Improvement of the Derjaguin-Broekhoff-De Boer theory for capillary condensation/evaporation of nitrogen in mesoporous systems and its implications for pore size analysis of MCM-41 silicas and related materials

Kowalczyk, P, Jaroniec, M, Terzyk, A, Keneko, K and Do, D 2005, 'Improvement of the Derjaguin-Broekhoff-De Boer theory for capillary condensation/evaporation of nitrogen in mesoporous systems and its implications for pore size analysis of MCM-41 silicas and related materials', Langmuir, vol. 21, no. 5, pp. 1827-1833.


Document type: Journal Article
Collection: Journal Articles

Title Improvement of the Derjaguin-Broekhoff-De Boer theory for capillary condensation/evaporation of nitrogen in mesoporous systems and its implications for pore size analysis of MCM-41 silicas and related materials
Author(s) Kowalczyk, P
Jaroniec, M
Terzyk, A
Keneko, K
Do, D
Year 2005
Journal name Langmuir
Volume number 21
Issue number 5
Start page 1827
End page 1833
Total pages 7
Publisher American Chemical Society
Abstract In this work, we propose an improvement of the classical Derjaguin-Broekhoff-de Boer (DBdB) theory for capillary condensation/evaporation in mesoporous systems. The primary idea of this improvement is to employ the Gibbs-Tolman-Koenig-Buff equation to predict the surface tension changes in mesopores. In addition, the statistical film thickness (so-called t-curve) evaluated accurately on the basis of the adsorption isotherms measured for the MCM-41 materials is used instead of the originally proposed t-curve (to take into account the excess of the chemical potential due to the surface forces). It is shown that the aforementioned modifications of the original DBdB theory have significant implications for the pore size analysis of mesoporous solids. To verify our improvement of the DBdB pore size analysis method (IDBdB), a series of the calcined MCM-41 samples, which are well-defined materials with hexagonally ordered cylindrical mesopores, were used for the evaluation of the pore size distributions. The correlation of the IDBdB method with the empirically calibrated Kruk-Jaroniec-Sayari (KJS) relationship is very good in the range of small mesopores. So, a major advantage of the IDBdB method is its applicability for small mesopores as well as for the mesopore range beyond that established by the KJS calibration, i.e., for mesopore radii greater than ~4.5 nm. The comparison of the IDBdB results with experimental data reported by Kruk and Jaroniec for capillary condensation/evaporation as well as with the results from nonlocal density functional theory developed by Neimark et al. clearly justifies our approach. Note that the proposed improvement of the classical DBdB method preserves its original simplicity and simultaneously ensures a significant improvement of the pore size analysis, which is confirmed by the independent estimation of the mean pore size by the powder X-ray diffraction method.
Subject Physical Chemistry not elsewhere classified
DOI - identifier 10.1021/la047645n
ISSN 0743-7463
Versions
Version Filter Type
Citation counts: Scopus Citation Count Cited 32 times in Scopus Article | Citations
Altmetric details:
Access Statistics: 114 Abstract Views  -  Detailed Statistics
Created: Mon, 06 Dec 2010, 14:11:00 EST by Catalyst Administrator
© 2014 RMIT Research Repository • Powered by Fez SoftwareContact us