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Periodic Mesoporous Organosilica in Confined Environments

  1. Andreas Keilbach1,
  2. Markus Döblinger Dr.1,
  3. Ralf Köhn Dr.1,
  4. Heinz Amenitsch Dr.2,
  5. Thomas Bein Prof. Dr.1

Article first published online: 26 MAY 2009

DOI: 10.1002/chem.200802216

Issue

Chemistry - A European Journal

Chemistry - A European Journal

Volume 15, Issue 27, pages 6645–6650, July 6, 2009

Additional Information

How to Cite

Keilbach, A., Döblinger, M., Köhn, R., Amenitsch, H. and Bein, T. (2009), Periodic Mesoporous Organosilica in Confined Environments. Chem. Eur. J., 15: 6645–6650. doi: 10.1002/chem.200802216

Author Information

  1. 1

    Department of Chemistry and Biochemistry and Center for NanoScience (CeNS), University of Munich, Butenandtstrasse 5–13 (E), 81377 Munich (Germany), Fax: (+49)-89-2180-77622)

  2. 2

    Institute for Biophysics and Nanosystems Research, Austrian Academy of Sciences, Schmiedlstr. 6, 8042 Graz (Austria)

Publication History

  1. Issue published online: 29 JUN 2009
  2. Article first published online: 26 MAY 2009
  3. Manuscript Received: 26 OCT 2008

Funded by

  • Deutsche Forschungsgemeinschaft. Grant Number: SFB 486
  • Nanosystems Initiative Munich (NIM Cluster)

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Keywords:

  • mesoporous materials;
  • organosilica;
  • surfactants

Abstract

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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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