Application of Large Pore MCM-41 Molecular Sieves To Improve Pore Size Analysis Using Nitrogen Adsorption Measurements (Record no. 44194)
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| fixed length control field | 02278nam a2200193Ia 4500 |
| 003 - CONTROL NUMBER IDENTIFIER | |
| control field | MX-MdCICY |
| 005 - DATE AND TIME OF LATEST TRANSACTION | |
| control field | 20250625140622.0 |
| 040 ## - CATALOGING SOURCE | |
| Transcribing agency | CICY |
| 090 ## - LOCALLY ASSIGNED LC-TYPE CALL NUMBER (OCLC); LOCAL CALL NUMBER (RLIN) | |
| Classification number (OCLC) (R) ; Classification number, CALL (RLIN) (NR) | B-9951 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION | |
| fixed length control field | 250602s9999 xx |||||s2 |||| ||und|d |
| 245 10 - TITLE STATEMENT | |
| Title | Application of Large Pore MCM-41 Molecular Sieves To Improve Pore Size Analysis Using Nitrogen Adsorption Measurements |
| 490 0# - SERIES STATEMENT | |
| Volume/sequential designation | Langmuir, 13(23), p.6267-6273, 1997 |
| 520 3# - SUMMARY, ETC. | |
| Summary, etc. | MCM-41 siliceous molecular sieves were used to test the applicability of the Kelvin equation for nitrogen adsorption in cylindrical pores of the size from 2 to 6.5 nm. It was shown that the Kelvin equation for the hemispherical meniscus, corrected for the statistical film thickness, is in quite good agreement with an experimental relation between the pore size and the capillary condensation pressure. The agreement can be made quantitative in the pore size range from ca. 2 to 6.5 nm, if a simple correction to the Kelvin equation is introduced. The required statistical film thickness curve (t-curve)was calculated using nitrogen adsorption data for large pore MCM-41 samples and the obtained results were extrapolated using an adsorption isotherm for a macroporous silica gel. Moreover, an accurate analytical representation of the t-curve was found. Since both the corrected Kelvin equation for cylindrical pores and the t-curve have simple analytical forms, they can conveniently be used in a variety of methods to evaluate porosity. It was shown that the BJH method with the corrected Kelvin equation accurately reproduces pore sizes of MCM-41 materials. A comparison was made between the specific surface areas for the MCM-41 samples calculated on the basis of the BET equation and those obtained using other independent methods. The results strongly suggest that when nitrogen adsorption data are used, the BET method overestimates the specific surface area of siliceous materials. The latter conclusion was supported by the examination of the obtained statistical film thickness curve. |
| 700 12 - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Kruk, M. |
| 700 12 - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Jaroniec, M. |
| 700 12 - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Sayari, A. |
| 856 40 - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | <a href="https://drive.google.com/file/d/1Jojr_iJzT2MHyll9iqG0F7cFtYo6KKLW/view?usp=drivesdk">https://drive.google.com/file/d/1Jojr_iJzT2MHyll9iqG0F7cFtYo6KKLW/view?usp=drivesdk</a> |
| Public note | Para ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Source of classification or shelving scheme | Clasificación local |
| Koha item type | Documentos solicitados |
| Lost status | Source of classification or shelving scheme | Damaged status | Not for loan | Collection | Home library | Current library | Shelving location | Date acquired | Total checkouts | Full call number | Date last seen | Price effective from | Koha item type |
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| Clasificación local | Ref1 | CICY | CICY | Documento préstamo interbibliotecario | 25.06.2025 | B-9951 | 25.06.2025 | 25.06.2025 | Documentos solicitados |