Abstract
The change of three-phase behavior of a water/hexaethylene-glycol dodecyl ether (C12EO6)/propanol/heptane system was studied with increasing temperature (30.0–48.9 °C). A cone-like three-phase body consisting of aqueous (W), surfactant (Dp), and oil (O) phases is formed in the composition tetrahedron at lower temperatures. The body is expanded with increasing temperature, and touches the water–C12EO6–heptane triangle (the base) at 44.8 °C. At about 45.6 °C the loci of the Dp and O phases meet and cut off at a critical double end point and the three-phase body separates into two bodies: one has a chiral shape and the other is unclosed. The unclosed body is transformed with the change of shape of the tie triangle on the base as temperature increases and leaves from the base at 48.9 °C. A closed-loop miscibility gap between middle surfactant (D′p) and O phases or a cone-like three-phase body is formed inside the composition tetrahedron at higher temperatures. The roles of C12EO6 and propanol are also discussed.
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