Abstract
The phase diagram of a water/polyoxyethylene(50.8) oleyl ether (C18:1EO50.8)/m-xylene system was constructed at 25 °C. In the binary water/C18:1EO50.8 system, an aqueous micellar (Wm) phase and a discontinuous cubic (I1) phase form. In the relatively dilute region, an excess oil phase separates from these phases upon addition of m-xylene. In the concentrated region, however, the I1 phase changes to a lamellar (Lα) phase via hexagonal (H1) and bicontinuous cubic (V1) phases with increasing oil content. According to the effective cross-sectional area of one surfactant molecule as in the liquid crystals calculated from the small-angle X-ray scattering (SAXS) data, the curvature of the surfactant molecular layer remains positive in the dilute region although m-xylene molecules penetrate into the surfactant palisade layer. The penetration effect of m-xylene is large and the I1−H1−V1-Lα phase transition takes place in the concentrated region, because the hydration of the EO chain decreases. However, the negativ...
Published Version
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