Solubilization of mono-and dichlorophenols by hexadecylpyridinium chloride micelles. Effects of substituent groups

Lee, Byung Hwan; Christian, Sherril D.; Tucker, Edwin E.

doi:10.1021/la00091a037

Cited by 46 publications

(49 citation statements)

References 5 publications

(7 reference statements)

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“…With increasing analyte concentration, analyte is preferentially solubilized by analyterich micelles, instead of analyte-free ones. However, analyte does not condense in or on micelles at mobilephase concentrations equal to b 21 , as do gases on adsorbents. In condensed media, Eq.…”

Section: Isothermmentioning

confidence: 99%

“…Micellar isotherms have been determined by several methods, including GC [3,[11][12][13], vapor pressure [2,14,15], gel filtration [16], ultrafiltration [17,18], fluorescence [19], and semiequilibrium dialysis [20,21]. They can be expressed in several forms, one of which is the coordinate pair (Rc, (1 2 R)c/([S] 2 CMC)), where [S] is the surfactant concentration and CMC is the critical micelle concentration.…”

Section: Isothermmentioning

confidence: 99%

“…As reported below, retardation factor R varies only slightly in our study, such Based on R ? s reported in Table 2 21 . Consequently, our study was carried out at concentrations well below the asymptotic behavior predicted by b.…”

Section: The Coefficients Kmentioning

confidence: 99%

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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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Section: Isothermmentioning

confidence: 99%

Section: Isothermmentioning

confidence: 99%

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

Williamson¹,

Davis²

2005

Electrophoresis

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“…19 For small amphipathic molecules, micelles form only above a critical concentration, termed the critical micelle concentration (CMC). In some cases, the foulant is considered a guest within the micelle, whereas in others it participates in forming mixed micelles.…”

Section: Resultsmentioning

confidence: 99%

“…4 [12][13][14][15][16][17][18] K ϭ X c 0 (4) where X represents the mole fraction of the organic solute in the polymer domain and c 0 represents the concentration of free foulant present in a nonassociated state. 19 The two equilibrium constants k and K are easily determined from the experimental data and are related by eq. 5.…”

Section: Resultsmentioning

confidence: 99%

Amphipathic polymers with stimuli-responsive microdomains for water remediation: Binding studies withp-cresol

Richardson

Armentrout

McCormick

1999

J. Appl. Polym. Sci.

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Amphipathic, stimuli-responsive water-soluble polymers have been investigated as potential remediation agents for micellar enhanced ultrafiltration (MEUF). The systems represent divergent architectural types, a triblock ABA copolymer of PEO-PPO-PEO, an n-octylamide modified poly(sodium maleate-alt-ethyl vinyl ether), and the transport protein, bovine serum albumin. Each type exhibits stimuli-dependent microphase separation or domain formation in response to temperature, pH, and/or ionic strength changes. Segmental associations result in hydrophobic clusters resembling those present in small molecule surfactant micelles. The effects of such segmental aggregation on sequestration of a model hydrophobic foulant, p-cresol, have been investigated using equilibrium dialysis. The favorable molar binding values, the large hydrodynamic dimensions of the stable polymer aggregates, and potential reversibility of foulant loading could have commercial utility in high flow rate, multiple-pass remediation processes.

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Solubilization of trichloroethylene by polyelectrolyte/surfactant complexes

1994

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Solubilization of mono-and dichlorophenols by hexadecylpyridinium chloride micelles. Effects of substituent groups

Cited by 46 publications

References 5 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

Amphipathic polymers with stimuli-responsive microdomains for water remediation: Binding studies withp-cresol

Solubilization of trichloroethylene by polyelectrolyte/surfactant complexes

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