Effect of surface interactions on the hysteresis of capillary condensation in nanopores

被引：31

作者：

Casanova, F. ^{[1
]}

Chiang, C. E. ^{[1
]}

Li, C. -P. ^{[1
]}

Roshchin, I. V. ^{[1
,2
]}

Ruminski, A. M. ^{[3
]}

Sailor, M. J. ^{[3
]}

Schuller, I. K. ^{[1
]}

机构：

[1] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

[2] Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA

[3] Univ Calif San Diego, Dept Chem & Biochem, La Jolla, CA 92093 USA

来源：

EPL | 2008年 / 81卷 / 02期

关键词：

D O I：

10.1209/0295-5075/81/26003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Gas adsorption and liquid desorption of a number of organic vapors in anodized nanoporous alumina, with controlled geometry (cylindrical pore diameters from 10 to 60 nm), are studied using optical interferometry. The narrow- diameter distribution of disconnected pores allows checking the validity of the (long-predicted but not experimentally verified) Kelvin equation without any adjustable parameters, modeling or other assumptions. Evaporation occurs at liquid-vapor equilibrium according to this equation, whereas condensation occurs from metastable states of the vapor phase by nucleation, enhanced by surface defects inside the nanopores. This produces hysteresis, in qualitative agreement with theoretical models and simulations that use Van der Waals interactions between the fluid and the pore surface. The reproducibility of the hysteresis depends on the strength of these interactions, which play an important role in the dynamics of capillary condensation. Copyright (C) EPLA, 2008.

引用

页数：5

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