4-n-Decylphenyl-3′-methyl-4′-(4″-nitro-benzoyloxy)benzoate (10 PMNBB) which exhibits the smectic A and nematic mesophases shows a large expansion (∼20%) of the bilayer spacing as it is cooled in the mesomorphic range. This is accompanied by a reversal in the sign of the dielectric anisotropy which becomes negative at lower temperatures.
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Madhusudana et al. (1982) studied this question.
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