by UV-visible spectroscopy and Transmission Electron …
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Block copolymers containing silver and iron oxide nanoclusters for electrical and magnetic applications
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.
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Development of multicomponent coupled-cluster theory and its application to nanoclusters and molecular systems
<p>Many theoretical and computational methods are based upon the Born-Oppenheimer approximation. This approximation greatly simplifies the search for a wave function that describes all electrons and nuclei in a chemical system. This is accomplished by assuming that the motion of nuclei and …
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Plasmonic Nanostructures: Optical Nanocircuits, Tunable Charge Transfer Plasmons, and Properties of Fano Resonant Nanoclusters
… on exploring new properties of complex plasmonic nanoclusters and applying them in applications of optical nanocircuits, frequency modulation, and surface enhanced Raman scattering. First, this thesis demonstrates the realization of 3D optical nanocircuits using plasmonic dimer antenna composed of …
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Effect of size and surface structure manipulation on the luminescent properties of silicon nanoclusters
… electronic and structural properties of silicon nanoclusters. Electrochemical etching was used to produce particles smaller than 3 nm in diameter. Electron microscopy and material analysis studies showed the particles to have a crystalline silicon core with significant structural reconstruction …
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