Predicting for thermodynamic instabilities in water/oil/surfactant microemulsions: A mesoscopic modelling approach - Université de Montpellier Accéder directement au contenu
Article Dans Une Revue Journal of Chemical Physics Année : 2014

Predicting for thermodynamic instabilities in water/oil/surfactant microemulsions: A mesoscopic modelling approach

Résumé

The thermodynamics and structural properties of flexible and rigid nonionic water/oil/surfactant microemulsions have been investigated using a two level-cut Gaussian random field method based on the Helfrich formalism. Ternary stability diagrams and scattering spectra have been calculated for different surfactant rigidities and spontaneous curvatures. A more important contribution of the Gaussian elastic constants compared to the bending one is observed on the ternary stability diagrams. Furthermore, influence of the spontaneous curvature of the surfactant points out a displacement of the instability domains which corresponds to the difference between the spontaneous and effective curvatures. We enlighten that a continuous transition from a connected water in oil droplets to a frustrated locally lamellar (oil in water in oil droplets) microstructure is found to occur when increasing the temperature for an oil-rich microemulsion. This continuous transition translated in a shift in the scattering functions, points out that the phase inversion phenomenon occurs by a coalescence of the water droplets.
Fichier non déposé

Dates et versions

hal-02001423 , version 1 (31-01-2019)

Identifiants

Citer

Magali Duvail, Lise Arleth, Thomas Zemb, Jean-François Dufrêche. Predicting for thermodynamic instabilities in water/oil/surfactant microemulsions: A mesoscopic modelling approach. Journal of Chemical Physics, 2014, 140 (16), pp.164711. ⟨10.1063/1.4873357⟩. ⟨hal-02001423⟩
46 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More