Abstract
The lyotropic ternary mixture of dodecyltrimethylammonium bromide (DTMABr), 1-dodecanol (DDeOH) and water (H2O) was studied by optical conoscopy and Abbe refractometer techniques. The present mixture showed a large biaxial phase domain (NB) located between two different uniaxial ones in the partial phase diagram, one optically positive (ND) and the other negative (NC). The NB phase exhibits two optic signs as a function of the temperature , each of which was equal to the neighboring uniaxial phases. The temperature dependence of the refractive indices was measured along the NC-NB-ND phase transitions. In addition, we are reporting for the first time a new interpretation of the optical interference figures observed along the NB phase.
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