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Kinetics of Cosurfactant−Surfactant−Silicate Phase Behavior. 2. Short-Chain Amines

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Ågren,  P.
Department of Physical Chemistry, Åbo Akademi University, Porthaninkatu 3-5, FIN-20500 Turku, Finland ;
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Linden,  Mika
Department of Physical Chemistry, Åbo Akademi University, Porthaninkatu 3-5, FIN-20500 Turku, Finland ;
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

Blanchard,  Juliette
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Schüth,  Ferdi
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Ågren, P., Linden, M., Rosenholm, J. B., Blanchard, J., Schüth, F., & Amenitsch, H. (2000). Kinetics of Cosurfactant−Surfactant−Silicate Phase Behavior. 2. Short-Chain Amines. Langmuir, 16(23), 8809-8813. doi:10.1021/la000402k.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0024-3BDF-D
Abstract
The influence of added short-chain amines, n-butylamine, BA, and n-octylamine, OA, on the mesophase formation of surfactant−silicate composite structures in a room-temperature synthesis has been investigated in situ by synchrotron small-angle X-ray scattering. For BA a marked decrease in the d spacing of the hexagonal phase was observed with increasing amine concentration, while a slight increase in d spacing was initially observed for OA. However, the d spacing of the hexagonal phase went through a maximum with increasing concentration. Furthermore, two coexisting hexagonal phases or a purely lamellar phase was observed if the concentration of OA was increased further. The results are discussed in terms of two competing mechanisms of amine incorporation:  solubilization within the CTAB−silicate mesophase and competitive adsorption of the amine to the silicate.