Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 15, Issue 42, Pages 11319-11325Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200802716
Keywords
helical structures; mesoporous materials; self-assembly; surfactants
Categories
Funding
- State Key Research Program [2004CB217804, 2006CB932302]
- NSF of China [20721063]
- Science & Technology Commission of Shanghai Municipality [08DZ2270500]
- SLADP [B108, B113]
- Ministry of Education of China [20060246010]
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This study systematically investigates periodic mesoporous organosilicas (PMOs) with controlled helical and concentric circular (CC) pore architectures prepared through a basic-catalyzed sol-gel process by using an achiral cationic surfactant trimethyl-octadecylammonium bromide (C(18)TAB) as a structure-directing agent, perfluorooctanoic acid (PFOA) as an additive, and 1,2-bis(triethoxysilyl)ethane (BTEE) as a hybrid silica precursor. By increasing the weight ratio of PFOA/C(18)TAB, a pore architecture transition of PMO materials from hexagonal-arrayed, straight longitudinal channels to helical and CC mesostructures is achieved; such a transition has not been observed before in PMO materials. Our discovery is helpful in understanding the supramolecular cooperative assembly of hybrid materials and their structural and morphological evolution, which are important in the future applications of PMO materials.
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