Jang, Y., Panov, V. P., Kocot, A., Lehmann, A.,Tschierske, C. and Vij, J. K., Short-range correlations seen in the nematic phase of bent-core liquid crystals by dielectric and electro-optic studies, Physical Review E, 84, 6, 2011
Physical Review E;84, 6
Three bent-core nematic liquid crystals having the same core but with different terminal groups, short (C4) and long (C7,C9) tails, are investigated by dielectric and electro-optic contrast spectroscopic techniques. C4 shows sign reversal in the dielectric anisotropy Δε′ as a function of both temperature and frequency, whereas C9 shows only negative Δε′ in the entire mesophasic region. The behavior of C7 is intermediate of the two. Results of a dielectric study show that both C7 and C9 exhibit strong short-range polar correlations normal to the director. The correlation lengths of these interactions are found to be similar to those from the x-ray scattering. An increased hindered rotation for C9 compared to C4 moves the dielectric dispersion for ε∥′ to much lower frequencies, such that C9 shows only negative Δε′ over the entire temperature range.
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