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Nanomaterials show unexpected strength under stress
Date:3/12/2008

at the nanoscale. They found that the silica will stretch as much as gold or silver and will continue to deform beyond the point that would be predicted using its bulk-scale properties.

Hawa, Henz and Zachariahs simulations reaffirmed their study and added some additional details. They showed that both nanoparticle size and morphologywhether the material is basically crystalline or amorphous, for examplehave an effect on the observed ductility and tensile strength because those factors influence the mobility of surface atoms. In the simulations, the smaller the particles in the aggregate the more ductile the material behaved. Crystalline structures exhibited greater strength when stressed and deformed long after the critical yield point observed macroscopically.

Namboodiri explained that although the work is very basic, these findings might one day inform the design of microelectronic mechanical devices.


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Contact: Mark Esser
mark.esser@nist.gov
301-975-2767
National Institute of Standards and Technology (NIST)
Source:Eurekalert  

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