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Phase Equilibria of the Mixed Didodecyldimethylammonium Bromide-Taurodeoxycholate-Water System with a Large Solution Region.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
Responsible organisation
2005 (English)In: Colloids and Surfaces, ISSN 0166-6622, Vol. 269, no 1-3, 87-95 p.Article in journal (Refereed) Published
Abstract [en]

The phase behavior over the entire concentration range for the system didodecyldimethylammonium bromide (DDAB)-sodium taurodeoxycholate (STDC)-water, at 25 degrees C, has been investigated, with emphasis on the DDAB-rich part. Polarizing microscopy, SAXS, H-2 NMR and H-1 self-diffusion NMR have been used in combination as probing techniques for phase behavior and microstructure. The system forms four major phases, all deriving from the respective binary surfactant systems. The two lamellar phases originating from the binary DDAB-water axis (D-I and D-II, at 3-30 and 83-91 wt.% DDAB, respectively) are only able to incorporate small amounts of STDC. The D-II phase solubilizes a comparatively higher amount of bile salt (up to ca. 6 wt.%), while the D, phase takes up less than 0.25 wt.%. From the STDC-water axis, a solution phase and a "hexagonal-like" liquid crystalline phase are derived, at 0-26 and 37-60 wt.% of STDC, respectively. Heterogeneous regions are also indicated on the basis of NMR and SAXS data. The most striking feature is the large extension of the isotropic solution phase, which originates from the water corner and curves toward the DDAB-rich side of the phase diagram. Even though at the upper limit of the solution phase the amount of water is reduced to 10 wt.%, the measured water and DDAB self-diffusion coefficients exclude the possibility of reverse-type structures.

Place, publisher, year, edition, pages
2005. Vol. 269, no 1-3, 87-95 p.
Keyword [en]
Surfactant
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:miun:diva-3741DOI: 10.1016/j.colsurfa.2005.06.066ISI: 000233262200012Local ID: 4013OAI: oai:DiVA.org:miun-3741DiVA: diva2:28773
Note
VR-ChemistryAvailable from: 2008-09-30 Created: 2009-06-08 Last updated: 2009-11-02Bibliographically approved

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Bydén Sjöbom, MalinEdlund, Håkan
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CiteExportLink to record
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Citation style
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