Document Detail


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.
MedLine Citation:
PMID:  15723478     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
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 approximately 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.
Authors:
Piotr Kowalczyk; Mietek Jaroniec; Artur P Terzyk; Katsumi Kaneko; Duong D Do
Related Documents :
15245848 - Using radiotracer techniques for coastal hydrodynamic model evaluation.
20207188 - Spherical wavelet transform for odf sharpening.
20464978 - Nanostructured biocides for means of rehabilitation.
23182468 - Evaluation of growth models for follicle development and ovulation in lusitano mares.
3467558 - Experimental models of head injury.
17362338 - Developmental time and size-related traits in drosophila buzzatii along an altitudinal ...
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Langmuir : the ACS journal of surfaces and colloids     Volume:  21     ISSN:  0743-7463     ISO Abbreviation:  Langmuir     Publication Date:  2005 Mar 
Date Detail:
Created Date:  2005-02-22     Completed Date:  2006-06-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882736     Medline TA:  Langmuir     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1827-33     Citation Subset:  -    
Affiliation:
Department of Chemistry, Faculty of Science, Chiba University, 1-3 Yayoi, Chiba, 263, Japan. pkow@pchem2.s.chiba-u.ac.jp
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Analysis of the pressure-induced potential arising through composite membranes with selective surfac...
Next Document:  Silica surfaces lubrication by hydrated cations adsorption from electrolyte solutions.