Miscibility of Hydrocarbon and Fluorocarbon Surfactants in Adsorbed Film and Micelle

Villeneuve, Masumi; Nomura, Teruko; Matsuki, Hitoshi; Kaneshina, Shoji; Aratono, Makoto

doi:10.1006/jcis.2000.7251

Cited by 18 publications

(22 citation statements)

References 26 publications

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“…23 These differences induce a weak antagonism between the hydrocarbon and uorocarbon chains. [24][25][26][27] In some cases, it was found that the uorocarbon chain is even immiscible with the hydrocarbon one, which causes non-ideal mixing behavior and segregation of the uorocarbon and hydrocarbon surfactants in the mixed system. 28,29 To improve the attraction between the hydrocarbon and uorocarbon chains, introduction of extra inter-molecular forces such as electrostatic interactions between the hydrophilic headgroups is essential.…”

Section: Introductionmentioning

confidence: 99%

Synergism and formation of vesicle gels in salt-free catanionic hydrocarbon/fluorocarbon surfactant mixtures

Yang

Hao

2014

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Synergism and formation of vesicle gels in salt-free catanionic hydrocarbon/fluorocarbon surfactant mixtures

Yang

Hao

2014

RSC Adv.

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“…For instance, the mixture of ammonium perfluorononanoate and ammonium dodecyl sulfate shows only partial mixing at 25 °C [39]. In the systems formed by lithium perfluorooctanesulfonate and lithium dodecyl and tetradecyl sulfate, Villeneuve et al [44] also found an inaccessible composition domain, indicating micellar segregation for the perfluorinated surfactant and each hydrocarbon detergent. In systems with shorter chains, such as sodium decyl sulfate and sodium perfluorooctanoate, several authors claimed there were two different micelles.…”

Section: Aggregation Models In the Mixed Systemsmentioning

confidence: 99%

Aggregation Behavior of Perfluorononanoic Acid/Sodium Dodecyl Sulfate Mixtures

Torres

Rossi

Fernández

2013

J Surfact & Detergents

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The mixed system of an anionic hydrocarbon surfactant, sodium dodecyl sulfate, and a perfluorinated surfactant, perfluorononanoic acid (PFNA), was investigated by a combination of methods. The critical micellar concentrations (CMC) were determined over a wide range of sample compositions by surface tension, conductivity and UV–visible spectrophotometry using N‐(4‐nitrophenyl)perfluorononanamide as a molecular probe. The values of CMC obtained by different techniques were in good agreement. In addition, the aggregation numbers were determined in the mixtures with a low content of hydrocarbon surfactant, by measuring the fluorescence quenching of pyrene. The hydrodynamic radii of the aggregates were estimated through the diffusion ordered 19F‐ and 1H‐NMR spectroscopy. The values obtained are in agreement with those expected according to the measured aggregation numbers. The analysis of the data with different aggregation models suggests the formation of a non‐ideal mixed micelle that is enriched in the perfluorinated surfactant when its mole fraction increases, and that is practically formed by PFNA only at mole fractions higher than 0.8.

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“…35−37 The results are summarized by Villeneuve et al 35 who used surface tension with the Gibbs−Duhem method to determine G E for a nonionic−nonionic mixture and for two pairs of fluorocarbon and hydrocarbon lithium surfactants. For the nonionic mixture, they obtained a slightly unsymmetrical and positive G E with a maximum of about 0.12RT peaking at a fluorocarbon mole fraction of 0.6 at the lowest surface tension measured, a much smaller interaction than present in the micelle.…”

Section: ■ Introductionmentioning

confidence: 99%

“…There are many papers in the literature on micellization, especially concerning the possible segregation of the surfactants, for example, − but apparently only three papers that examine surface adsorption, rather than micellization, in fluorocarbon–hydrocarbon surfactant mixtures. − The results are summarized by Villeneuve et al who used surface tension with the Gibbs–Duhem method to determine G E for a nonionic–nonionic mixture and for two pairs of fluorocarbon and hydrocarbon lithium surfactants. For the nonionic mixture, they obtained a slightly unsymmetrical and positive G E with a maximum of about 0.12 RT peaking at a fluorocarbon mole fraction of 0.6 at the lowest surface tension measured, a much smaller interaction than present in the micelle.…”

Section: Introductionmentioning

confidence: 99%

Unusual Excess Free Energies of Mixing in Mixtures of Partially Fluorinated and Hydrocarbon Surfactants at the Air–Water Interface: Correlation with the Structure of the Layer

et al. 2014

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The air-water interface of three mixtures of partially fluorinated surfactants and hydrocarbon surfactants, C4F9C11H22N(CH3)3Br (fC4hC11TAB) with hexadecyltrimethylammonium bromide (C16TAB), (CF3)2C3F6C10H20N(CH3)3Br (fC5hC10TAB) with C16TAB, and C8F17C6H12N(CH3)3Br (fC8hC6TAB) with C18TAB, have been investigated using surface tension (ST) and neutron reflection (NR). Using the composition of the layer determined by NR, the pseudophase separation model was used to fit the variation of concentration for a specific ST to a free energy of mixing, G(E), that included adjustable quadratic, cubic and quartic terms. In all three cases, G(E) was found to be highly unsymmetrical, being approximately ideal at low surface fractions of hydrocarbon surfactant and repulsive at high fractions with a maximum value of 0.2-0.3RT. The corresponding structure of the layer was also determined by NR and showed that the initial ideal behavior of G(E) probably results from a balance of a gain in energy from a reduced immersion of the fluorocarbon chain, brought about by screening of the fluorocarbon from water by the hydrocarbon surfactant, and a loss from increased fluorocarbon-hydrocarbon repulsion. At higher concentration, there is no space in the layer for further screening and the fluorocarbon-hydrocarbon repulsion leads to the expected positive G(E). The calculated G(E) also indicated that there should be phase separation of the two components in the interface over a bulk composition range of about 60-95% hydrocarbon surfactant. However, experiment indicates no phase separation. It is suggested that there are a number of possible additional negative contributions to G(E) close to a phase transition, which are not possible for a true bulk phase separation, and which prevent surface phase separation unless it is strongly favored.

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Miscibility of Hydrocarbon and Fluorocarbon Surfactants in Adsorbed Film and Micelle

Cited by 18 publications

References 26 publications

Synergism and formation of vesicle gels in salt-free catanionic hydrocarbon/fluorocarbon surfactant mixtures

Synergism and formation of vesicle gels in salt-free catanionic hydrocarbon/fluorocarbon surfactant mixtures

Aggregation Behavior of Perfluorononanoic Acid/Sodium Dodecyl Sulfate Mixtures

Unusual Excess Free Energies of Mixing in Mixtures of Partially Fluorinated and Hydrocarbon Surfactants at the Air–Water Interface: Correlation with the Structure of the Layer

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