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          Institute: MPI für Kohlenforschung     Collection: Publikationen MPI für Kohlenforschung     Display Documents



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ID: 20154.0, MPI für Kohlenforschung / Publikationen MPI für Kohlenforschung
Controlled solubilization of toluene by silicate-catanionic surfactant mesophases as studied by in situ and ex situ XRD
Authors:Lind, A.; Andersson, J.; Karlsson, S.; Ågren, P.; Bussian, P.; Amenitsch, H.; Lindén, M.
Language:English
Date of Publication (YYYY-MM-DD):2002-02-19
Title of Journal:Langmuir
Journal Abbrev.:Langmuir
Volume:18
Issue / Number:4
Start Page:1380
End Page:1385
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Mesoscopically ordered silicate-surfactant composite materials of the M41S type synthesized in the presence of a swollen agent have been characterized by in situ and ex situ X-ray diffraction analysis. The key feature of the room-temperature synthesis is the use of a mixture of cationic and anionic surfactants as structure-directing agents. The lower interfacial charge density of the mixed surfactant aggregates stabilizes structures of lower interfacial curvature and therefore facilitates a more controlled solubilization of organic swelling agents. An increased solubilization capacity of the catanionic surfactant-silicate mesophase was observed close to an anionic/cationic surfactant ratio corresponding to a transition to the lamellar phase in the absence of toluene. In the presence of toluene, the catanionic template stabilizes microemulsion droplets that serve as building blocks for the final material. However, a fair amount of organic compound is solubilized in the silica-catanionic surfactant composite after the mesophase is formed. Although the present communication concerns mesoporous silica, the concept is a general one and may allow the synthesis of non-siliceous large-pore materials.
Comment of the Author/Creator:Date: 2002, FEB 19
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Kohlenforschung
External Affiliations:Abo Akad Univ, Dept Phys Chem, Porthansgatan 3-5, FIN-20500; Turku, Finland; Austrian Acad Sci, Inst Biophys & Xray Struct Res, A-8042 Graz, Austria
Identifiers:ISI:000174009300063 [ID No:1]
ISSN:0743-7463 [ID No:2]
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