Mixtures of Hydrogenated and Fluorinated Lactobionamide Surfactants with Cationic Surfactants: Study of Hydrogenated and Fluorinated Chains Miscibility through Potentiometric Techniques
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- 作者：Vé ; ronique Peyre ; Sandeep Patil ; Gré ; gory Durand ; Bernard Pucci
- 刊名：Langmuir
- 出版年：2007
- 出版时间：November 6, 2007
- 年：2007
- 卷：23
- 期：23
- 页码：11465 - 11474
- 全文大小：170K
- 年卷期：v.23,no.23(November 6, 2007)
- ISSN：1520-5827
文摘
The work reported herein deals with the aqueous behavior of hydrocarbon and/or fluorocarbon ionic and nonionicsurfactants mixtures. These mixtures were studied using potentiometric techniques in NaBr (0.1 mol L-1) aqueoussolution as well as in pure water. Mixed micelles were formed from a cationic surfactant (dodecyl ortetradecyltrimethylammonium bromide respectively called DTABr or TTABr) and neutral lactobionamide surfactants bearing a hydrogenated dodecyl chain (H12Lac) or a fluorinated chain (CF3-(CF2)5-(CH2)2- or CF3-(CF2)7-(CH2)2-). We showed that concentrations of ionic and nonionic surfactants in the monomeric form as well as thecomposition of the mixed micelles can be specified thanks to a potentiometric technique. The complete characterizationdoes not request any model of micellization a priori. The activities of the micellar phase constituents, as well as thefree enthalpies of mixing, were calculated. The subsequent interpretation only relies on the experimental characterization.Comparison of the behaviors of the various systems with a model derived from the regular solution theory revealsthe predominant part of electrostatic interactions in the micellization phenomenon. It also appears that the energy ofinteraction between hydrogenated and fluorinated chains is unfavorable to mixing and is of much lower magnitudethan the electric charges interactions.