Investigation on cluster distribution and phase transition of adsorption at solid-vapor interface

被引：0
|
作者：
Song B. [1 ]
Wu C. [1 ]
Li Y. [1 ]
机构：
[1] Key Laboratory of Low-grade Energy Utilization Technologies and Systems of Ministry of Education, School of Energy and Power Engineering, Chongqing University, Chongqing
来源：
Huagong Xuebao/CIESC Journal | 2021年 / 72卷 / 05期
关键词：
Adsorption phase change; Cluster distribution; Entropy; Solid-vapor interface; Surface tension;
D O I：
10.11949/0438-1157.20201394
中图分类号：
学科分类号：
摘要：
To explore the cluster distribution and evolution during the process of adsorption at solid-vapor interface, a series of experimental measurements and theoretical analysis are hybrid to study the characteristics of water vapor adsorption on silica and graphite surfaces. The adsorption isotherms in the full pressure range are obtained based on the Zeta adsorption model, the cluster distributions at different pressure ratios are obtained, the critical conditions for the adsorption phase change and wetting are determined. The results showed that Zeta adsorption isotherm has no singularity at saturation pressure. The adsorption measurements are in good agreement with the theoretical prediction by Zeta adsorption model. Meanwhile, the vapor adsorbate is formed as clusters with different number of molecules. In the low pressure ratio zone, small molecular clusters and zero adsorption units dominate the adsorption site. As the pressure ratio increases, the types of adsorption clusters increase. Once the pressure exceeds a certain value, the entropy reaches a maximum value, indicating the occurrence of phase transition at the interface. The surface tension of graphite and silica and the critical conditions of interfacial wetting under the condition of zero adsorption are determined. Under the wetting pressure ratio, homogeneous macromolecular clusters gather to form a liquid-film-like wetting interface. © 2021, Editorial Board of CIESC Journal. All right reserved.
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页码：2680 / 2687
页数：7
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