کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9829736 | 1524497 | 2005 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Nucleation, growth, and coarsening for two- and three-dimensional phase transitions
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Phase transitions from a metastable state often occur by nucleation accompanied by particle growth and eventually by Ostwald coarsening. In closed systems, the supersaturation declines as particles nucleate and grow, causing an increase in the stable critical nucleus size. Particles below the critical size dissolve spontaneously during coarsening and their mass is released to contribute to further growth of remaining particles. By developing a population balance model that represents nucleation, growth, and coarsening, we here determine the dynamics of particle size distributions (PSDs). The governing equations are solved numerically to show that the transition from nucleation and growth to coarsening occurs over a relatively long time period. The asymptotic coarsening stage reveals a power-law increase in average particle mass as the PSD evolves to a (minimum) polydispersity index of unity for both two-dimensional (2-D) and 3-D phase transitions. The model agrees with published conclusions that nucleation and coarsening overlap when interfacial energy is small or supersaturation is large.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Crystal Growth - Volume 279, Issues 3â4, 1 June 2005, Pages 466-476
Journal: Journal of Crystal Growth - Volume 279, Issues 3â4, 1 June 2005, Pages 466-476
نویسندگان
Giridhar Madras, Benjamin J. McCoy,