Ting-Yun Huang, 2012/11/15 Page 1 3.14/3.40J/22.71J Recap Diffusion Process & Surface Evolution Ting-Yun Huang 2012 Nov. 15 th.

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Ting-Yun Huang, 2012/11/15 Page /3.40J/22.71J Recap Diffusion Process & Surface Evolution Ting-Yun Huang 2012 Nov. 15 th

Outline Diffusion of 1-2-v system: Interdiffusivity Kirkendall Effect Different diffusion mechanisms Fast diffusion path and lattice diffusion Capillary force/Surface energy Ting-Yun Huang, 2012/11/15 Page 2

Diffusion of 1-2-v system: Interdiffusivity Ting-Yun Huang, 2012/11/15 Page 3

Kirkendall Effect Ting-Yun Huang, 2012/11/15 Page 4 Direct exchange mechanism Ring mechanism Kirkendall’s experimental setup. Use Mo as fictitious marker. JOM.49 (6) (1997), pp

Kirkendall Effect Vacancy Mechanism Criticism from Mehl The measured Zn concentration varies, and the diffusivity is different in Zn and Cu. Nanoparticle system. Ting-Yun Huang, 2012/11/15 Page 5 JOM.49 (6) (1997), pp

Kirkendall Effect- Nanoscale Ting-Yun Huang, 2012/11/15 Page 6 Hollow nanocrystals Kirkendall effect forming the nano porous materials Applications: due to large surface area, can be applied to nano- reactor and catalysts, etc. Yin et al., 304 (5671): , Science

Diffusion of different mechanisms Ting-Yun Huang, 2012/11/15 Page 7

Fast diffusion path and lattice diffusion Ting-Yun Huang, 2012/11/15 Page 8

Surface energy/Young-Laplace Pressure Ting-Yun Huang, 2012/11/15 Page 9

THANK YOU! Questions? Comments? Ting-Yun Huang, 2012/11/15 Page 10