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A nonsymmetric liquid crystal dimer formed by covalently linking cyanobiphenyl and chiral salicyladimine mesogens through a heptamethylene spacer exhibits a new reentrant phase sequence, uniaxial smectic A–biaxial smectic A–uniaxial smectic A phase, below the blue phase–chiral nematic–twist grain boundary phases.
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Yelamaggad et al. (2009) studied this question.
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