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The hexagonal phase and cylindrical micelles in the system alkyltrimethylammonium bromide-sodium desoxycholate-water as studied by x-ray diffraction and fluorescence quenching
YKI – Ytkemiska institutet.
1996 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 178, 538-548 p.Article in journal (Refereed)
Abstract [en]

The hexagonal (E) liquid-crystaline phase in mixtures of sodium desoxycholate (NaDOC) with the catiorwic surfactant cetyltrimethylammonium bromide (CTAB) in water has been investigated by small-angle X-ray diffraction and optical polarizing microscopy. Large proportions of the dihydroxy bile salt can be incorporated in the E phase of the detergent and lead to a decreasing average radius from 22 Å for pure CTAB to 19.5 Å at 46 mole% of NaDOC. The introduction of the bile salt in the cylinders thus increases the curvature, whereas the same bile salt induces a transition to rod-like micelles when added to spherical CTAB micelles at low surfactant concentration. The mixed E phase was identified and characterized as a hexagonal mesophase by optical polarizing microscopy. The diffusion-limited fluorescence quenching of excited state pyrene by dimethylbenzophenone was investigated in the cylindrical mixed micelles of the micellar (Ll) phase in the same system. The decay curves were evaluated using a model of excited state deactivation in infinitely long rod-like micelles without exchange of quenchers (Almgren, M., Alsins, J., Mukhtar, E., and van Stam, J., J. Phys. Chem. 92, 4479 (1988)) and gave as results the relative diffusion coefficient of the excUed probe and quencher. The addition of DOC- up to an equimolar concentration decreased the diffusion coefficient substantially, indicating an increased rigidity of the micelle.

Place, publisher, year, edition, pages
1996. Vol. 178, 538-548 p.
Keyword [en]
Cationic surfactant, bile salt, hexagonal phase, cylindrical micelles, fluorescence quenching, x-ray diffraction
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26744OAI: oai:DiVA.org:ri-26744DiVA: diva2:1053747
Note
A1027Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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