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We investigate influence of different i onic additives on the phase behaviour and scalar order parameter of lyotropic chro monic nematic liquid crystals formed by the molecules representing derivatives of indanthrone. KI, (NH 4)2SO4 and NaCl salts increase biphasic nematic regi on on the temperature-concentration phase diagram, whereas the scalar orientational order parameter is hardly sensitive to their presence. We suggest that these change s are attributed to increase in the ag- gregate length and polydispersity of th e latter, while the interaction between ag- gregates remains unaffected. The Na2SO4 salt lowers anomalously the measured value of the scalar order pa rameter to 0.42, for which the nematic phase should not exist. We address this anomaly to modification of the shape of chromonic aggregates due to growing of side chains within the rod-like aggregates. The NH4Cl salt does not affect the phase diagra m and the scalar order parameter of Blue 250 chromonematic.

Chromonic nematic phase and scalar order parameter of indanthrone derivative with ionic additives