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  Influence of cosurfactants on the properties of mesostructured materials

Kleitz, F., Blanchard, J., Zibrowius, B., Schüth, F., Ågren, P., & Lindén, M. (2002). Influence of cosurfactants on the properties of mesostructured materials. Langmuir, 18(12), 4963-4971. doi:10.1021/la020013l.

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Kleitz, F.1, Author              
Blanchard, J.2, Author
Zibrowius, B.3, Author              
Schüth, F.1, Author              
Ågren, P.1, Author              
Lindén, M.1, Author              
Affiliations:
1Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              
2Abo Akad Univ, Dept Chem Phys, FIN-20500 Turku, Finland, ou_persistent22              
3Service Department Farès (NMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445623              

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 Abstract: The effects of the addition of two different types of cosurfactants, n-alkylamine and n-alkyl alcohol, on he phase behavior of silicate-surfactant mesophases and the pore size of the calcined materials have been investigated using X-ray diffraction, N-2-sorption, TG-MS, and solid state H-1 and C-13 NMR spectroscopy. The cosurfactants were added to a standard room-temperature synthesis, which results in a MCM-41 type, hexagonally ordered material in the absence of cosurfactant. Their addition led either to an increase or a decrease of the pore size and d spacing of the hexagonal mesophase, depending on the nature of the polar headgroup and on the chain length of the cosurfactant. For high cosurfactant/surfactant ratios, however, a transition to a lamellar phase was usually observed. The d spacing and the pore size of the hexagonal mesophase can be decreased considerably down to the supermicropore range by addition of butylamine without a marked decrease in the long- range order of the material. The addition of alcohol, on the other hand, resulted in an increase in the d spacing of the hexagonal phase by up to 3 Angstrom. These results are discussed in terms of differences in the ability of the cosurfactants to interact with the silicate as well as cosurfactant-induced changes in the packing parameter.

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Language(s): eng - English
 Dates: 2002-06-11
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 20096
DOI: 10.1021/la020013l
ISI: 000176091900061
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Title: Langmuir
  Alternative Title : Langmuir
Source Genre: Journal
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Pages: - Volume / Issue: 18 (12) Sequence Number: - Start / End Page: 4963 - 4971 Identifier: ISSN: 0743-7463