Evolution of the Diffusion Coefficient and Correlation Length of Aqueous Solutions of C12E6

Kole, T. M.; Richards, Claire; Fisch, Michael R.

doi:10.1021/j100069a029

Cited by 14 publications

(21 citation statements)

References 3 publications

(4 reference statements)

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“…Micellar structures are usually much larger than the solute; thus, the mobility of the solute is reduced compared to the mobility when micelles are absent. Diffusion behavior in aqueous micellar solutions has been studied by NMR spectroscopy (12)(13)(14)(15)(16)(17), light scattering (18,19), and concentration gradient methods such as the Taylor-Aris technique (20)(21)(22)(23), as well as by other experimental methods (24,25). NMR provides self-diffusion coefficients for the random thermal motion of labeled species in the systems of a uniform chemical composition (12), while light scattering has been used to measure the diffusion coefficients of micelles.…”

Section: Introductionmentioning

confidence: 99%

Diffusion Coefficients of Three Organic Solutes in Aqueous Sodium Dodecyl Sulfate Solutions

Yang

Matthews

2000

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Diffusion Coefficients of Three Organic Solutes in Aqueous Sodium Dodecyl Sulfate Solutions

Yang

Matthews

2000

Journal of Colloid and Interface Science

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“…The study of the properties of micelles in aqueous solutions has a rich history. In recent years there has been a great deal of experimental and theoretical interest in studying the growth of micelles under appropriate solution conditions from approximately spherical minimum micelles to rodlike spherocylinders. − One of the more common probes of this behavior has been static and dynamic light scattering. − ,,,− These experiments have been interpreted to indicate that the resulting micelles are flexible objects ,,− and that at very modest concentrations, of order a few weight percent, these micelles may entangle and form a semidilute solution. ,, This micellar growth has been observed and explained in a wide variety of surfactant types including ionic, − ,,, nonionic, ,,, and zwitterionic surfactants. ,− …”

Section: Introductionmentioning

confidence: 99%

Solution Behavior of the Zwitterionic Surfactant Octadecyldimethylbetaine

1998

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A light scattering, viscosity, surface tension, and cryo-TEM study was performed on aqueous solutions of octadecyldimethylbetaine (C18DMB). The dilute to semidilute crossover concentration was found to be approximately 0.35% concentration by weight from both light scattering and viscosity data. The results from the dynamic light scattering data were significantly better described by a model with two decay times, rather than a single decay, cumulants model. The dynamic light scattering data were also fit to a Kohlrausch−Williams−Watts form, which is consistent with translational diffusion and internal modes. The light scattering, viscosity, and cryo-TEM data are all consistent with the existence of long rodlike micelles. The critical micellar concentration, cmc, was determined via surface tension measurements and found to be 5 × 10-6 M at 40 °C.

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“…They have been, thus, rather widely studied to characterize their shape and size by employing the theoretical concepts and experimental methods developped in the polymer solution studies, such as static (SLS) and dynamic light scattering (DLS), [3][4][5][6][7][8][9][10][11][12] small-angle neutron scattering (SANS), [13][14][15] viscometry, 15,16 pulsed-field gradient NMR, [4][5][6][7] and so forth. However, solutions of polymer-like micelles are essentially different from those of real polymers.…”

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confidence: 99%

Wormlike Micelles of Polyoxyethylene Alkyl Ethers CiEj

Einaga¹

2009

Polym. J.

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It is demonstrated that wormlike micelles of nonionic surfactants polyoxyethylene alkyl ethers H(CH 2 ) i (OCH 2 CH 2 ) j OH (C i E j ) have been successfully characterized by static (SLS) and dynamic light scattering (DLS) measurements and viscometry with the aid of the theories developed so far in the field of polymer solution studies, i.e., a molecular thermodynamic theory for light scattering, chain statistical and hydrodynamic theories for semi-flexible polymers. The results for the excess Rayleigh ratio, radius of gyration, hydrodynamic radius, and intrinsic viscosity have been shown to be well represented by the theories based on a wormlike spherocylinder model. Some salient features found for the micelles of C i E j with various i or j, their binary mixtures, and the micelles including n-alcohol and n-alkane are discussed. The nonionic surfactant polyoxyethylene mono-alkyl ether H(CH 2 ) i (OCH 2 CH 2 ) j OH, (abbreviated C i E j ), exhibits a wide variety of phases in aqueous solution as a function of surfactant concentration and temperature. 1,2 Here, i and j denote the number of methylene groups in the alkyl group and that of repeating units in the oxyethylene group, respectively. At dilute regime, the C i E j + water binary system forms an isotropic phase, that is so-called L 1 phase, which consists of micelles formed with the amphiphilic molecules and water. The system exhibits the LCST behavior; the micellar solutions are phaseseparated into two phases at high temperatures. It is now well established that the micelles grow in size with increasing concentration and raising temperature, in particular to a greater extent when approaching the phase boundary, assuming threadlike or wormlike cylindrical shape. (See Figure 1.) The wormlike micelles have been visually shown by the cryo-TEM observation, 3 in which in the process of micellar growth, threadlike or polymer-like micelles are evolved in the solutions examined. The micelles are, thus, sometimes called ''living'' or ''equilibrium'' polymers in a sense that the linear macromolecules formed can break and recombine.The polymerlike micelles have certain similarities to real polymers and then their solution properties are analogous to those of real polymer solutions. They have been, thus, rather widely studied to characterize their shape and size by employing the theoretical concepts and experimental methods developped in the polymer solution studies, such as static (SLS) and dynamic light scattering (DLS), [3][4][5][6][7][8][9][10][11][12] small-angle neutron scattering (SANS), 13-15 viscometry, 15,16 pulsed-field gradient NMR, 4-7 and so forth. However, solutions of polymer-like micelles are essentially different from those of real polymers. The molar mass of the micelle, i.e., the aggregation number, varies with surfactant concentration, temperature, and other solvent conditions. The average value and distribution of the micellar size are determined by multiple chemical equilibrium among micelles with various aggregation numbers. Although the equi...

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Evolution of the Diffusion Coefficient and Correlation Length of Aqueous Solutions of C12E6

Cited by 14 publications

References 3 publications

Diffusion Coefficients of Three Organic Solutes in Aqueous Sodium Dodecyl Sulfate Solutions

Diffusion Coefficients of Three Organic Solutes in Aqueous Sodium Dodecyl Sulfate Solutions

Solution Behavior of the Zwitterionic Surfactant Octadecyldimethylbetaine

Wormlike Micelles of Polyoxyethylene Alkyl Ethers CiEj

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