Birefringence study on lyotropic micellar nematic phase in a binary mixture

作者：Govindaiah T N^*; Sreepad H R

来源：Phase Transitions, 2015, 88(7): 653-661.

DOI：10.1080/01411594.2015.1020309

• molecular orientation
• optical anisotropy
• phase transition
• binary mixture
• lyotropic nematic phase

We report the results of our studies on optical and thermal properties of two non-mesogenic compounds, namely, didodecyl dimethyl ammonium bromide (DDAB) and glacial acetic acid. The mixture exhibits schlieren texture of lyotropic micellar nematic (N-D), SmA, SmB, and SmG phases, respectively, at different concentrations of DDAB sequentially when the specimen is cooled from isotropic phase. The order parameter (S) of lyotropic micellar nematic (N-D) phase is estimated with the help of temperature dependence of optical anisotropy from the measured values of refractive index and density data. The temperature variation of order parameter of the experimental curve is in agreement with the Mayer-Saupe theoretical curve. The formation of the above phases has been confirmed by optical studies.

• 出版日期2015-7-3