The Second CMC of the Aqueous Solution of Sodium Dodecyl Sulfate. III. Light-scattering

Kodama, Michiko; Kubota, Yukio; Miura, Masaji

doi:10.1246/bcsj.45.2953

Cited by 49 publications

(20 citation statements)

References 6 publications

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“…When the concentration of SDS is higher than its FCMC, the I max RRS -c curve has two inflexions, one in 25 mM and another in 69 mM, while the conductivity just follow a linear variation as a function of SDS concentration. The value of 69 mM conforms to the value of SCMC of 70 mM in previous literature determined by light scattering [20] and fluorescence probe method [21]. But for the concentration of 25 mM, we guess that the inflexion may attribute to the structural transition when some spherical micelles may aggregate to ellipsoidal, oblatoid or lamellar ones.…”

Section: Rrs Methods For the Determination Of Cpmc And Scmcsupporting

confidence: 87%

Determination of the critical premicelle concentration, first critical micelle concentration and second critical micelle concentration of surfactants by resonance Rayleigh scattering method without any probe

Shi

Luo

2011

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

121

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Section: Rrs Methods For the Determination Of Cpmc And Scmcsupporting

confidence: 87%

Determination of the critical premicelle concentration, first critical micelle concentration and second critical micelle concentration of surfactants by resonance Rayleigh scattering method without any probe

Shi

Luo

2011

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

121

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“…At this concentration, the alkyl chains start to aggregate, which is driven by hydrophobic attractive forces, and the SDS molecules began to form spherical micelles. Our FCMC value was consistent with the results obtained by light scattering [40] and ultraviolet-visible (UV-Vis) absorption measurements [17]. Previous studies have shown that the conformation of the SDS alkyl chains change to all trans conformation and become orderly under this condition [16,41].…”

Section: Self-assembly Process In Aqueous Sds Solutionsupporting

confidence: 91%

“…When the concentration of SDS was more than ∼69 mmol/L, the peak position of ν as (CH 2 ) showed a weak red shift. Previous studies have shown that this concentration (69 mmol/L) was the SCMC [19,22,40]. At the higher concentration, the SDS in solution gradually transformed from spherical micelles to rod-like micelles [4].…”

Section: Self-assembly Process In Aqueous Sds Solutionmentioning

confidence: 80%

Intermolecular Interactions in Self-Assembly Process of Sodium Dodecyl Sulfate by Vertically Polarized Raman Spectra

Wang

Lin

Chen

et al. 2017

Chinese Journal of Chemical Physics

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Molecular self-assembly is extremely important in many fields, but the characterization of their corresponding intermolecular interactions is still lacking. The C−H stretching Raman band can reflect the hydrophobic interactions during the self-assembly process of sodium dodecyl sulfate (SDS) in aqueous solutions. However, the Raman spectra in this region are seriously overlapped by the OH stretching band of water. In this work, vertically polarized Raman spectra were used to improve the detection sensitivity of spectra of C−H region for the first time. The spectral results showed that the first critical micelle concentration and the second critical micelle concentration of SDS in water were 8.5 and 69 mmol/L, respectively, which were consistent with the results given by surface tension measurements. Because of the high sensitivity of vertically polarized Raman spectra, the critical micelle concentration of SDS in a relatively high concentration of salt solution could be obtained in our experiment. The two critical concentrations of SDS in 100 mmol/L NaCl solution were recorded to be 1.8 and 16.5 mmol/L, respectively. Through comparing the spectra and surface tension of SDS in water and in NaCl solution, the self-assembly process in bulk phase and at interface were discussed. The interactions among salt ions, SDS and water molecules were also analyzed. These results demonstrated the vertically polarized Raman spectra could be employed to study the self-assembly process of SDS in water.

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“…Partition coefficients for several solutes which to our knowledge have not been previously studied are reported here. Furthermore, the work was done at very low concentration of the solutes, at concentrations of SDS below the second critical micelle concentration 70,71 (the concentration at which micelles change from spherical to rodlike structures), and with no added salt or organic modifiers in the SDS solution. This is in contrast to many of the other reported measurements which have been conducted with essentially saturated solutions of solute, [72][73][74][75] added salt and/or organic modifiers, 72,[75][76][77] or SDS concentrations above the second critical micelle concentration.…”

Section: Introductionmentioning

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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The Second CMC of the Aqueous Solution of Sodium Dodecyl Sulfate. III. Light-scattering

Cited by 49 publications

References 6 publications

Determination of the critical premicelle concentration, first critical micelle concentration and second critical micelle concentration of surfactants by resonance Rayleigh scattering method without any probe

Determination of the critical premicelle concentration, first critical micelle concentration and second critical micelle concentration of surfactants by resonance Rayleigh scattering method without any probe

Intermolecular Interactions in Self-Assembly Process of Sodium Dodecyl Sulfate by Vertically Polarized Raman Spectra

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

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