Aqueous Microemulsions of a Fluorinated Surfactant and Oil Studied by PFG-NMR: Transformation from Threadlike to Spherical Micelles
The aqueous microemulsion system consisting of the fluorinated surfactant tetraethylammonium perfluorooctylsulfonate (TEAFOS) and the fluorinated oil 1H-perfluorohexane (PFH) has been investigated using the pulsed field gradient NMR self-diffusion method on both 1H and 19F. Neat TEAFOS(aq) builds th...
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Veröffentlicht in: | Langmuir 2004-01, Vol.20 (2), p.336-341 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The aqueous microemulsion system consisting of the fluorinated surfactant tetraethylammonium perfluorooctylsulfonate (TEAFOS) and the fluorinated oil 1H-perfluorohexane (PFH) has been investigated using the pulsed field gradient NMR self-diffusion method on both 1H and 19F. Neat TEAFOS(aq) builds threadlike micelles from rather low surfactant concentrations up to ca. 80 mmol kg-1. The addition of PFH to TEAFOS(aq) solutions induces a transition from threadlike micelles to spherical micelles solubilizing the oil. In this paper, information from the self-diffusion coefficients of oil (PFH), surfactant counterion (TEA+), surfactant ion (FOS-), and water (HDO) during the transition is presented. |
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ISSN: | 0743-7463 1520-5827 |
DOI: | 10.1021/la035399u |