Iwamatsu Masao
Department of Physics, Faculty of Liberal Arts and Sciences, Tokyo City University, Tokyo 158-8557, Japan.
Phys Rev E Stat Nonlin Soft Matter Phys. 2012 Oct;86(4 Pt 1):041604. doi: 10.1103/PhysRevE.86.041604. Epub 2012 Oct 31.
The kinetics of nucleation of a core-shell composite nucleus that consists of a core of stable final phase surrounded by a wetting layer of intermediate metastable phase is studied using the kinetic theory of binary nucleation not only in the size and composition space but also in the component space. The steady-state solution of the Fokker-Planck equation is considered. Various formulas for the critical nucleus at the saddle point as well as for the postcritical nucleus are derived. The kinetics of nucleation at the saddle point is more appropriately characterized in the size and composition space, while the kinetics of the postcritical nucleus is more appropriately described in the component space. Although both the free-energy landscape and the reaction rates play decisive role to determine the kinetics of nucleation at the saddle point, the details of the free-energy landscape are irrelevant to the kinetics of the postcritical nucleus.
利用二元成核动力学理论，不仅在尺寸和组成空间，而且在组分空间研究了由稳定终相核心被中间亚稳相润湿层包围的核壳复合核的成核动力学。考虑了福克 - 普朗克方程的稳态解。推导了鞍点处临界核以及临界后核的各种公式。鞍点处的成核动力学在尺寸和组成空间中描述更为合适，而临界后核的动力学在组分空间中描述更为合适。尽管自由能景观和反应速率在确定鞍点处的成核动力学中都起决定性作用，但自由能景观的细节与临界后核的动力学无关。
