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• W1975915589 abstract "A unified interpretation is presented for high-temperature (ca. 423 K) unit-cell enlargement of MCM-41 synthesized in the presence of cetyltrimethylammonium (CTMA+) surfactants without auxiliary organics. Such processes during postsynthesis hydrothermal treatments and direct syntheses were reported by several research groups to afford large-unit-cell (d spacing up to 7 nm) and large-pore (up to 7 nm) MCM-41 materials, but their structures were claimed to be different and the proposed mechanisms of the processes were not consistent with each other. The current study demonstrates significant structural similarities of large-pore MCM-41 materials prepared using direct syntheses and postsynthesis treatments, reveals the common mechanism of their formation, and discusses its implications for preparation of large-pore materials, including new synthesis procedures. The proposed comprehensive description of the mechanism of the unit-cell-enlargement processes involves the in situ generation of N,N-dimethylhexadecylamine (DMHA) and its swelling action as a driving force of the pore size enlargement. The swelling properties of DMHA were confirmed by a successful synthesis of large-pore MCM-41 in mild conditions in the presence of DMHA and preparation of silicas with pore sizes up to 11 nm and extremely large-pore volumes up to 2.4 cm3/g via restructuring of 3.5 nm MCM-41 in aqueous emulsions of long-chain amines (dimethyldecylamine or DMHA). The neutral amine is formed during the high-temperature processes as a result of decomposition of CTMA+ cations, which is likely to be accompanied by migration of tetramethylammonium cations (TMA+) to the silica−surfactant interface or is possibly related with replacement of CTMA+ by TMA+ at the interface. The reasons for the pore volume increase and surface area decrease during the pore size enlargement are discussed. Moreover, it is suggested that the unit-cell expansion in the direction perpendicular to the pore channels is accompanied by shrinkage of the structure in the direction parallel to the channels." @default.
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• W1975915589 date "1999-05-04" @default.
• W1975915589 modified "2023-10-17" @default.
• W1975915589 title "A Unified Interpretation of High-Temperature Pore Size Expansion Processes in MCM-41 Mesoporous Silicas" @default.
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• W1975915589 doi "https://doi.org/10.1021/jp9844258" @default.
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