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Abstract
D-(2)-octylammonium chloride has been observed to form lyotropic liquid crystals in aqueous solutions. Cholesteric, nematic, and smectic phases will form depending on concentration, co-amphiphile content, ionic environment and temperature. The cholesteric textures displayed by aqueous mixtures of 1:2: 1 D-(2)-octylammonium chloride:decylammonium ch1oride:salt (NH4, Cl, KCl, LiCl, NaCl) were investigated for the dependence of the pitch upon such variables as the nature of the salt cation, salt concentration, pH and temperature. The investigative methods used include magnetic field orientation, differential scanning calorimetry, laser diffraction and optical microscopy. The results obtained include the dependence on the concentration of chiraldopants and compensation effects.