Elastic properties of surfaces on nanoparticles / Wilhelm G. Wolfer in Acta materialia, Vol. 59 N° 20 (Décembre 2011)  

Public ISBD [article]  inActa materialia > Vol. 59 N° 20 (Décembre 2011) . - pp. 7736–7743 Titre : Elastic properties of surfaces on nanoparticles Type de document : texte imprimé Auteurs : Wilhelm G. Wolfer, Auteur Année de publication : 2012 Article en page(s) : pp. 7736–7743 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Elastic properties Lattice strains Nanoparticles Surface stress Résumé : Lattice parameter changes in nanoparticles can be used to determine the surface stress of solids. In the past a Laplace–Young relationship has been employed to interpret the lattice parameter changes as a function of the particle size. In the meantime, however, atomistic calculations revealed a purely mechanical origin of the surface stress that is consistent with elasticity theory for solid surfaces as developed by Gurtin and Murdoch. In this theory the equilibrium distance for surface atoms may differ from that in the bulk solid, and the elastic properties of the surface layer may also deviate from bulk values. We apply this Gurtin–Murdoch theory to spherical nanoparticles and reanalyze past data as well as results from recent theoretical calculations on lattice parameter changes, thereby enabling us to determine surface properties commensurate with the mechanical interpretation of surface stress. ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645411006100 [article] Elastic properties of surfaces on nanoparticles [texte imprimé] / Wilhelm G. Wolfer, Auteur . - 2012 . - pp. 7736–7743. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 59 N° 20 (Décembre 2011) . - pp. 7736–7743 Mots-clés : Elastic properties Lattice strains Nanoparticles Surface stress Résumé : Lattice parameter changes in nanoparticles can be used to determine the surface stress of solids. In the past a Laplace–Young relationship has been employed to interpret the lattice parameter changes as a function of the particle size. In the meantime, however, atomistic calculations revealed a purely mechanical origin of the surface stress that is consistent with elasticity theory for solid surfaces as developed by Gurtin and Murdoch. In this theory the equilibrium distance for surface atoms may differ from that in the bulk solid, and the elastic properties of the surface layer may also deviate from bulk values. We apply this Gurtin–Murdoch theory to spherical nanoparticles and reanalyze past data as well as results from recent theoretical calculations on lattice parameter changes, thereby enabling us to determine surface properties commensurate with the mechanical interpretation of surface stress. ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645411006100

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