Solubilization of hydrocarbons by surfactant micelles and effect of added salt

Mahmoud, Faten Z.; Higazy, Wafaa S.; Christian, Sherril D.; Tucker, Edwin E.; Taha, A.

doi:10.1016/0021-9797(89)90149-5

Cited by 22 publications

(14 citation statements)

References 19 publications

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“…As a result, the nontrapped metals in solution pass through the membrane leading to lower rejection. 27 However, it is observed that the rejection factor enhances in the presence of NaCl in this study. This feature is attributed to the decrease of CAC in the presence of salt.…”

Section: Binding Of Organic Compounds and Metal Ionscontrasting

confidence: 45%

Synthesis and association properties in water solution of random copolymers of 2‐acrylamido‐2‐methyl‐1‐propane sulfonic acid and isodecyl methacrylate—potential application as surfactants in micellar‐enhanced ultrafiltration processes

Peinado

Catalina

Miguel

2007

J of Applied Polymer Sci

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: Synthesis and association properties in water solution of random copolymers of 2-acrylamido-2-methyl-1-propane sulfonic acid and isodecyl methacrylate-potential application as surfactants in micellar-enhanced ultrafiltration processes. Fluorescence spectroscopy was used to further confirm the copolymers self-aggregate in water. Critical concentration of the self-aggregate formation (CAC) decreased by increasing the molar fraction of iDMA in the AMPS co copolymers and varied between 1.20 and 0.04 g/L depending on the degree of hydrophobic modification. Hence, copolymer composition and charge density allowed tuning the pseudomicellar characteristics of these new amphiphilic copolymers. The addition of a salt or a low-molecular-weight surfactant was studied. Binding of CTAB to the AMPS co copolymers leads to a high decrease of CAC, i.e., 0.006 g/L. Effect of the composition in the viscosimetric behavior of the hydrophobically modified copolymers AMPS co was investigated. The removal of single metal ions, Cu 21 , and m-cresol from aqueous solutions by ultrafiltration with the help of the copolymers was investigated. Equilibrium dialysis experiments demonstrate that the formation of hydrophobic microdomains can be used to control the sequestration of foulants, and thus these novel copolymers have potential application as polymeric surfactants in micellar-enhanced ultrafiltration processes for water purification. Journal of Applied Polymer

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Section: Binding Of Organic Compounds and Metal Ionscontrasting

confidence: 45%

Synthesis and association properties in water solution of random copolymers of 2‐acrylamido‐2‐methyl‐1‐propane sulfonic acid and isodecyl methacrylate—potential application as surfactants in micellar‐enhanced ultrafiltration processes

Peinado

Catalina

Miguel

2007

J of Applied Polymer Sci

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“…The free-energy difference between g im and g s is constant, however, and one conveys the same information as the other. The addition of electrolyte can stabilize solutes in micelles, as evidenced on addition of NaCl by reduction of g im for benzene in sodium dodecanoate and CTAB [38], for hexane in CTAB [38], sodium dodecanoate [38], and SDS [35], and for cyclohexane in CTAB [38]. However, stabilization does not always occur.…”

Section: Origin Of Variation Of R With Nbz and Buffer Concentrationsmentioning

confidence: 96%

“…Studies have reported decreases of the intramicellar activity coefficient g im with increasing solute mole fraction for n-hexanol [37], 2-hexyne [37], 2-hexene [37], n-hexane [35,37], cyclohexane [35], benzene [24], toluene [24], ethyl benzene [24], and n-butyl benzene [24] in SDS (the g im of n-hexanol eventually increases at modest mole fraction); benzene in SOS [19,36]; n-pentane in Brij 35 [37]; benzene in sodium dodecanoate [38]; cyclohexane in CTAB [38], sodium dodecanoate [38], n-hexadecylpyridinium chloride (CPC) [35], and nonylphenoxy-polyethyleneoxide-ethanols [35]; and n-hexane in sodium dodecanoate [38], CTAB [38], and CPC [35,44]. The trend also is common for mixed micellar systems [35].…”

Section: Origin Of Diffuse Fronts and Sharp Rears Of Peaks In Mekcmentioning

confidence: 96%

“…(8b), g s also must be described. The intramicellar activity coefficient g im of several solutes in different surfactants, in the presence and absence of NaCl, has been measured by vapor-pressure methods [19,23,[35][36][37][38] and headspace GC [24]. g im is a rational activity coefficient, differing from the practical activity coefficient g s by the choice of standard state, which is the pure solute (i.e.…”

Section: Origin Of Variation Of R With Nbz and Buffer Concentrationsmentioning

confidence: 99%

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Origin of peak asymmetry and isotherm nonlinearity in micellar electrokinetic chromatography: Variation of peak shape with buffer concentration

Williamson¹,

Davis²

2006

Electrophoresis

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The diffuse fronts and sharp rears of peaks of nitrobenzene (nbz) solubilized at high concentrations in 50 mM SDS and 2.5, 25, and 50 mM sodium tetraborate buffers were modeled in MEKC by measurements of, and fits to, concave upward isotherms, and by numerical solution of the continuity equation. The isotherms varied with buffer concentration, with the smallest limiting slope and largest curvature found for the 50 mM tetraborate buffer. The Brunauer, Emmett, and Teller isotherm described the peak profiles in all buffers, with symmetrical peaks observed at sub- and low-mM levels of nbz, anti-Langmuirian peaks observed at 10-20 mM levels, and aquiline peaks resembling curved noses observed at 20-30 mM levels. The variation of the partition coefficient with nbz and buffer concentrations was shown to result from nonideal thermodynamics. High-buffer concentrations salt out nbz from the mobile phase, as quantified by a mobile-phase activity coefficient related to the Setchenov constant of nbz in sodium tetraborate. The activity coefficient of nbz in SDS micelles was shown to resemble that measured by other researchers for benzene in micelles of sodium octyl sulfate, i.e. it decreases with increasing solute concentration and increases with electrolyte concentration. Many examples from the literature are discussed, in which the variation of the intramicellar activity coefficient with solute mole fraction is consistent with peaks having diffuse fronts and sharp rears.

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“…Of particular interest is the investigation of the effect of different additions on the lyotropic mesomorphism, temperature and concentration regions of lyotropic phases [7][8][9][10][11]. The study of the effect of additional components introduced into the lyotropic system on mesomorphous, morphological and thermodynamic properties of lyotropic systems are also of special interest.…”

Section: Introductionmentioning

confidence: 99%

Phase States in Potassium Oleate+Water and Potassium Oleate+Water+Decanol Lyotropic Systems

1998

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In this work the investigations of the characteristic textures and the dynamics of their concentration and temperature transformations iii potassium oleate+water lyotropic system have been carried out. The effect of the decanol ohs lyotropic mesomoryhism as well as on the character of typical textures and the concentration ranges of lyotropic liquid crystalline mesophases have also been studied. The phase states diagrams of the potassium oleate+water and potassium oleate+ decanol-} water lyotropic liquid crystalline systems are presented.

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Solubilization of hydrocarbons by surfactant micelles and effect of added salt

Cited by 22 publications

References 19 publications

Synthesis and association properties in water solution of random copolymers of 2‐acrylamido‐2‐methyl‐1‐propane sulfonic acid and isodecyl methacrylate—potential application as surfactants in micellar‐enhanced ultrafiltration processes

Synthesis and association properties in water solution of random copolymers of 2‐acrylamido‐2‐methyl‐1‐propane sulfonic acid and isodecyl methacrylate—potential application as surfactants in micellar‐enhanced ultrafiltration processes

Origin of peak asymmetry and isotherm nonlinearity in micellar electrokinetic chromatography: Variation of peak shape with buffer concentration

Phase States in Potassium Oleate+Water and Potassium Oleate+Water+Decanol Lyotropic Systems

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