Nucleation versus spinodal decomposition in confined binary solutions
Nucleation versus spinodal decomposition in confined binary solutions
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DOI：
10.1063/1.2774989
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发表时间：
2007-09-21
影响因子：
4.4
通讯作者：
Schmelzer, Juern W. P.
中科院分区：
文献类型：
--
作者：
Abyzov, Alexander S.;Schmelzer, Juern W. P.
在基于广义Gibbs方法的广义热力学团簇模型的框架内，分析了调幅节点分解和形核的基本特征，以及这两种机制之间的转变。因此，代表系统中的密度或组成变化的团簇可以在大小和它们的密集状态参数(例如，密度和组成)上随时间改变。在第一部分的分析中，我们考虑了依赖于系统初始状态的相分离过程，当可以忽略由于团簇的演化而引起的环境系统的状态参数的变化时，就像无限大系统中的团簇形成一样。作为下一步，分析了状态参数的变化对集群演化的影响。这种耗尽效应对于分析受限系统中的相形成和理解大(无限大)系统中团簇的演化都具有重要意义。热力学分析的结果在两种情况下都被用来显示热力学约束对相分离过程动力学的影响。(C)2007年美国物理研究所。
Basic features of spinodal decomposition, on one side, and nucleation, on the other side, and the transition between both mechanisms are analyzed within the framework of a generalized thermodynamic cluster model based on the generalized Gibbs approach. Hereby the clusters, representing the density or composition variations in the system, may change with time both in size and in their intensive state parameters (density and composition, for example). In the first part of the analysis, we consider phase separation processes in dependence on the initial state of the system for the case when changes of the state parameters of the ambient system due to the evolution of the clusters can be neglected as this is the case for cluster formation in an infinite system. As a next step, the effect of changes of the state parameters on cluster evolution is analyzed. Such depletion effects are of importance both for the analysis of phase formation in confined systems and for the understanding of the evolution of ensembles of clusters in large (in the limit infinite) systems. The results of the thermodynamic analysis are employed in both cases to exhibit the effect of thermodynamic constraints on the dynamics of phase separation processes. (c) 2007 American Institute of Physics.