A study of fluorocarbon-hydrocarbon surface active agent mixtures by NMR spectroscopy

Clapperton, R. M.; Ottewill, R. H.; Ingram, B. T.

doi:10.1021/la00013a007

Cited by 45 publications

(64 citation statements)

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“…As mentioned in our previous study ( 25 ) , the monolayer of these salts on pure The p-A, DV -A, and m ⊥ -A isotherms obtained for C 16 F 11 and C 18 F 11 salts at 298.2 K on pure water are shown water exhibits an expanded film only and has no breakpoint on the p -A curves. On the other hand, the in Fig.…”

Section: Resultssupporting

confidence: 65%

Monolayer Properties of Long-Chain Alkylammonium Perfluorohexanoates on the Concentrated Sodium Chloride Solution

Shibata

Moroi

Saito

et al. 1996

Journal of Colloid and Interface Science

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Section: Resultssupporting

confidence: 65%

Monolayer Properties of Long-Chain Alkylammonium Perfluorohexanoates on the Concentrated Sodium Chloride Solution

Shibata

Moroi

Saito

et al. 1996

Journal of Colloid and Interface Science

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“…A strong difference in solubilization power between spherical and rodlike micelles has previously been reported. 12,22,26,29,32,[40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58] The existence of completely demixed micelles remains questionable from the thermodynamical point of view. To study this possibility, the rheological properties of FS3 aqueous dilute solutions were investigated.…”

Section: Resultsmentioning

confidence: 99%

Novel Hydrocarbon and Fluorocarbon Polymerizable Surfactants: Synthesis, Characterization and Mixing Behavior

et al. 1998

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A series of novel polymerizable hydrocarbon and fluorocarbon cationic surfactants (N-alkoxycarboxymethyl-N-[2-(N ′-alkylacrylamido)ethyl]-N,N-dimethylammonium bromide) potentially useful for the formation of multicompartment polymeric micelles were prepared. Micellization and surface active properties of these surfactants and of their mixtures were determined by electrical conductivity and surface tension measurements. The interaction between the fluorocarbon and the hydrocarbon surfactants in the aqueous micellar state can be described by the regular solution theory with an interaction parameter ) 1.25 indicating the formation of one type of mixed micelles. The solubilization capacity of the pure and of the mixed surfactant systems for pyrene and for a new fluorocarbon azo dye were studied by UV absorption as a function of the surfactant concentration. It was found that the ability to solubilize these hydrophobic compounds depends strongly on the nature of the micellar core (hydrocarbon, fluorocarbon, or mixed), the polarity of the dye, the micellar shape, and the composition of the surfactant mixture. Langmuir 1998, 14, 4765-4775 S0743-7463(98)00245-5 CCC: $15.00

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“…The CMC of HFS is, indeed, higher than additivity would lead one to expect [35,53]. This could be explained (i) by the unfavorable enthalpy contribution of mixing fluorinated and hydrogenated groups in the core of the micelles (hydrogenated and fluorinated surfactants mix non‐ideally, to the point of forming separate micelles; see [16,54,55], and references therein), and/or (ii) by the polar character of F‐vicinal methylenes, which should work against transfer of the hydrophobic moiety from the aqueous solution to the core. It is interesting to note that, while both H‐TAC and F‐TAC form stable Newton black films, HF‐TAC does not [53], which may again betray the less favorable free enthalpy of transfer of the hemifluorinated moiety from water to a hydrophobic phase.…”

Section: Discussionmentioning

confidence: 99%

Hemifluorinated surfactants: a non‐dissociating environment for handling membrane proteins in aqueous solutions?

et al. 2004

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The instability of membrane proteins in detergent solution can generally be traced to the dissociating character of detergents and often correlates with delipidation. We examine here the possibility of substituting detergents, after membrane proteins have been solubilized, with non-detergent surfactants whose hydrophobic moiety contains a per£uorinated region that makes it lipophobic. In order to improve its a⁄nity for the protein surface, the £uorinated chain is terminated by an ethyl group. Test proteins included bacteriorhodopsin, the cytochrome b 6 f complex, and the transmembrane region of the bacterial outer membrane protein OmpA. All three proteins were puri¢ed using classical detergents and transferred into solutions of C 2 -H 5 C 6 F 12 C 2 H 4 -S-poly-Tris-(hydroxymethyl)aminomethane (HF-TAC). Transfer to HF-TAC maintained the native state of the proteins and prevented their precipitation. Provided the concentration of HF-TAC was high enough, HF-TAC/membrane protein complexes ran as single bands upon centrifugation in sucrose gradients. Bacteriorhodopsin and the cytochrome b 6 f complex, both of which are detergent-sensitive, exhibited increased biochemical stability upon extended storage in the presence of a high concentration of HF-TAC as compared to detergent micelles. The stabilization of cytochrome b 6 f is at least partly due to a better retention of protein-bound lipids. ß

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A study of fluorocarbon-hydrocarbon surface active agent mixtures by NMR spectroscopy

Cited by 45 publications

References 0 publications

Monolayer Properties of Long-Chain Alkylammonium Perfluorohexanoates on the Concentrated Sodium Chloride Solution

Monolayer Properties of Long-Chain Alkylammonium Perfluorohexanoates on the Concentrated Sodium Chloride Solution

Novel Hydrocarbon and Fluorocarbon Polymerizable Surfactants: Synthesis, Characterization and Mixing Behavior

Hemifluorinated surfactants: a non‐dissociating environment for handling membrane proteins in aqueous solutions?

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