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The elastic theory of chromonic liquid crystals is not completelyestablished. We know, for example, that for anomalously low twist constants(needed for chromonics) the classical Oseen- Frank theory may entailparadoxical consequences when applied to describe the equilibrium shapes ofdroplets surrounded by an isotropic phase: contrary to experimental evidence,they are predicted to dissolve in a plethora of unstable smaller droplets. Weproposed a quartic twist theory that prevents such an instability fromhappening. Here we apply this theory to the data of an experiment devised tomeasure the planar anchoring strength at the plates bounding a twist cellfilled with a chromonic liquid crystal; these data had before been interpretedwithin the Oseen-Frank theory. We show that the quartic twist theory affords aslightly better agreement with the experimental data, while delivering a largervalue for the anchoring strength.

What a twist cell experiment tells about a quartic twist theory for chromonics