Surface preferential stiffening and melting of Ag nanostructures
首发时间:2009-07-07
Abstract:It has long been puzzling that the surface shell of a nanostructured material is often harder but it melts easier compared with its core interior. Here we clarify that the shortened and strengthened bond between under-coordinated atoms in the surface region dictates the seemingly conflicting effects. Theoretical reproduction of the measured size dependence of the elastic modulus and the melting point of Ag nanostructures affirms that the energy density rise determines the elasticity enhancement while the cohesive energy drop per discrete atom determines the thermal stability depression, enabling the surface preferential stiffening and melting, as one often observed.
keywords: elastic stiffening thermal stability Ag nanostructures
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Surface preferential stiffening and melting of Ag nanostructures
摘要:It has long been puzzling that the surface shell of a nanostructured material is often harder but it melts easier compared with its core interior. Here we clarify that the shortened and strengthened bond between under-coordinated atoms in the surface region dictates the seemingly conflicting effects. Theoretical reproduction of the measured size dependence of the elastic modulus and the melting point of Ag nanostructures affirms that the energy density rise determines the elasticity enhancement while the cohesive energy drop per discrete atom determines the thermal stability depression, enabling the surface preferential stiffening and melting, as one often observed.
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Surface preferential stiffening and melting of Ag nanostructures
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