Direct observation of liquid-like behavior of a single Au grain boundary

Gilberto Casillas, Arturo Ponce, J. Jesús Velázquez-Salazar, Miguel José-Yacamán

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


Behavior of matter at the nanoscale differs from that of the bulk due to confinement and surface effects. Here, we report a direct observation of liquid-like behavior of a single grain boundary formed by cold-welding Au nanoparticles, 40 nm in size, by mechanical manipulation in situ TEM. The grain boundary rotates almost freely due to the free surfaces and can rotate about 90 degrees. The grain boundary sustains more stress than the bulk, confirming a strong bonding between the nanoparticles. Moreover, this technique allows the measurement of the surface diffusion coefficient from experimental observations, which we compute for the Au nanoparticles. This methodology can be used for any metal, oxide, semiconductor or combination of them.

Original languageEnglish (US)
Pages (from-to)6333-6337
Number of pages5
Issue number14
StatePublished - Jul 21 2013
Externally publishedYes

ASJC Scopus subject areas

  • General Materials Science


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