Columnar and smectic ordering in a TGBA phase

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Abstract
Optical textures characteristic of cholesteric and columnar structures were simultaneously detected for the first time in the same mesophase of a liquid crystal. However, X-ray diffraction measurements show that the mesophase under consideration is smectic A in nature. We show here that the compound presents, indeed, a twist grain boundary (TGB) phase within a large temperature range, and we propose an explanation of the supramolecular organization in this phase

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