In order to compare the molecular Raman spectra between an optically isotropic phase and an anisotropic phase, a method is proposed having especially in view the study of transitions in lyotropic surfactant systems. Its application to the transition between the isotropic and hexagonal phases in the water-a-octyl-w-hydroxypentakis (oxyethylene) system shows that there is no significant molecular structure change at transition. This result suggests that all the micelles in the L, phase in equilibrium with the hexagonal phase have a cylindrical shape.

No abstract

No abstract

No abstract

No abstract