Nature of capillary condensation and evaporation processes in ordered porous materials

被引：99

作者：

Grosman, A

Ortega, C

机构：

[1] Univ Paris 06, INSP, CNRS, UMR 75 88, F-75015 Paris, France

[2] Univ Paris 07, INSP, CNRS, UMR 75 88, F-75015 Paris, France

来源：

LANGMUIR | 2005年 / 21卷 / 23期

关键词：

D O I：

10.1021/la051030o

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report on a detailed experimental study of capillary condensation-evaporation processes of N-2 in ordered mesoporous SBA-15 silica. We have carried out measurements of boundary hysteresis loops, reversal curves, and subloops in order to test whether this material behaves as an assembly of independent cylindrical pores open at both ends. With these data, we come to the conclusion that, whereas the boundary hysteresis loop has the classical shape of type H1 associated with condensation-evaporation in cylindrical pores open at both ends, the capillary evaporation does not take place at equilibrium as it is generally assumed. Moreover, the pores do not desorb independently of one another.

引用

页码：10515 / 10521

页数：7

共 47 条

[1] A characterisation of the morphology off porous silicon films by proton energy loss fluctuation measurements with a narrow resonance in the N-15(p,alpha gamma)C-12 reaction [J].