Nanocavity hardening: impact of broken bonds at the negatively curved surfaces

Yu Ding; Yi Chun Zhou; Sun Changqing

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Nanocavity hardening: impact of broken bonds at the negatively curved surfaces

Yu Ding 1,Yi Chun Zhou 2,Sun Changqing 3 * #

1.School of Electronic and Electrical Engineering, Nanyang Technological University

2.Key laboratory of low-Dimensional Materials and Application Technologies (Xiangtan University), Ministry of Education

3.Nanyang Technological University, SIngapore

*Correspondence author

#Submitted by

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Funding: none

Opened online:27 March 2007

Accepted by: none

Citation: Yu Ding,Yi Chun Zhou,Sun Changqing.Nanocavity hardening: impact of broken bonds at the negatively curved surfaces[OL]. [27 March 2007] http://en.paper.edu.cn/en_releasepaper/content/11721

It is expected that atomic vacancies or nanometric cavities reduce the number of chemical bonds of nearby atoms and hence the strength of a voided solid. However, the hardness of a porous specimen does not always follow this simple picture of coordination counting. An introduction of a certain amount of atomic vacancies or nanocavities could, instead, enhance the mechanical strength of the porous specimen. Understanding the mechanism behind the intriguing observations remains yet a high challenge. Here we show with analytical expressions that the shortened and strengthened bonds between the under-coordinated atoms and the associated local strain and energy trapping [Sun, Prog Solid State Chem 35, 1-159 (2007)] in the negatively curved surface skins dominate the observed nanocavity hardening. Agreement between predictions and the experimentally observed size-dependence of mechanical strength of some nanoporous materials evidences for the proposed mechanism.

Keywords:Cavity, foams, nanostructures

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