Solubilization of benzene in aqueous sodium dodecyl sulfate solutions measured by differential spectroscopy

Rehfeld, Selwyn J.

doi:10.1021/j100696a021

Cited by 67 publications

(43 citation statements)

References 3 publications

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“…agree well with previous determinations [2][3][4][5][6][36][37][38][39][40][41][42][43][44][45][46][47], although the different unit conventions must be considered. The inset to Fig.…”

Section: The Coefficients Ksupporting

confidence: 91%

Modeling of anti-Langmuirian peaks in micellar electrokinetic chromatography: Benzene and naphthalene

Williamson¹,

Davis²

2005

Electrophoresis

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Peaks of benzene (bz) and naphthalene (np) having diffuse fronts and steep rears under overload conditions were studied quantitatively in MEKC with SDS surfactant. The retardation factors of these compounds, solubilized at microM to mM concentrations by either 10, 30, or 50 mM SDS, were determined by vacancy MEKC and frontal analysis MEKC. Isotherm coordinates were calculated from the retardation factors, and the equation for the concave upward anti-Langmuir isotherm was fit to them. Peak profiles were computed with the MacCormack algorithm from the isotherm fits and a simplified continuity equation appropriate to MEKC. These profiles were compared to ones generated in normal MEKC from samples of bz and np solubilized at muM to mM concentrations by either 10, 30, or 50 mM SDS. In all cases, the anti-Langmuir isotherm described the asymmetry of experimental peaks. For bz in 30 and 50 mM SDS and np in 10 and 50 mM SDS, good to excellent agreement was found between the experimental and predicted profiles. For bz in 10 mM SDS, the experimental profiles were more broadened than the predicted ones, although their asymmetries agreed. For np in 30 mM SDS, the experimental isotherm predicted greater peak asymmetry than was observed, and the correct anti-Langmuir isotherm for all sample concentrations and field strengths was calculated from the most asymmetrical peak by the inverse method. The relative decrease of zone velocity with increasing analyte concentration was calculated from the isotherm parameters, electrokinetic mobilities, retardation factors, surfactant concentrations, and CMC. The simplification of the continuity equation was justified.

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“…agree well with previous determinations [2][3][4][5][6][36][37][38][39][40][41][42][43][44][45][46][47], although the different unit conventions must be considered. The inset to Fig.…”

Section: The Coefficients Ksupporting

confidence: 91%

Modeling of anti-Langmuirian peaks in micellar electrokinetic chromatography: Benzene and naphthalene

Williamson¹,

Davis²

2005

Electrophoresis

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“…In fact, some studies have concluded that benzene is indeed solubilized in the micellar core. 74,[143][144][145][146][147] This does not, however, seem to be the case for dilute solute solutions. For example, for both benzene and toluene acting as solutes, the data in Figure 11 suggest that bulk methanol is a better model of SDS micelles than are the other bulk solvents listed.…”

Section: Resultsmentioning

confidence: 99%

Study of Water−Sodium Dodecyl Sulfate Micellar Solubilization Thermodynamics for Several Solute Homolog Series by Headspace Gas Chromatography

1996

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We employed headspace gas chromatography to measure water-to-sodium dodecyl sulfate (SDS) micellar partition coefficients for homologous series of n-alkylbenzenes, 1-nitroalkanes, 1-alkanols, and 2-ketones. The free energy of transfer per methylene unit is -612 cal/mol for polar solutes and -534 cal/mol for nonpolar solutes. Henry's law was also explored for the n-alkylbenzenes and 2-ketones and found to hold to total solute mole fractions of at least 7 × 10 -3 and 3.4 × 10 -2 in the SDS micellar phase, respectively. Additionally, we compared water-to-SDS partition coefficients to water-to-bulk organic solvent partition coefficients for methylene units and whole solutes. From these comparisons we conclude that short, polar organic solvents such as methanol and nitromethane make the best models of the solutes' micellar environment and that the solutes and their methylene units are located in the relatively polar palisade and/or Stern layers of the SDS micelles.

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“…[3] and [4], then should hold for micellar SOS solutions. The amplitude then should be inversely proportional to fc where p, u , cmc, and AVO are relatively constant.…”

Section: Discussionmentioning

confidence: 99%

Solubilization sites in micellar sodium octylsulphate solutions by ultrasonic spectroscopy

Jobe¹,

Reinsborough²,

White³

1982

Can. J. Chem.

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. Can. J. Chem. 60, 279 (1982). Relaxation frequencies ,f, and amplitudes A were measured ultrasonically over the 3.5-52.5 MHz range at 25°C for the fast exchange of monomer between micelles and bulk solution in micellar sodium octylsulfate solutions with solubilizates present in small amounts. The additives were cyclohexane, pyridine-2-azo-p-dimethylaniline (PADA), benzene. toluene, andp-xylene. Only cyclohexane produced no changes in f, or A . The variations in the relaxationai parameters suggested that cyclohexane was situated within the micellar core and PADA, primarily in the surface region of the micelle. Benzene and toluene were adsorbed in minute quantities into the micelle surface but, with additive concentrations beyond a few molecules per micelle, were found principally in the micellar core. Toluene, along with p-xylene, showed an initial dip in fc that may indicate that the first few molecules of these additives were incorporated into the palisade layer of the rnicelle. Chem. 60, 279 (1982). On a mesure par ultrason a des frequences allant de 3,5 a 52,5 MHz et a 25'C les frequences de relaxation fc et les amplitudes A de I'echange rapide de monomere entre les micelles et la solution dans des solutions miceliaires d'octylsulfate de sodium ayant des petites quantites de solubilisants. On a utilise comme additifs: le cyclohexane, la pyridine-azo-2 dimethylaniline (PADA), le benzene, le toluene et lep-xylene. Le cyclohexane est le seul a ne pas influencer les frequences de relaxation et les amplitudes. Les variations des parametres de relaxation suggerent que le cyclohexane est situe dans la masse micellaire alors que la PADA se trouve de f a~o n primaire dans la region de la surface de la micelle. Le benzene et le toluene sont adsorbes en petites quantites dans la surface de la micelle mais, a des concentrations croissantes de I'ordre de quelques molecules par micelle, on les a trouve principalement dans le noyau micellaire. Le toluene ainsi que le xylene revelent une diminution initiale de f, qui indique que les quelques premieres molecules de ces additifs sont incorporees dans la couche protectrice de la micelle.[Traduit par le journal]

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Solubilization of benzene in aqueous sodium dodecyl sulfate solutions measured by differential spectroscopy

Cited by 67 publications

References 3 publications

Modeling of anti-Langmuirian peaks in micellar electrokinetic chromatography: Benzene and naphthalene

Modeling of anti-Langmuirian peaks in micellar electrokinetic chromatography: Benzene and naphthalene

Study of Water−Sodium Dodecyl Sulfate Micellar Solubilization Thermodynamics for Several Solute Homolog Series by Headspace Gas Chromatography

Solubilization sites in micellar sodium octylsulphate solutions by ultrasonic spectroscopy

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