Thermodynamics of water intrusion in nanoporous hydrophobic solids
Thermodynamics of water intrusion in nanoporous hydrophobic solids
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DOI：
10.1039/b807471b
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发表时间：
2008-01-01
影响因子：
3.3
通讯作者：
Fuchs, Alain H.
中科院分区：
文献类型：
--
作者：
Cailliez, Fabien;Trzpit, Mickael;Fuchs, Alain H.
本文报道了水侵入silicalite-1和ferrerite沸石的实验和分子模拟研究。本研究的主要结论是，水的冷凝发生通过一个真正的一级相变，提供的互连孔结构是三维的。在极端限制的情况下（镁碱沸石），冷凝发生通过一个连续的过渡，这是由一阶过渡线和临界点随着限制的增加而移动。目前的研究结果与通常认为常规相变不能在微孔固体如沸石中发生的观点不一致。侵入/挤出过程的最重要的特征可以从平衡热力学的角度来理解。我们相信，这些发现是非常普遍的疏水性固体，即非润湿以及润湿的水-固体界面系统。
We report a joint experimental and molecular simulation study of water intrusion in silicalite-1 and ferrerite zeolites. The main conclusion of this study is that water condensation takes place through a genuine first-order phase transition, provided that the interconnected pores structure is 3-dimensional. In the extreme confinement situation (ferrierite zeolite), condensation takes place through a continuous transition, which is explained by a shift of both the first-order transition line and the critical point with increasing confinement. The present findings are at odds with the common belief that conventional phase transitions cannot take place in microporous solids such as zeolites. The most important features of the intrusion/extrusion process can be understood in terms of equilibrium thermodynamics considerations. We believe that these findings are very general for hydrophobic solids, i.e. for both nonwetting as well as wetting water-solid interface systems.