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Mostrando ítems 1-10 de 16
Artículo
Study of the dehydroxylation-rehydroxylation of pyrophyllite
(American Ceramic Society, 2010)
Pyrophyllite is a raw material of significant interest due to its large number of applications. Most of these applications require a thermal transformation of pyrophyllite; this thermal transformation implies the release ...
Artículo
Iron-modified ceria and Au/ceria catalysts for Total and Preferential Oxidation of CO (TOX and PROX)
(Elsevier, 2010)
Iron-modified ceria supports containing different molar percentages of Fe (0%, 10%, 25%, and 50%) were synthesized by thermal decomposition of the metal propionates. The formation of a Ce-Fe oxide solid solution is evidenced ...
Artículo
Magnetometry and electron paramagnetic resonance studies of phosphine- and thiol-capped gold nanoparticles
(American Institute of Physics, 2010)
In the last years, the number of studies performed by wholly independent research groups that confirm the permanent magnetism, first observed in our research lab, for thiol-capped Au nanoparticles (NPs) has rapidly increased. ...
Artículo
On the microstructure of thin films grown by an isotropically directed deposition flux
(American Institute of Physics, 2010)
The influence of isotropically directed deposition flux on the formation of the thin film microstructure at low temperatures is studied. For this purpose we have deposited TiO2 thin films by two different deposition ...
Artículo
Tilt angle control of nanocolumns grown by glancing angle sputtering at variable argon pressures
(American Institute of Physics, 2010)
We show that the tilt angle of nanostructures obtained by glancing angle sputtering is finely tuned by selecting the adequate argon pressure. At low pressures, a ballistic deposition regime dominates, yielding high directional ...
Artículo
Gold supported on metal-doped ceria catalysts (M = Zr, Zn and Fe) for the preferential oxidation of CO (PROX)
(Academic Press, 2010)
A series of ceria oxides doped with 10 mol.% of Zr, Zn and Fe have been prepared by a pseudo sol-gel method throughout the thermal decomposition of the corresponding metallic propionates. With these supports, 1 wt.% gold ...
Artículo
TiO2-SiO2 one-dimensional photonic crystals of controlled porosity by glancing angle physical vapour deposition
(Royal Society of Chemistry, 2010)
Herein we present a synthetic route to attain porous one-dimensional photonic crystals of high optical quality. The method employed, based on the alternate deposition of TiO2 and SiO2 porous layers by glancing angle physical ...
Artículo
Surface nanostructuring of TiO2 thin films by high energy ion irradiation
(American Institute of Physics, 2010)
The effects of a high ion dose irradiation on TiO2 thin films under different conditions of temperature and ion nature are discussed. We have shown that anatase TiO2 thin films irradiated with N+ ions at room temperature ...
Artículo
Segregation-induced grain boundary electrical potential in ionic oxide materials: A first principles model
(Elsevier, 2010)
A first principles continuum analytical model for cationic segregation to the grain boundaries in complex ceramic oxides is presented. The model permits one to determine the electric charge density and the segregation-induced ...
Artículo
Mechanochemical preparation of BaTiO3-Ni nanocomposites with high dielectric constant
(Elsevier, 2010)
A mechanochemical procedure is proposed for an easy preparation of a BaTiO3-Ni composite in a single step. BaTiO3 and Ni powders available in the market are mixed by dry ball milling producing a decrease of particle size ...