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Surface preferential stiffening and melting of Ag nanostructures
Liu Xinjuan 1,Yang Liwen 1,Sun Changqing 2 * #
1.xiangtan university
2.nanyang technological university
*Correspondence author
#Submitted by
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Funding: none
Opened online: 7 July 2009
Accepted by: none
Citation: Liu Xinjuan,Yang Liwen,Sun Changqing.Surface preferential stiffening and melting of Ag nanostructures[OL]. [ 7 July 2009] http://en.paper.edu.cn/en_releasepaper/content/33699
 
 
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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