Abstract
Upon studying the binary phase diagram benzoyloxy-(4’-n pentylphenyl) benzoate (DB5for short)/Terephtalidene bis-(4-n-buyulaniline) (TBBA), Sigaud and coworkers1evidenced the existence of a weakly first order transition between two apparently identical smectic A phases. This unusual behavior was immediately related to the strong electric dipole of the DB5 molecule and considerable experimental efforts2,3,were subsequently made to investigate other polar compounds of the following type
R—Φ—X—Φ—Y—Φ—Z
where
Z=—CN or—NO2
R=CnH2n+1—,CnH2n+1—O—
X Y= —, —CH = CH—, —COO—, —OCO—,…
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Barois, P., Pommier, J., Prost, J. (1992). Frustrated Smectics. In: Lam, L., Prost, J. (eds) Solitons in Liquid Crystals. Partially Ordered Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-0917-1_6
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