Abstract
We have studied the phase behavior and rheological property of the cubic phase and related gel emulsions in water/nonionic/dodecane systems. In the phase behavior study, it is pointed out that the formation of the discontinuous cubic phase (I 1) is not common in all nonionic surfactant systems; however, a cubic phase (I 1) with oil-swollen micelles or a cubic phase microemulsion is found in the water/C 16EO 6/dodecane system, which can solubilize large amount of oil. It was also observed that water/C 16EO 6/dodecane system forms stable gel emulsion. In the rheological study we have found an anomalous behavior of the I 1 phase in the water/C 12EO 6/dodecane and the water/C 16EO 6/dodecane systems. In the water/C 12EO 6/dodecane system, the viscoelastic nature of the I 1 phase has been observed, which is shifted to the elastic nature with the addition of dodecane, whereas, highly elastic nature was observed in the water/C 16EO 6/dodecane system. In both the cases shear-thinning behavior were seen. The elastic modulus, G′ and complex viscosity, | η∗| of the I 1 phase increase with the dodecane concentration in the water/C 12EO 6/dodecane system, whereas, decreasing trend have been observed in the water/C 16EO 6/dodecane system. This anomalous behavior is suggested due to the nonspherical shape of micelles or polydispersity of the micelles in the water/C 16EO 6/dodecane system. The rheological behavior of the O/I 1 gel emulsion was also studied in both the systems.
Published Version
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