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On the Formation of Discoidal versus Threadlike Micelles in Dilute Aqueous Surfactant/Lipid Systems
Department of Physical and Analytical Chemistry, Physical Chemistry, Uppsala University.
Department of Physical and Analytical Chemistry, Physical Chemistry, Uppsala University.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
Department of Physical and Analytical Chemistry, Physical Chemistry, Uppsala University.
2008 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 24, no 5, 1731-1739 p.Article in journal (Refereed) Published
Abstract [en]

In a recent study, we showed that the surfactant 1,2-distearoyl-sn-glycero-3-phosphatidylethanolamine-N-[methoxy(polyethylene glycol)-2000 (DSPE-PEG2000) induced mixed micelles of either threadlike or discoidal shape when mixed with different types of lipids. In this study, we have exchanged the PEG−lipid for the more conventional surfactants octaethylene glycol monododecyl ether (C12E8), hexadecyltrimethylammonium bromide (CTAB), and sodium dodecyl sulfate (SDS). Cryo-TEM investigations show that also these surfactants are able to induce the formation of long-lived discoidal micelles. Generally, the preference for either discoidal or threadlike micelles can be tuned by the choice of lipids and environmental conditions in much the same way as observed for the lipid/PEG−lipid system. Our investigation showed, furthermore, that the choice of surfactant may influence the type of mixed micelles formed. It is argued that the formation of discoidal rather than threadlike micelles may be rationalized as an effect of increasing bending rigidity. Our detailed theoretical model calculations show that the bending rigidity becomes significantly raised for aggregates formed by an ionic rather than a nonionic surfactant.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2008. Vol. 24, no 5, 1731-1739 p.
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Natural Sciences
Identifiers
URN: urn:nbn:se:kth:diva-58924DOI: 10.1021/la702637hISI: 000253460200030OAI: oai:DiVA.org:kth-58924DiVA: diva2:474392
Note
QC 20120123Available from: 2012-01-23 Created: 2012-01-09 Last updated: 2017-12-08Bibliographically approved

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