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Periodic Mesoporous Organosilica in Confined Environments
Author(s) -
Keilbach Andreas,
Döblinger Markus,
Köhn Ralf,
Amenitsch Heinz,
Bein Thomas
Publication year - 2009
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200802216
Subject(s) - mesophase , small angle x ray scattering , materials science , mesoporous material , transmission electron microscopy , mesoporous organosilica , crystallography , lyotropic , discotic liquid crystal , mesoporous silica , chemical engineering , liquid crystal , organic chemistry , scattering , nanotechnology , chemistry , liquid crystalline , physics , optoelectronics , engineering , optics , catalysis
Confined tubes : Periodic mesoporous organosilica (PMO) mesophases were synthesized within the confined tubular environment of anodic alumina membrane (AAM) channels, resulting in the formation of either the hexagonal circular or the cubic mesophase.Periodic mesoporous organosilica (PMO) mesophases based on bis(triethoxysilyl)ethane (BTSE) were synthesized within the confined tubular environment of anodic alumina membrane (AAM) channels. The resulting mesophases were investigated by transmission small angle X‐ray scattering (SAXS), nuclear magnetic resonance (NMR), nitrogen sorption, and transmission electron microscopy (TEM). Two different surfactants—nonionic Brij 56 and ionic cetyltrimethylammonium bromide (CTAB)—were used in an acid‐catalyzed evaporation‐induced self‐assembly (EISA) process. Brij 56 as the structure‐directing agent (SDA) resulted in the formation of either the hexagonal circular or the cubic mesophase. While the hexagonal circular mesophase is common for such kinds of composites, the cubic mesophase has never been reported before. The template could be removed from the mesophases by template extraction and calcination after annealing the samples. When using CTAB as the SDA during EISA, the only mesophase observed was the hexagonal circular structure. This is in contrast to previous experiments and reports on pure silica mesophases, where the only mesophase formed with CTAB is hexagonal columnar.

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