Nanostructured oxide-based powders: Investigation of the growth mode of the CeO(sub 2) clusters on the YSZ surface

Article Abstract:

Several CeO(sub 2)/yttria-stabilized zirconia (YSZ) nanocomposite powders differing in the Ce/Zr ratio were synthesized by wet impregnation and characterized by means of X-ray photoelectron spectroscopy (XPS), transmission electron microscopy, energy dispersive spectroscopy, and X-ray diffraction. A 3-D growing mechanism was observed for the CeO(sub 2)/YSZ nanoparticles, while XPS also revealed the presence of Ce(III) and Ce(IV) ions at the interface supporting oxides.

Science & research, Zirconium, Research, Chemical synthesis

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Oxidation, deformation, and destruction of carbon nanotubes in aqueous ceric sulfate

Article Abstract:

A study reports the unexpected transformation of carbon nanotubes (CNTs) to nanocrystalline materials and amorphous carbon, and the complete destruction of single-walled carbon nanotubes (SWCNTs). The process involves only treatment in dilute aqueous ceric sulfate (CS), 0.1N Ce(SO4)2, with sonication at ambient temperature for 2-5 h.

Deformations (Mechanics), Deformation, Oxidation-reduction reaction, Oxidation-reduction reactions, Sulfates

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Theoretical calculation of the dehydrogenation of ethanol on a Rh/Ce[O.sub.2](111) surface

Article Abstract:

Periodic density functional theory (DFT) is used to investigate the dehydrogenation of ethanol on an Rh/Ce[O.sub.2] (111) surface. The adsorbed intermediates and the reaction barriers in the pathways are addressed and the possible potential-energy surfaces are described.

Rhodium, Usage, Dehydrogenation, Density functionals, Density functional theory

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