Effects of Salt on the Orientational Order in Decylammonium Chloride/Ammonium Chloride/Water Systems

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Abstract
The effect of NH4Cl on the temperature dependence of deuterium oxide splitting (water order) and proton line width (surfactant order) in decylammonium chloride (DACl), D2O systems is reported. The molar ratio of DACl to D2O was held constant at .085 and the molar ratio of NH4Cl to D2O was varied from .012 to .029. We find for the above concentration ranges that in the nematic range the relative temperature dependence of the D2O splitting is little affected by changes on salt concentration. The slopes of the proton line widths as a function of temperature decrease with increasing salt concentration. The results are compared with earlier data on salt effects on order obtained with the disodium cromoglycate system.