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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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Presentation on theme: "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."— Presentation transcript:

1 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

2 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

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

4 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. 15-19.

5 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. 15-19.

6 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): 711-714, Science

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

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

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

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

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