Self-Diffusion of Ionic Surfactants and Counterions in Premicellar and Micellar Solutions of Sodium, Lithium and Cesium Dodecyl Sulfates as Studied by NMR-Diffusometry

Гнездилов, О. И.; Zuev, Yu. F.; Зуева, О. С.; Potarikina, K. S.; Us’yarov, O. G.

doi:10.1007/s00723-010-0185-1

Cited by 27 publications

(21 citation statements)

References 28 publications

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“…As displayed in Table 3 for some alkali nuclei, we obtain some correlation between the orders of magnitude of their relaxation rate measured in dilute aqueous solution 52 and the intrinsic parameter extracted from the quadrupolar coupling constant ([Q(1 − γ ∞ )] 2 /[2I(2I − 1)] 2 ). As illustrated in Table 3, the quadrupolar relaxation mechanism appears very efficient for monitoring the NMR relaxation of some alkali cations ( 85 Rb, 39 K, and 23 Na) in dilute aqueous solutions. By contrast, in the presence of paramagnetic impurities, the heteronuclear dipolar coupling may significantly contribute to the NMR relaxation of other quadrupolar nuclei ( 7 Li and 133 Cs) because of the weakness of their quadrupolar contribution.…”

Section: A2 Relaxation Contributionsmentioning

confidence: 99%

¹³³Cs Nuclear Magnetic Resonance Relaxometry as a Probe of the Mobility of Cesium Cations Confined within Dense Clay Sediments

et al. 2015

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133 Cs nuclear magnetic resonance is used to quantify the mobility of cesium counterions confined within the interlamellar space of synthetic Hectorite clay under controlled hydration conditions. The degree of lamellae ordering within the macroscopic clay sediment is determined by analyzing the variation of the 133 Cs NMR spectra as a function of the sample orientation in the static magnetic field. Furthermore, a detailed analysis of the 133 Cs NMR spectra allows one to determine the order of magnitude of the quadrupolar and heteronuclear dipolar couplings monitoring the NMR relaxation of the cesium cations confined within clay sediments. Finally, a lower limit to the average residence time of the cesium cations within the clay interlamellar space is determined by using 133 Cs NMR relaxation measurements under spinlocking conditions.

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Section: A2 Relaxation Contributionsmentioning

confidence: 99%

¹³³Cs Nuclear Magnetic Resonance Relaxometry as a Probe of the Mobility of Cesium Cations Confined within Dense Clay Sediments

et al. 2015

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“…Analogous regularities are also typical of the chemical shifts of protons in β CH 2 and γ CH 2 groups. [20] under the following conditions: CMC 1 = 8 mM; the degree of counterion binding by micelles, β = 0.82 [21]; and n 1 = 60 [22][23][24]. The calculation was carried out by the equation (11) taking into account that [25] Here n = n 1 (1 + β), is the micellization constant, and c 0 is the critical micellization concentration.…”

Section: Determination Of Chemical Shiftsmentioning

confidence: 99%

Association of sodium dodecyl sulfate in aqueous solutions according to chemical shifts in 1H NMR spectra

et al. 2013

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Proton chemical shifts of different atomic groups in sodium dodecyl sulfate (SDS) have been stud ied by 1 H NMR spectroscopy as functions of surfactant concentration in aqueous solutions. Three surfactant concentration ranges of the chemical shifts have been revealed. The first range corresponds to the premicellar solutions, the second one is in the vicinity of critical micelle concentration (CMC 1 ), and the third range cor responds to high surfactant concentrations, at which intermicellar interactions play a significant role. The parameters of SDS association (CMC 1 and CMC 2 ) determined based on the concentration dependences of the chemical shifts are in satisfactory agreement with the data available from the literature. The concept of critical dimerization concentration (CDC) has been introduced for the first concentration range. The values of CDC and dimerization constant K 2 (210 × 60 dm 3 /mol) have been estimated within the framework of the two state model.

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“…Viscosity measurements were made on select solutions to confirm that the changes observed in the micelle diffusion coefficients resulted from changes in their hydrodynamic radii and not from increasing solution viscosity. NMR diffusion measurements were also used to investigate the effect of solution pH on the binding of cationic amino acids to the negatively charged und-Leu micelle surface [29][30][31][32][33][34]. The counterions investigated in this study were sodium (Na ? )…”

Section: Introductionmentioning

confidence: 99%

Effect of pH on the Binding of Sodium, Lysine, and Arginine Counterions to l‐Undecyl Leucinate Micelles

Lewis

Hughes

Vasquez

et al. 2016

J Surfact & Detergents

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Micelle formation by the amino acid‐based surfactant undecylenyl l‐leucine was investigated as a function of solution pH with NMR, dynamic light scattering, and fluorescence spectroscopy. NMR and dynamic light scattering showed that 50 mM undecylenyl l‐leucine and 50 mM NaHCO3 solutions contained micelles approximately 20 Å in diameter and that micelle radius and the mole fraction of surfactant molecules associated with micelles changed very little with solution pH. The binding of the amino acids arginine and lysine to the anionic micelles was also investigated from pH 7.0 to 11.5. Below pH 9.0, the mole fraction of arginine cations bound to the micelles was approximately 0.4. Above pH 9.0, the arginine counterions became zwitterionic, and the mole fraction of bound arginine molecules decreased steadily to less than 0.1 at pH 11. When arginine dissociated from the micelles, their radii decreased from 14 to 10 Å. Similar behavior was observed with lysine; however, when lysine dissociated from the micelle surface, little change in micelle radius was observed. Two‐dimensional NMR experiments suggested that below pH 9.0, l‐arginine bound perpendicular to the micelle surface primarily though its side chain amine while l‐lysine bound parallel to the surface through both of its amine functional groups. Finally, the rate at which the amide protons on the surfactant headgoup exchanged with solvent was investigated with NMR spectroscopy. The exchange reaction was faster in solutions containing only surfactant monomers and slower when the surfactants were in micellar form and the headgoup amide protons were less exposed to solvent.

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Self-Diffusion of Ionic Surfactants and Counterions in Premicellar and Micellar Solutions of Sodium, Lithium and Cesium Dodecyl Sulfates as Studied by NMR-Diffusometry

Cited by 27 publications

References 28 publications

¹³³Cs Nuclear Magnetic Resonance Relaxometry as a Probe of the Mobility of Cesium Cations Confined within Dense Clay Sediments

¹³³Cs Nuclear Magnetic Resonance Relaxometry as a Probe of the Mobility of Cesium Cations Confined within Dense Clay Sediments

Association of sodium dodecyl sulfate in aqueous solutions according to chemical shifts in 1H NMR spectra

Effect of pH on the Binding of Sodium, Lysine, and Arginine Counterions to l‐Undecyl Leucinate Micelles

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Self-Diffusion of Ionic Surfactants and Counterions in Premicellar and Micellar Solutions of Sodium, Lithium and Cesium Dodecyl Sulfates as Studied by NMR-Diffusometry

Cited by 27 publications

References 28 publications

133Cs Nuclear Magnetic Resonance Relaxometry as a Probe of the Mobility of Cesium Cations Confined within Dense Clay Sediments

133Cs Nuclear Magnetic Resonance Relaxometry as a Probe of the Mobility of Cesium Cations Confined within Dense Clay Sediments

Association of sodium dodecyl sulfate in aqueous solutions according to chemical shifts in 1H NMR spectra

Effect of pH on the Binding of Sodium, Lysine, and Arginine Counterions to l‐Undecyl Leucinate Micelles

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Product

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¹³³Cs Nuclear Magnetic Resonance Relaxometry as a Probe of the Mobility of Cesium Cations Confined within Dense Clay Sediments

¹³³Cs Nuclear Magnetic Resonance Relaxometry as a Probe of the Mobility of Cesium Cations Confined within Dense Clay Sediments