Disodium cromoglycate (DSCG) in mixtures with water forms a nematic state of high water concentration with cylindrical aggregates. Samples prepared with D2O were studied by deuteron magnetic resonance. The splitting of the D2O signal in the nematic range is reported for mixtures of D2O and DSCG varying in the molar ratio D2O/DSCG from 120 to 260 and for mixtures containing NaCl with molar ratios D2O/DSCG of 167 and 207 and NaCl/DSCG of 0.5 and 2. The splitting in the nematic range increases with decreasing temperature. At corresponding temperatures and for a given NaCl concentration the splitting is approximately inversely proportional to the D2O concentration. The addition of NaCl increases the temperature stability of the nematic range and reduces the temperature dependence of the splitting. It indicates that the addition of salt leads to stiffer aggregates.
Relation:
Molecular crystals and liquid crystals 80(1), pp.129-134
