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Abstract
The existence of the induced helical smectic A (S*A) phase was proved by textural, optical and calorimetric studies and by small angle X-ray scattering using binary systems which consisted of achiral 4-n-hexyloxyphenyl 4-n-octyloxybenzoate (C ↔ Sc ↔ N ↔ I) and chiral N-(4-n-nonylphenylbenzoyloxy)benzylidene-S-1-benzylethylamine (C ↔ SA ↔ I). The induced S*A and cholesteric (N*) phases appeared even at small concentrations of the chiral compound (≈ 1 mol per cent) together with increases in the S*C ↔ S*A transition temperatures, compared those for the Sc ↔ N transitions, and decreases in the θc tilt angle. Structural factors are discussed as possible causes of the formation of the induced S*A blue phases I, II and III, and another polymorphic state in the systems studied.
