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We report the thermotropic properties and measurements of the temperature and concentration dependences of the refractive index in isotropic micellar L1 phase and nematic-calamitic NC mesophase of the hexadecyltrimethyl ammonium bromide/water (CTAB/H2O) and hexadecyltrimethyl ammonium bromide/water/1-decanol (CTAB/H2O/DeOH) lyotropic liquid crystalline systems. The effect of amphiphile and aliphatic...