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  Phase Behavior and Wall Formation in Zr(SO4)2/CTABr and TiOSO4/CTABr Mesophases

Linden, M., Blanchard, J., Schacht, S., Schunk, S., & Schüth, F. (1999). Phase Behavior and Wall Formation in Zr(SO4)2/CTABr and TiOSO4/CTABr Mesophases. Chemistry of Materials, 11(10), 3002-3008. doi:10.1021/cm991082x.

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 Creators:
Linden, Mika1, 2, Author              
Blanchard, Juliette3, Author
Schacht, Stefan3, Author
Schunk, S.2, Author              
Schüth, Ferdi2, Author              
Affiliations:
1Department of Physical Chemistry, Åbo Akademi, Portansgatan 3-5, 20500 Turku, Finland, ou_persistent22              
2Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              
3Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim, Germany , ou_persistent22              

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 Abstract: The phase behavior of Zr(SO4)2/CTABr composite mesophases was investigated as a function of surfactant chain length, temperature, and salt concentration by XRD. It was shown that the initial step is a rapid formation of either a pure lamellar, hexagonal, or a mixed hexagonal/lamellar phase with a low degree of condensation (room temperature), depending on the chain length of the surfactant as well as on the ionic strength of the solution. The observed features may be qualitatively explained by expected variations in the packing parameter. TiOSO4/CTABr composite mesophases were shown to form in a similar manner as Zr(SO4)2/CTABr. A model accounting for changes in the inorganic framework with increasing degree of intraaggregate condensation was developed. Furthermore, using a tubular reactor setup connected to an in situ XRD cell it was shown that the mesophase formation occurred immediately (<300 ms) after mixing of the reagents, which is the fastest ever recorded composite mesophase formation.

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Language(s): eng - English
 Dates: 1999-09-111999
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/cm991082x
 Degree: -

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Title: Chemistry of Materials
  Other : Chem. Mater.
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Chemical Society
Pages: - Volume / Issue: 11 (10) Sequence Number: - Start / End Page: 3002 - 3008 Identifier: ISSN: 0897-4756
CoNE: https://pure.mpg.de/cone/journals/resource/954925561571