Light scattering study of the critical behaviour in a ternary microemulsion system

Honorat, P.; Roux, D.; Bellocq, A. M.

doi:10.1051/jphyslet:019840045019096100

Cited by 45 publications

(15 citation statements)

References 31 publications

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“…[1][2][3] For the mixture with ω ) 40. 8 and a volume fraction of the droplets φ c ) 0.098, one observes a lower consolute critical point. Above T c the mixture separates into two microemulsion phases of different composition but with the same ratio ω.…”

Section: Introductionmentioning

confidence: 92%

Critical Behavior of a Pseudobinary System for a Three-Component Microemulsion

Feng

Shen

1996

J. Phys. Chem.

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A three-component microemulsion system can be regarded as a pseudobinary mixture at certain conditions. The coexistence curves of (T, n), (T, φ), and (T, Ψ) (n and φ are refractive index and volume fraction,) for a ternary microemulsion (AOT-waterdecane) at constant pressure and a constant ratio of water to AOT have been determined within about 10 K from the critical temperature by measurements of refractive index. The critical exponent was deduced precisely from (T, n), (T, φ), and (T, Ψ) coexistence curves within 1.5 K above T c . These values were 0.327, 0.324, and 0.325, respectively, and were consistent with the 3D Ising exponent. The volume fraction φ is a better choice of the concentration variable than Ψ used for construction of the order parameter to fit the Ising behavior.

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Section: Introductionmentioning

confidence: 92%

Critical Behavior of a Pseudobinary System for a Three-Component Microemulsion

Feng

Shen

1996

J. Phys. Chem.

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“…Over the past few years a large number of papers have been devoted to the experimental study of critical phenomena in mixtures involving surfactants. Two-, three-, four-, and even five-component systems were investigated [1][2][3][4][5][6][7][8][9][10][11]. This current experimental interest in the critical behaviour of micellar and microemulsion solutions is due, to a great extent, to the very intricate results obtained so far.…”

Section: Introducfiommentioning

confidence: 99%

Experimental evidence for a continuous variation of effective critical exponents in a microemulsion system

1985

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2014 Nous présentons des résultats obtenus par diffusion de la lumière en différents points d'une ligne critique d'un système microémulsion quaternaire. Cette ligne débute par un point critique extreme. Les points critiques ont été approchés, soit en faisant varier la température à composition constante (chemin I), soit en faisant varier le rapport eau sur savon (X) à température constante (chemin II). Pour chaque point critique examiné, les valeurs des exposants critiques 03BD et 03B3 mesurées le long des deux chemins sont proches. Elles varient continûment des valeurs d'Ising à des valeurs très petites quand le point critique considéré s'approche du point critique extreme. Ce comportement critique complexe est analysé à l'aide des résultats du diagramme de phase. Abstract 2014 We present light scattering results obtained for a four-component microemulsion system in several distinct positions of a critical line. This line starts at a critical end point The critical points were approached either by raising the temperature at fixed composition (path I) or by increasing the water over surfactant ratio X at constant temperature (path II). For each critical point investigated, the critical exponents 03BD and 03B3 associated with the X variable (path II) are close to those obtained with the temperature (path I). They vary continuously from the Ising values to largely smaller ones as the critical end point is approached. This complex critical behaviour is discussed in relation with the phase diagram findings.

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“…Indeed, binary solutions of nonionic surfactant show a good agreement with the 3D Ising model prediction 38,39 and multicomponent surfactant mixtures exhibit renormalized Ising behavior, e.g., ϭ0.70Ϫ0.76 for AOTϩWaterϩDecane. [40][41][42][43] Even if the sample concentration is the same as our experiment, Abillon reported that this mixture has ϭ0.62. 17 But their value of exponent was evaluated over the temperature range of ϳ10 Ϫ3 Ͻ(T C ϪT)/T C Ͻ8.0ϫ10 Ϫ3 .…”

Section: Discussionmentioning

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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Light scattering study of the critical behaviour in a ternary microemulsion system

Cited by 45 publications

References 31 publications

Critical Behavior of a Pseudobinary System for a Three-Component Microemulsion

Critical Behavior of a Pseudobinary System for a Three-Component Microemulsion

Experimental evidence for a continuous variation of effective critical exponents in a microemulsion system

Near-critical dynamical behavior of an ionic micellar solution

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