Gas adsorption and capillary condensation in nanoporous alumina films

被引：64

作者：

Casanova, Felix ^{[1
]}

Chiang, Casey E. ^{[1
]}

Li, Chang-Peng ^{[1
,2
]}

Roshchin, Igor V. ^{[1
,3
]}

Ruminski, Anne M. ^{[4
]}

Sailor, Michael J. ^{[4
]}

Schuller, Ivan K. ^{[1
]}

机构：

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

[2] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA

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

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

来源：

NANOTECHNOLOGY | 2008年 / 19卷 / 31期

关键词：

D O I：

10.1088/0957-4484/19/31/315709

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Gas adsorption and capillary condensation of organic vapors are studied by optical interferometry, using anodized nanoporous alumina films with controlled geometry (cylindrical pores with diameters in the range of 10 - 60 nm). The optical response of the film is optimized with respect to the geometric parameters of the pores, for potential performance as a gas sensor device. The average thickness of the adsorbed film at low relative pressures is not affected by the pore size. Capillary evaporation of the liquid from the nanopores occurs at the liquid - vapor equilibrium described by the classical Kelvin equation with a hemispherical meniscus. Due to the almost complete wetting, we can quantitatively describe the condensation for isopropanol using the Cohan model with a cylindrical meniscus in the Kelvin equation. This model describes the observed hysteresis and allows us to use the adsorption branch of the isotherm to calculate the pore size distribution of the sample in good agreement with independent structural measurements. The condensation for toluene lacks reproducibility due to incomplete surface wetting. This exemplifies the relevant role of the fluid - solid (van der Waals) interactions in the hysteretic behavior of capillary condensation.

引用

页数：6

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