Morishige Kunimitsu, Tateishi Masayoshi
Department of Chemistry, Okayama University of Science, 1-1 Ridai-cho, Okayama 700-0005, Japan.
Langmuir. 2006 Apr 25;22(9):4165-9. doi: 10.1021/la053105u.
To examine the theoretical and semiempirical relations between pore size and the pressure of capillary condensation or evaporation proposed so far, we constructed an accurate relation between the pore radius and the capillary condensation and evaporation pressure of nitrogen at 77 K for the cylindrical pores of the ordered mesoporous MCM-41 and SBA-15 silicas. Here, the pore size was determined from a comparison between the experimental and calculated X-ray diffraction patterns due to X-ray structural modeling recently developed. Among the many theoretical relations that differ from each other in the degree of theoretical improvements, a macroscopic thermodynamic approach based on Broekhoff-de Boer equations was found to be in fair agreement with the experimental relation obtained in the present study.
为了检验目前提出的孔径与毛细凝聚或蒸发压力之间的理论和半经验关系，我们针对有序介孔MCM - 41和SBA - 15二氧化硅的圆柱形孔，构建了77K下孔半径与氮气毛细凝聚和蒸发压力之间的精确关系。在此，通过最近开发的X射线结构建模，根据实验和计算的X射线衍射图谱之间的比较来确定孔径。在众多理论改进程度不同的理论关系中，发现基于布罗克霍夫 - 德布尔方程的宏观热力学方法与本研究中获得的实验关系相当吻合。
