Adsorption hysteresis in ordered mesoporous silicas

被引：2
作者：
Kunimitsu Morishige
机构：
[1] Okayama University of Science,Department of Chemistry
来源：
Adsorption | 2008年 / 14卷
关键词：
Adsorption hysteresis; Ordered mesoporous materials; Capillary condensation;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
We review some recent progress in experimental studies of the adsorption hysteresis of simple molecules in ordered mesoporous silicas. We show that the nature of the adsorption hysteresis due to capillary condensation can be examined with less ambiguity by measuring the hysteresis loop for the ordered mesoporous silicas with three types of pore geometries (cylindrical, interconnected cylindrical, and interconnected spherical) over a wide temperature range. The adsorption hysteresis arises from the metastability of a confined phase and the temperature at which the hysteresis disappears is lower than the critical temperature of vapor-liquid equilibrium in pores. The hysteresis occurs mainly on the desorption rather than adsorption branch, irrespective of the pore geometries.
引用
收藏
页码：157 / 163
页数：6
相关论文
共 108 条
[1]  
Beck J.S.(1992)A new family of mesoporous molecular sieves prepared with liquid crystal templates J. Am. Chem. Soc. 114 10834-10843
[2]  
Vartuli J.C.(1989)Adsorption hysteresis in porous materials Pure Appl. Chem. 61 1845-1852
[3]  
Roth W.J.(1999)The structure of MCM-48 determined by electron crystallography J. Electron Microsc. 48 795-798
[4]  
Leonowicz M.E.(2006)Adsorption of simple gases in MCM-41 materials: the role of surface roughness Langmuir 22 194-202
[5]  
Kresge C.T.(1938)Sorption hysteresis and the vapor pressure of concave surfaces J. Am. Chem. Soc. 60 433-435
[6]  
Schmitt K.D.(1986)Capillary condensation and adsorption in cylindrical and slit-like pores J. Chem. Soc. Faraday Trans. 2 82 1763-1787
[7]  
Chu C.T.-W.(2002)The ins and outs of capillary condensation in cylindrical pores Mol. Phys. 100 2049-2057
[8]  
Olson D.H.(2003)Large cage face-centered-cubic Fm3m mesoporous silica: synthesis and structure J. Phys. Chem. B 107 14296-14300
[9]  
Sheppard E.W.(2007)Lower closure point of adsorption hysteresis in ordered mesoporous silicas Langmuir 23 11021-11026
[10]  
McCullen S.B.(2002)Capillary condensation of nitrogen in MCM-41 and SBA-15 J. Chem. Phys. 117 8036-8041
12345678910