New Microporous and Mesoporous Materials: Elucidation of Their Structures by Electron Microscopy |
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Authors: | Osamu Terasaki Tetsu Ohsuna Shinji Inagaki |
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Affiliation: | (1) Department of Physics and CIR, Tohoku University, Sendai, 980-8578, Japan;(2) CREST, Japan Science and Technology Corporation, Tohoku University, Sendai, 980-8578, Japan;(3) Institute for Materials Research (IMR), Tohoku University, Sendai, 980-8577, Japan;(4) Toyota Central R&D Labs., Inc., Nagakute, Aichi, 480-1192, Japan |
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Abstract: | We have recently published three papers (P. Wagner et al., Phys. Chem. 103 (1999) 8245; S. Inagaki et al., J. Am. Chem. Soc. 121 (1999) 9611; A. Carlsson et al., J. Electron Microscopy 48 (1999) 795) that herald a new approach to structural solutions in micro- and mesoporous solid state materials. Among these materials are the first hybrid inorganic–organic mesoporous materials, synthesized using the organosilane compound 1,2-bis(trimethoxysilyl) ethane (BTME). Both organic and inorganic fragments are distributed completely uniformly at the molecular scale in the mesoporous walls. Two distinct phases with two- and three-dimensional (2d- and 3d-) hexagonal periodic pore-arrangements have been detected. We have also recently reported another new cubic hybrid phase with a decaoctahedral crystal morphology. Two new approaches for solving the structures of porous materials from either electron diffraction (ED) or high-resolution electron microscope (HREM) observations have also been developed. The former was successfully applied by combining direct methods for structural analysis of the new microporous crystal SSZ-48, which crystallizes only in very small crystals. The latter technique was applied to 3d-structural analysis of the mesoporous material MCM-48. The structure solutions, in the latter case, are obtained uniquely without preassumed models or parameterization, unlike previous reports. |
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Keywords: | microporous and mesoporous materials electron microscope inorganic– organic hybrid materials electron crystallography |
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