Physical Review E
Polyphilic compounds were previously reported [F. G. Tournilhac, L. M. Blinov, J. Simon, and S. V. Yablonski, Nature 359, 621 (1992)] to form a longitudinal ferroelectric liquid crystal phase in the mixture M70 (70% compound 1, 30% compound II). The ferroelectric nature was confirmed by measurements of acoustically induced piezoelectric response and hysteretic behavior in the smectic-X' phase. We carefully examined the structure of the smectic-X' phase with high-resolution x-ray diffraction in an aligned sample and discovered bilayer structure, suggesting that molecules actually adopt antiferroelectric arrangement.
Shi, Yushan; Tournilhac, Francois G.; and Kumar, Satyendra (1997). Bilayer Smectic Order in a Mixture of Polyphilic Liquid-Crystals. Physical Review E 55(4), 4382-4384. doi: 10.1103/PhysRevE.55.4382 Retrieved from http://digitalcommons.kent.edu/phypubs/19