|Title||Metal-hydride transformation kinetics in Mg nanoparticles|
|Publication Type||Articolo su Rivista peer-reviewed|
|Year of Publication||2009|
|Authors||Pasquini, L., Callini E., Piscopiello E., Montone A., Antisari M.V., and Bonetti E.|
|Journal||Applied Physics Letters|
|Keywords||Constant rates, Fourier transforms, Growth (materials), Hydride formations, Hydride transformations, Hydrogen, Hydrogen cycling, Hydrogen sorptions, Inert gas condensations, Inert gases, Magnesium, Magnesium oxides, Magnesium printing plates, Nanoparticles, One-dimensional growths, Particle surfaces, Reverse transformations, Sorption, Three dimensional, Three-dimensional growths, Transmission electrons, Volumetric apparatus|
The hydrogen sorption kinetics of magnesium nanoparticles prepared by inert gas condensation and coated by a magnesium oxide layer were investigated by a volumetric apparatus. The metal-hydride transformation was studied by transmission electron microscopy of the nanoparticles both in the as-prepared state and after hydrogen cycling. In small nanoparticles (≈35 nm) hydride formation proceeds by one-dimensional growth controlled by diffusion through the hydride, while the reverse transformation to metal involves interface-controlled three-dimensional growth of nuclei formed at constant rate. Large nanoparticles (≈450 nm) exhibit very low reactivity attributed to reduced probability of hydrogen dissociation/recombination and nucleation at the particle surface. © 2009 American Institute of Physics.
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