ZB 10 - Soft Condensed Matter (R. Holyst)

Periodic surfaces and cubic phases in mixtures of oil, water, and surfactant

Author(s): Ciach, A and Holyst, R
Title: Periodic surfaces and cubic phases in mixtures of oil, water, and surfactant
Abstract: (W)e study a ternary mixture of oil, water, and surfactant in the case equal volume fractions of oil and water using the Landau-Ginzburg derived from a lattice model of this ternary mixture. We on a phase region close to a coexistence line between and cubic phases. In our model the bicontinuous cubic exist in a narrow window of the volume fraction of surfactant to 0.6. The sequence of phase transitions is ->C as we increaser rho(s) along the cubic-microemulsion line. Here L stands for the lamellar phase and C for the micella phase. The gyroid G, primitive P, and diamond D phases are bicontinuous. The transitions weakly depend on the temperature. The of rho(s) is accompanied by the increase of the surface area unit volume. In the case of fluctuating monolayers the interface is and the average area of the monolayer per unit volume is larger the projected area,'' i.e., the area of the surface describing average position of the monolayer, per unit volume. The effect is strongest in the L and the weakest in the C structure. (C) 1999 American Institute of Physics. [}S0021-9606(99)51306-8].
Pages: 3207-3214
Journal: JOURNAL OF CHEMICAL PHYSICS
Volume: 110
ID: ISI:000078379800055
Year: 1999
DOI: 10.1063/1.477842