Fullerene
Mostrando 13-24 de 34 artigos, teses e dissertações.
-
13. Spectroscopic analysis of C80 doping with group III and group V elements using semiempirical PM3 molecular modelling technique
Semiempirical calculations at the level of PM3 of theory were carried out to study the structural and electronic properties of C80 and some of its doped derivatives with the elements of group III and V at the level of PM3 of theory. We have selected these elements to be substituted in the fullerene-C80 cage in order to show the effect of such structural chan
Eclética Química. Publicado em: 2008
-
14. Nanoestruturas formadas por redes orgânicas covalentes
In this work we apply first-principles calculations based on the Density Functional Theory (DFT) to investigate structural and electronic properties of covalent organic frameworks (COF s). These structures were recently obtained experimentally and constitute a new class of porous nanostructures composed only of light elements (H, C, B and O atoms). The coval
Publicado em: 2007
-
15. Preparação e caracterização de nanoestruturas de carbono contendo nitrogenio / Synthesis and characterization of carbon nanostructires containing nitrogen
Nesta tese são apresentados os efeitos nas propriedades estruturais, eletrônicas e de emissão eletrônica por efeito de campo elétrico induzidos pela incorporação de nitrogênio em nanoestruturas de carbono. As nanoestruturas de carbono contendo nitrogênio foram preparadas por pulverização catódica (sputtering) de um alvo de grafite assistido, ou n
Publicado em: 2007
-
16. Plasma characterization of pulsed-laser ablation process used for fullerene-like CNx thin film deposition
An in situ Optical Emission Spectroscopy (OES) characterization was performed on Pulsed-Laser Ablation (PLA) process used for fullerene-like CNx thin film deposition at nitrogen pressures within the 5 - 100 mTorr range. Plumes were generated by ablation of pyrolytic graphite (99.99%) target using a (500 mJ, 7 ns, 1064 nm) Nd: YAG-pulsed laser. The spectra fr
Brazilian Journal of Physics. Publicado em: 2004-12
-
17. Síntese de nanotubos de carbono de parede simples por sublimação de grafite em atmosfera de hélio
Macroscopic samples of fullerene nanostructures are obtained in a modified arc furnace using the electric arc method with a Helium atmosphere at low pressures. High purity graphite rods are used as electrodes but, when drilled and the orifices filled with powders of transition metals (Fe, Co, Ni) acting as catalysts, the resulting particles are carbon nanost
Química Nova. Publicado em: 2002-02
-
18. A bench arc-furnace facility for fullerene and single-wall nanotubes synthesis
A metallic-sample arc-furnace was modified to synthesize fullerenes and nanotubes. The (reversible) changes and the process for producing single-wall nanotubes (SWNTs) are described.
Química Nova. Publicado em: 2001-12
-
19. Sintese e caracterização de complexos platina-fulereno
The reactivity of fullerene-60 was explored on the formation of platinum-fullerene complexes using a variety of ligands, such as: triphenylphosphine, tricyclohexylprosphine, trimetylphosphite, tri-n-butylphosphine, trimethylphosphine, tert-butylisocyanide and carbonyl. The products were obtained from reactions between fullerene [60] and zerovalent platinum c
Publicado em: 2001
-
20. A fullerene molecular tip can detect localized and rectified electron tunneling within a single fullerene–porphyrin pair
A fullerene molecular tip was used to detect electron tunneling from a single porphyrin molecule. Electron tunneling was found to occur locally from an electron-donating moiety of the porphyrin to the fullerene through charge-transfer interaction between them. In addition, electron tunneling within the single fullerene–porphyrin pair exhibited rectifying b
National Academy of Sciences.
-
21. X-ray crystal structure of an anti-Buckminsterfullerene antibody Fab fragment: Biomolecular recognition of C60
We have prepared a monoclonal Buckminsterfullerene specific antibody and report the sequences of its light and heavy chains. We also show, by x-ray crystallographic analysis of the Fab fragment and by model building, that the fullerene binding site is formed by the interface of the antibody light and heavy chains. Shape-complementary clustering of hydro
The National Academy of Sciences.
-
22. Supramolecular self-assembled fullerene nanostructures
Four ionic fullerene derivatives, which are relatively soluble in polar solvents, are shown to organize into morphologically different nanoscale structures. Spheres, nanorods, and nanotubules form in water depending on the side chain appendage of the fullerene spheroid. Images at different nanoscale structures were obtained via transmission electron microsco
National Academy of Sciences.
-
23. Antigenicity of fullerenes: Antibodies specific for fullerenes and their characteristics
The recent interest in using Buckminsterfullerene (fullerene) derivatives in biological systems raises the possibility of their assay by immunological procedures. This, in turn, leads to the question of the ability of these unprecedented polygonal structures, made up solely of carbon atoms, to induce the production of specific antibodies. Immunization of mic
The National Academy of Sciences.
-
24. Convenient separation of high-purity C60 from crude fullerene extract by selective complexation with AlCl3.
A purification procedure for C60 from the fullerene extract has been developed using the differential complexation of C60 and C70 with AlCl3 (or its conjugate acid) in CS2 solution. In addition to pure C60 (>99.8%), the procedure also provides C70-enriched fullerene mixture.