Capillary condensation as a morphological transition.
Capillary condensation as a morphological transition.
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DOI：
10.1016/s0001-8686(01)00079-3
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发表时间：
2002-02
影响因子：
15.6
通讯作者：
K. Kornev;I. Shingareva;A. Neimark
中科院分区：
文献类型：
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作者：
K. Kornev;I. Shingareva;A. Neimark
在对称性破缺的思想内，考虑了圆柱形孔中的毛细冷凝/蒸发过程。毛细冷凝/蒸发被视为不同对称性的润湿膜配置之间的形态过渡。我们考虑了两种模型：（i）毛细作用的经典拉普拉斯理论和（ii）考虑了以分离压力表示的表面力的Derjaguin模型。遵循埃弗雷特和海恩斯的想法，冷凝/蒸发的问题被认为是从颠簸/起伏到透镜的过渡。利用相图的方法，我们讨论了隐藏在拉普拉斯方程和Derjaguin方程中的这种转变的数学机制。通过对凸块和透镜形成的能垒的分析，表明凸块的形成是毛细凝聚的一种特性：对于孔隙中的汽液相变，凸块起着与体相流体中球形核相同的作用。我们还表明，Derjaguin模型承认在特定条件下负责膜图案化的各种界面配置。
The process of capillary condensation/evaporation in cylindrical pores is considered within the idea of symmetry breaking. Capillary condensation/evaporation is treated as a morphological transition between the wetting film configurations of different symmetry. We considered two models: (i) the classical Laplace theory of capillarity and (ii) the Derjaguin model which takes into account the surface forces expressed in terms of the disjoining pressure. Following the idea of Everett and Haynes, the problem of condensation/evaporation is considered as a transition from bumps/undulations to lenses. Using the method of phase portraits, we discuss the mathematical mechanisms of this transition hidden in the Laplace and Derjaguin equations. Analyzing the energetic barriers of the bump and lens formation, it is shown that the bump formation is a prerogative of capillary condensation: for the vapor–liquid transition in a pore, the bump plays the same role as the spherical nucleus in a bulk fluid. We show also that the Derjaguin model admits a variety of interfacial configurations responsible for film patterning at specific conditions.