Theory of bulk, surface and interface phase transition kinetics in thin films.
Theory of bulk, surface and interface phase transition kinetics in thin films.
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薄膜体相、表面和界面相变动力学理论。
DOI：
10.1063/1.1760737
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
M. Bonn
中科院分区：
文献类型：
--
作者：
E. Backus;M. Bonn
我们报告了一项在受限二维系统中相变动力学的理论研究，其动机是最近在支持的非晶薄水膜中从非晶到结晶转变的实验结果[E.H.G.]巴克斯，M.L. greea， A.W. Kleyn和M. Bonn，物理学家。启。[待出版]。我们推广和扩展了现有的理论，以同时描述在体、样品-真空表面和样品-支撑界面上的转换（结晶）分数作为时间的函数。这里提出的一般方法的结果是随时间变化的转换体积、表面和界面分数的表达式，薄膜的任意解吸速率、成核和生长速率的表达式，还包括有限成核晶粒尺寸。计算新相成核的转换体、表面和界面分数(i)在体中，（ii）在载体-样品界面，（iii）在样品表面（样品-真空界面），得到9个表达式。结果表明，同时监测体、表面和界面组分的优势，可以明确地说明成核的位置，并可靠地确定相关结晶参数的值。
We report a theoretical study of phase transition kinetics in confined two-dimensional systems, motivated by recent experimental results on the amorphous-to-crystalline transition in supported, thin amorphous water films [E.H.G. Backus, M.L. Grecea, A.W. Kleyn, and M. Bonn, Phys. Rev. Lett. (to be published)]. We generalize and extend existing theories to simultaneously describe the converted (crystalline) fractions in the bulk, at the sample-vacuum surface, and at the sample-support interface as a function of time. The general approach presented here results in expressions for the time-dependent converted bulk, surface, and interface fractions, for arbitrary desorption rate from the thin film, nucleation and growth rates and also includes finite nucleation grain size. The converted bulk, surface, and interface fractions are calculated for nucleation of the new phase occurring (i) in the bulk, (ii) at the support-sample interface, and (iii) at the sample surface (sample-vacuum interface), resulting in nine expressions. The results demonstrate the advantage of monitoring bulk, surface and interface fractions simultaneously to make definite statements regarding the location of the nucleation, and to reliably determine the values of the relevant crystallization parameters.