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|Title:||Comparative analysis of structural and morphological properties of large-pore periodic mesoporous organosilicas and pure silicas|
|Authors:||Bao, X.Y. |
|Source:||Bao, X.Y., Zhao, X.S., Qiao, S.Z., Bhatia, S.K. (2004-10-21). Comparative analysis of structural and morphological properties of large-pore periodic mesoporous organosilicas and pure silicas. Journal of Physical Chemistry B 108 (42) : 16441-16450. ScholarBank@NUS Repository. https://doi.org/10.1021/jp047479s|
|Abstract:||A systematic study on the structural properties and external morphologies of large-pore mesoporous organosilicas synthesized using triblock copolymer EO 20PO 70EO 20 as a template under low-acid conditions was carried out. By employing the characterization techniques of SAXS, FE-SEM, and physical adsorption of N 2 in combination with α s-plot method, the structural properties and external morphologies of large-pore mesoporous organosilicas were critically examined and compared with that of their pure-silica counterparts synthesized under similar conditions. It has been observed that unlike mesoporous pure silicas, the structural and morphological properties of mesoporous organosilicas are highly acid-sensitive. High-quality mesoporous organosilicas can only be obtained from synthesis gels with the molar ratios of HCl/H 2O between 7.08 × 10 -4 and 6.33 × 10 -3, whereas mesoporous pure silicas with well-ordered structure can be obtained in a wider range of acid concentration. Simply by adjusting the HCl/H 2O molar ratios, the micro-, meso-, and macroporosities of the organosilica materials can be finely tuned without obvious effect on their structural order. Such a behavior is closely related to their acid-controlled morphological evolution: from necklacelike fibers to cobweb-supported pearl-like particles and to nanosized particulates.|
|Source Title:||Journal of Physical Chemistry B|
|Appears in Collections:||Staff Publications|
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