Abstract
We have investigated the effects of glycerol on the formation and rheological behavior of cubic phase (I 1) and related O/I 1 gel emulsion in a water/C 12EO 8/dodecane system at 25 °C. The phase behavior of the water/C 12EO 8/dodecane system was studied by optical observation and structures of different liquid crystalline phases were identified by small-angle X-ray scattering (SAXS) techniques. Addition of dodecane (2 wt%) to aqueous solutions of C 12EO 8 in a concentrated region (40 wt%) leads to the formation of the I 1 phase (which was absent without the addition of oil). The I 1 phase solubilized some amount of oil and at higher oil concentrations the I 1 + O phase was formed, allowing the preparation of O/I 1 gel emulsion. Rheological measurements have shown that the complex viscosity, | η ∗ | , of the I 1 phase is tremendously high ( ∼ 10 7 Pa s ) and it increases with increasing oil concentration, attains a maximum value near the phase boundary, and then decreases drastically in the I 1 + O region. The increasing | η ∗ | or decreasing tan δ ( G ″ / G ′ ) can be ascribed with the interactions among the neighboring micelles. The decreasing trend of the | η ∗ | in the I 1 + O region is simply due to the low volume fraction of the I 1 phase. It has been shown that glycerol decreases the viscosity of the I 1 phase and related gel emulsion, which is due to the I 1–hexagonal phase (H 1) microstructural transition. Digital images show the physical appearance of the emulsion, which depends on the glycerol concentration changes from translucent to transparent.
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