Investigation of temperature dependence of mesomorphism and refracting index of sodium dodecylsulphate + water + decanol lyotropic system

This work investigates the phase states of the sodium dodecylsulphate + water + decanol lyotropic system and determines the phase diagram of the system. We investigate the mesomorphic, morphologic, refracting and thermotropic properties of the lamellar D, hexagonal E, nematic-calamitic Nc and nematic-discotic Nd mesophases which take place in this system where we investigate large concentration and temperature intervals. The characters of texture transformations and peculiarities of the heterophase regions of the mesophase-isotropic liquid phase transitions have been studied. The character of change in refracting properties is compared with the morphologic and thermotropic properties in lamellar D, hexagonal E, nematic-calamitic Nc and nematic-discotic Nd mesophases. © 2007 Elsevier B.V. All rights reserved