Kinetics of cosurfactant-surfactant-silicate phase behavior. 2. Short-chain amines

Patrik Ågren, Mika Lindén, Jarl B. Rosenholm, Juliette Blanchard, Ferdi Schüth, Heinz Amenitsch

Research output: Contribution to journalArticleScientificpeer-review

34 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)8809-8813
Number of pages5
JournalLangmuir
Volume16
Issue number23
DOIs
Publication statusPublished - 2000
MoE publication typeA1 Journal article-refereed

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