A stability theory of phase equilibrium for microemulsions of lamellae and spherical droplets

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概要

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• The stability and the coexistence of water-in-oil (W/O) microemulsions and the stacked lamellar phase of oil, water, and surfactant are examined by way of a simple model. The spherical droplets are assumed to have their own spontaneous radius and bending elasticity. The lamellar phase is postulated to have two independent potential wells between surfactant monolayers in which the water and oil layers are stacked alternatively between the monolayers. The free energies of the lamellar phase and the spherical microemulsion phase are calculated as functions of fractions of the three molecules of water, oil and surfactant. From the free energy curves in the ternary diagram, the trangential plane and the tie lines can be drawn. As a result, the following four combinations of phases are expected to realize in the tie ternary diagram ; the single phase of lamellae ; two phases of lamellae and coexisting aqueous solvent ; two phases of lamellae and oil with W/O microemulsions ; three phases of lamellae, oil with W/O microemulsions and the aqueous phase. The observed ternary diagrams by Kunieda and Shinoda (H. Kunieda and K. Shinoda, <I>J. Dispersion Sci.</I> Tech. 3, 233 (1982)) have been analyzed according to our model.

• 日本膜学会の論文

著者

• Ichinose Hiroyuki

  Physics Laboratory Saga Medical School

• Suezaki Yukio

  Physics Laboratory Saga Medical School

• ICHINOSE Hiroyuki

  Physics Laboratory, Department of General Education, Saga Medical School

• SUEZAKI Yukio

  Physics Laboratory, Department of General Education, Saga Medical School

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• A stability theory of phase equilibrium for microemulsions of lamellae and spherical droplets

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