کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7880908 | 1509593 | 2015 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A model of Kirkendall hollowing of core-shell nanowires and nanoparticles controlled by short-circuit diffusion
ترجمه فارسی عنوان
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
چکیده انگلیسی
We propose a model for the hollowing of the core-shell nanowires caused by the Kirkendall effect during chemical reaction (oxidation) on the nanowire surface. We consider the self-diffusion of the atoms of the core along the grain boundaries in the shell, on the exposed surface of the core, and along the core-shell interface as the main factors controlling the hollowing kinetics. The model relies on the variational method of calculating the chemical potential of the metal atoms diffusing along the core-shell interphase boundary. A comparison of model predictions with the results of hollowing studies of Ni-NiO core-shell nanoparticles [J.G. Railsback et al., ACS Nano 4 (2010) 1913-1920] gave a value for the self-diffusion coefficient of Ni along the grain boundaries in NiO at 573Â K of 3Â ÃÂ 10â20Â m2Â sâ1, in good agreement with the literature data. We demonstrate that high values of the contact angle of the core on the shell promote pore instability and formation of secondary side pores (pores multiplication).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 83, 15 January 2015, Pages 180-186
Journal: Acta Materialia - Volume 83, 15 January 2015, Pages 180-186
نویسندگان
Leonid Klinger, Oliver Kraft, Eugen Rabkin,