The efficiency of solubilization in mixed micelles of nonionic and anionic surfactants

Muto, Yasushi; Asada, Masahiko; Takasawa, Akihiro; Esumi, Kunio; Meguro, Kenjiro

doi:10.1016/0021-9797(88)90200-7

Cited by 30 publications

(14 citation statements)

References 26 publications

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“…This means that dye molecules with polar substituents may be incorporated also in the outer region of nonionic surfactant micelles to a larger extent than for ionic surfactant micelles. Since the solubilization power is approximately the same regardless of the length of the polyoxyethylene chain (see Figure 7 ) it is likely that the dye accumulates in the innermost part of the outer region The possibility for the dye to be incorporated also in the hydrophilic shell is probably the reason why nonionic surfactants often have higher solubilization power than ionic surfactants [ 47 , 101 ].…”

Section: Location Of Solubilized Dye In the Micellementioning

confidence: 99%

“…It turns out, however, that in the majority of cases a mixture of an ionic surfactant and a nonionic surfactant does not give better solubilization of a hydrophobic dye than the use of one surfactant only [ 45 , 101 ]. An explanation to why addition of an ionic surfactant to a nonionic surfactant based system is not advantageous is that the character of the outer layer of the micelle is changed in an unfavorable way.…”

Section: Solubilization In Mixed Micellesmentioning

confidence: 99%

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Solubilization of Hydrophobic Dyes in Surfactant Solutions

2013

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In this paper, the use of surfactants for solubilization of hydrophobic organic dyes (mainly solvent and disperse dyes) has been reviewed. The effect of parameters such as the chemical structures of the surfactant and the dye, addition of salt and of polyelectrolytes, pH, and temperature on dye solubilization has been discussed. Surfactant self-assemble into micelles in aqueous solution and below the concentration where this occurs—the critical micelle concentration (CMC)—there is no solubilization. Above the CMC, the amount of solubilized dye increases linearly with the increase in surfactant concentration. It is demonstrated that different surfactants work best for different dyes. In general, nonionic surfactants have higher solubilization power than anionic and cationic surfactants. It is likely that the reason for the good performance of nonionic surfactants is that they allow dyes to be accommodated not only in the inner, hydrocarbon part of the micelle but also in the headgroup shell. It is demonstrated that the location of a dye in a surfactant micelle can be assessed from the absorption spectrum of the dye-containing micellar solution.

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Section: Location Of Solubilized Dye In the Micellementioning

confidence: 99%

Section: Solubilization In Mixed Micellesmentioning

confidence: 99%

Solubilization of Hydrophobic Dyes in Surfactant Solutions

2013

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“…Thermodynamic properties in a polymeric stationary phase may be determined by inverse gas chromatography. 4 In SFC, the phase equilibrium is considerably more complex due to two reasons: (1) the interactions in the dense fluid (mobile) phase are highly nonideal, and (2) the carrier fluid may swell the liquid (stationary) phase. In order to determine a thermodynamic property in the fluid-phase chromatographically, it is necessary to describe independently an analogous property in the liquid phase, and vice versa.…”

Section: Introductionmentioning

confidence: 99%

Phase equilibria, partial molar enthalpies, and partial molar volumes determined by supercritical fluid chromatography

Shim¹,

Johnston²

1991

J. Phys. Chem.

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A variety of types of thermodynamic properties have been determined at infinite dilution by supercritical fluid chromatography.A key challenge is to identify clearly the retention mechanism. An experimental technique is presented for the measurement of retention due to absorption into a bulk c 1 8 liquid (stationary) phase, independently of the adsorption on the support. The important effect of the swelling of the liquid phase by the fluid phase is included. Distribution coefficients are presented for naphthalene and phenanthrene between C02 and the C,* liquid phase, and used to determine Henry's constants in the liquid phase and solute partial molar volumes and enthalpies in the fluid phase. In the highly compressible region of C02 at 35 O C , solute partial molar enthalpies have been found to reach negative values of hundreds of kJ/mol, indicating strongly exothermic solute-solvent clustering.

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“…Complexation of a fluorocarbon surfactant with polymer can be .expected to be different from that of a hydrocarbon surfactant, because the fluorocarbon chain has hydrophobic and lipophobic properties (26)(27)(28)(29). Complexation of a fluorocarbon surfactant with polymer can be .expected to be different from that of a hydrocarbon surfactant, because the fluorocarbon chain has hydrophobic and lipophobic properties (26)(27)(28)(29).…”

mentioning

confidence: 99%

Association of nonionic polymer with hydrocarbon/fluorocarbon surfactant in aqueous solution

Nojima

Esumi

Meguro

1992

J Americ Oil Chem Soc

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The interaction between a nonionic polymer and a hydrocarbon or fluorocarbon surfactant has been investigated by means of surface tension, viscosity, electroconductivity, fluorescence probing, solubilization of a waterinsoluble dye, and electron spin resonance (ESR}. The systems studied consisted of polyvinylpyrrolidone (PVP) with lithium dodecyl sulfate (I,|DS) or lithium perfluoroo~ tane sulfonate (LiFOS). Surface tension measurements indicated that formation of PVP~surfactant complex is more favorable in the PVP-LiFOS system than in the PVP-LiDS system, and that the adsorbed amount of LiFOS is less than that of LIDS, although the CMCs of the surfactants are almost the same. In the PVP-LiFOS system, the relative viscosity and the solubilized amount of a water-insohible dye showed a maximum at a certain concentration of LiFOS in the region between two transitions observed in the surface tension, where also a change in the slope of the electroconductivity is observed. These results indicate that shielding of effective charge of the PVpoLiFOS complex causes a conformational change of PVP wrapped around the aggregate of LiFOS with an increase of free surfactant in the bulk phase. The conformational change can be correlated with microenviroumental properties of PVP-surfactant complexes. The microviscosity estimated with ESR indicated that the headgroups of LiFOS adsorbed on PVP are less tightly packed than those of LiFOS micelles, while an opposite result was obtained in the PVP-LiDS system. In particular, the marked high viscosity at a low concentration of LiFOS in the PVP-LiFOS system can probably be attributed to rigidity of the fluorocarbon chain of LiFOS.KEY WORDS: Lithium dodecyl sulfate, lithium perfluorooctane sulfonate, micvoenvironmental property, PVP-perfluorinated surfactant, solubilization of dye.

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The efficiency of solubilization in mixed micelles of nonionic and anionic surfactants

Cited by 30 publications

References 26 publications

Solubilization of Hydrophobic Dyes in Surfactant Solutions

Solubilization of Hydrophobic Dyes in Surfactant Solutions

Phase equilibria, partial molar enthalpies, and partial molar volumes determined by supercritical fluid chromatography

Association of nonionic polymer with hydrocarbon/fluorocarbon surfactant in aqueous solution

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