کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5369706 | 1388451 | 2007 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Applicability of classical methods of pore size analysis for MCM-41 and SBA-15 silicas Applicability of classical methods of pore size analysis for MCM-41 and SBA-15 silicas](/preview/png/5369706.png)
Two most popular ordered mesoporous silicas, MCM-41 and SBA-15, exhibiting uniform mesopores of approximately cylindrical shapes, have been used as model adsorbents for verification, improvement and/or development of adsorption-based methods for characterization nanoporous materials. While the applicability of the classical methods for pore size analysis was widely examined by employing MCM-41 materials, the large-pore materials such as SBA-15 did not find adequate usage for this type of studies. The current work addresses the issue of applicability of classical methods such as Barrett-Joyner-Hallenda (BJH) and Broekhoff-de Boer (BdB) methods for pore size analysis of mesoporous silicas by using MCM-41 and SBA-15 materials as model adsorbents. In addition, the Kruk-Jaroniec-Sayari (KJS) method, which is based on the BJH algorithm and experimental relations for the pore width and statistical film thickness, is discussed too. While the MCM-41 materials cover the range of small mesopores (about 2-7Â nm), the inclusion of SBA-15 materials allowed us to examine the range of the pore diameters up to about 12Â nm. The high quality MCM-41 and SBA-15 samples are used to discuss the applicability and limitations of the aforementioned characterization methods and to propose some recommendations for pore size analysis of these materials.
Journal: Applied Surface Science - Volume 253, Issue 13, 30 April 2007, Pages 5587-5590