Adsorption and Thermogravimetric Methods for Monitoring Surface and Structural Changes in Ordered Mesoporous Silicas Induced by their Chemical Modification
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The current work demonstrates that the standard adsorption analysis has a limited applicability for characterization of chemically modified porous silicas. Since low-pressure nitrogen adsorption isotherms are sensitive to the surface changes caused by chemical modification of silicas, these isotherms were successfully used to evaluate their surface heterogeneity during different stages of modification. The surface analysis was accomplished by using adsorption energy distributions and high-resolution comparative plots.
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- Gregg, S.J. and K.S.W. Sing, Adsorption, Surface Area and Porosity, Academic Press, London, 1982.Google Scholar
- Jaroniec, M. and R. Madey, Physical Adsorption on Heterogeneous Solids, Elsevier, Amsterdam, 1988.Google Scholar
- Jaroniec, C.P., R.K. Gilpin, and M. Jaroniec, “Adsorption and Thermogravimetric Studies of Silica-Based Amide Bonded Phases,” J. Phys. Chem. B, 101, 6861–6866 (1997).Google Scholar
- Jaroniec, M. and K. Kaneko, “Physicochemical Foundations for Characterization of Adsorbents by Using High-Resolution Comparative Plots,” Langmuir, 13, 6589–6596 (1997).Google Scholar
- Kruk, M., M. Jaroniec, R.K. Gilpin, and Y.W. Zhou, “Nitrogen Adsorption Studies of Coated and Chemically Modified Chromatographic Silica Gels,” Langmuir, 13, 545–550 (1997a).Google Scholar
- Kruk, M., M. Jaroniec, R. Ryoo, and J.M. Kim, “Monitoring of the Structure of Siliceous Mesoporous Molecular Sieves Tailored Using Different Synthesis Conditions,” Microporous Materials, 12, 93–106 (1997b).Google Scholar
- Kruk, M., M. Jaroniec, and A. Sayari, “Application of Large Pore MCM-41 Molecular Sieves to Improve Pore Size Analysis Using Nitrogen Adsorption Measurements,” Langmuir, 13, 6267–6273 (1997c).Google Scholar
- Kruk, M. and M. Jaroniec, “Surface and Structural Properties of Modified Porous Silicas,” Surfaces of Nanoparticles and Porous Materials, J.A. Schwarz and C. Contescu (Eds.), pp. 443–472, Marcel Dekker, New York, 1999.Google Scholar
- Sayari, A., “Periodic Mesoporous Materials: Synthesis, Characterization and Potential Applications,” Recent Advances and New Horizons in Zeolite Science and Technology, H. Chon, S.L. Woo, and S.-E. Park (Eds.), pp. 1–46, Elsevier, Amsterdam, 1996.Google Scholar
- Szombathely, M.V., P. Brauer, and M. Jaroniec, “The Solution of Adsorption Integral Equations by Means of the Regularization Method,” J. Computational Chem., 13, 17–32 (1992).Google Scholar