Abstract
ABSTRACT Lyotropic phases are derived from cetyl pyridinium chloride and sodium dodecyl sulfate surfactants via dissolving them in water and glycerol. A significant increase in the dielectric permittivity of lyotropic mixtures has been observed as a function of increasing temperature in all lyotropic phases irrespective of surfactant nature. A single relaxation peak corresponding to the Cole-Cole relaxation process has been observed for all the studied mixtures. Non-Arrhenius variation of the relaxation frequency seen for these lyotropic mixtures represents the Vogel-Fulcher-Tammann (VFT) behavior. An increase in dc conductivity is observed as a function of temperature, which becomes more prominent at a higher temperature > 50°C. Highest dc conductivity of the order of 10−4 S/m noticed for these systems is one of the key findings of this study. Optical studies confirm that aqueous and nonaqueous lyotropic mixtures exhibit a wide optical bandgap ranging from 4.0 to 4.5 eV.
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