Application of the dynamical droplet model to critical nonionic amphiphile-water micellar solutions

Ducros, E.; Haouache, S.; Rouch, J.; Hamano, K.; Fukuhara, Koichi; Tartaglia, P.

doi:10.1103/physreve.50.1291

Cited by 13 publications

(8 citation statements)

References 36 publications

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“…[51][52][53] These characteristics have been suggested to reflect effects from the nonvanishing size of the fluctuating micelles and have been discussed in terms of the dynamic droplet model. Dynamic light scattering measurements of mixtures of water with C 6 E 3 and C 10 E 4 54 as well as C 12 E 5 55 are in conformity with this model. However, there does not exist a theory describing the ultrasonic properties of a liquid mixture in terms of the droplet model.…”

Section: Discussionsupporting

confidence: 78%

Monomer Exchange and Concentration Fluctuations in Poly(ethylene glycol) Monoalkyl Ether/Water Mixtures. Dependence upon Nonionic Surfactant Composition

Telgmann

Kaatze

2000

J. Phys. Chem. A

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The ultrasonic absorption spectra between 105 Hz and 2 × 109 Hz, the sound velocities at different frequencies, and the shear viscosities of aqueous solutions of the following nonionic surfactants have been measured: C6E4, C6E5, C7E3, C8E4, C8E5, C10E4, and C12E5. Most C i E j /water systems have been considered at different temperatures between 12 and 40 °C and/or at different concentrations (0.01 mol/L ≤ c < 0.33 mol/L). The results are compared to those for the triethylene glycol monohexyl ether/water (C6E3/H2O) system reported previously. At solute concentrations around the critical micelle concentration the ultrasonic spectra show one relaxation term due to the formation/decay kinetics of oligomeric species. At higher surfactant content much more complicated spectra reveal the simultaneous presence of various processes. All systems are subject to local fluctuations in the micelle concentration which are described by the Bhattacharjee−Ferrell model here. The spectra for the shorter surfactants C6E4, C6E5, C7E3, and C8E5, as those for C6E3, in addition to the Bhattacharjee−Ferrell contribution exhibit a lower frequency Hill-type relaxation term which is attributed to the monomer exchange process. With the C8E4/water and the C10E4/water systems the monomer exchange equilibrium is reflected by two or one relaxation terms with discrete relaxation time, respectively. In the C12E5/water mixture, as a result of the small monomer concentration, contributions from the exchange process are missing in the spectra. The long chain micelle solutions (C8E5, C10E4, C12E5) also show contributions from an ultrahigh-frequency relaxation with relaxation time at around 0.25 ns. It is attributed to the chain rotational isomerization. The parameters of the different molecular mechanisms are discussed, particularly in view of the simultaneous action of the monomer exchange and the fluctuations in the micelle concentration. Also evaluated is the background contribution to the ultrasonic spectra, yielding a shear viscosity relaxation in the megahertz frequency range.

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Section: Discussionsupporting

confidence: 78%

Monomer Exchange and Concentration Fluctuations in Poly(ethylene glycol) Monoalkyl Ether/Water Mixtures. Dependence upon Nonionic Surfactant Composition

Telgmann

Kaatze

2000

J. Phys. Chem. A

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“…The contrasts with the value of the amplitude 0,s = 0.38 nm reported by Kostko, Anisimov, and Sengers 17 for the S5 sample. 24,25 Only in very few cases two dynamic contributions have been detected in liquid-liquid critical points. Hence it probably indicates that the system has an internal length that, far enough from T c , competes with .…”

Section: Discussionmentioning

confidence: 99%

Collective and self-diffusion coefficients in an ionic critical mixture: 3-methylpyridine+water+NaBr

Hernández

Monroy

Ortega

et al. 2005

The Journal of Chemical Physics

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The dynamics of concentration fluctuations of three critical samples of the 3-methylpyridine (3MP)+water+NaBr system have been measured by photon correlation spectroscopy. The collective-diffusion coefficient D shows the usual Ising behavior near the critical temperature T(c). However, as |T-T(c)| increases, the dynamic correlation length calculated from D, xi, takes values higher than the correlation length of the critical fluctuations calculated from static light scattering, xi(s). At the largest |T-T(c)| measured, xi approaches the value, xi(0,d) approximately equal to 1.13 nm, while the amplitude of xi(s) is xi(0,s)=0.38 nm. Pulsed-gradient NMR spectroscopy points out the existence of two dynamic contributions. One of them is consistent with the existence of molecular entities of hydrodynamic radius 0.31 nm, while the other one indicates the existence of aggregates rich in 3MP of radius 1.16 nm. The existence of the aggregates may explain the apparent anomalous behavior of the dynamic light scattering experiments for this system far from the critical point.

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“…The used values of d f and characterizing the fractal nature of the cluster of droplets are 2.49 and 2.21, respectively, and are the same as reported previously. 7 The validity of those values also suggests the applicability of the modified dynamical droplet model.…”

Section: Discussionmentioning

confidence: 81%

“…36,37 However, micellar solutions have exhibited a remarkable deviation at far from the critical point because of finite micellar size comparable with the correlation length. 7,8,30 We plotted the relationships of ⌫/k 3 vs k in panel ͑a͒ and 6⌫/k B Tk 3 vs k in panel ͑b͒ following the dynamic scaling theory in Fig. 5.…”

Section: Resultsmentioning

confidence: 99%

Near-critical dynamical behavior of an ionic micellar solution

Isojima

Fujii

Kubota

et al. 1999

The Journal of Chemical Physics

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Crossover critical phenomena in an aqueous electrolyte solution: Light scattering, density and viscosity of the 3methylpyridine + water + NaBr system Double critical behavior and micellar size effect in the multicomponent surfactant solution A series of experiments, static light scattering, dynamic light scattering, and shear viscosity, have been performed to study the critical properties of micellar solution of sodium dodecyl sulfate ͑SDS͒ and butanol in an aqueous solution of sodium chloride in terms of the modified dynamical droplet model. The exponents and ␥ for the long range correlation length and the osmotic compressibility were obtained as 0.736 and 1.374, respectively, in agreement with Fisher's renormalized Ising model. The experimental investigation on the dynamic critical behavior suggests that the modified dynamical droplet model, which assumes that the local fluctuations activated thermally behave as the physical clusters with a fractal dimension of d f ϭ2.49 and a polydispersity exponent of ϭ2.21, describes well the dynamical behavior of the SDS ionic micellar mixture together with an evaluation of the effective micellar size of 7-8 nm.

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Application of the dynamical droplet model to critical nonionic amphiphile-water micellar solutions

Cited by 13 publications

References 36 publications

Monomer Exchange and Concentration Fluctuations in Poly(ethylene glycol) Monoalkyl Ether/Water Mixtures. Dependence upon Nonionic Surfactant Composition

Monomer Exchange and Concentration Fluctuations in Poly(ethylene glycol) Monoalkyl Ether/Water Mixtures. Dependence upon Nonionic Surfactant Composition

Collective and self-diffusion coefficients in an ionic critical mixture: 3-methylpyridine+water+NaBr

Near-critical dynamical behavior of an ionic micellar solution

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