Abstract
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 N c and nematic-discotic N d 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 N c and nematic-discotic N d mesophases.
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