Rotational viscosity measurements of bent-core nematogens

Unusual temperature dependence of the splay elastic constant of a rodlike nematic liquid crystal doped with a highly kinked bent-core molecule

“…Fitted W of the pure RLC was 5.4 × 10 −20 J and the magnitude was physically reasonable as reported in the theoretical prediction [32,33]. Although γ was increased by mixing BLC in most of the previous literature [34], our result showed a reduction of γ after doping BLC. Avci et al recently reported that BLC with an asymmetric shape could show relatively low viscosity [35].…”

From the Molecular Structure to Spectroscopic and Material Properties: Computational Investigation of a Bent‐Core Nematic Liquid Crystal

“…[15,18,19,22,23,74] and calculations have shown that it can be ascribed to the bent molecular shape. The most relevant feature is that K 3 is smaller than K 1 and remains almost constant over a wide temperature range.…”

“…[17]. [69][70][71] Very recently, the temperature dependence of the elastic constants was measured for the nematic phase of a number of bent-shaped mesogens, [18][19][20][21][22][23][72][73][74] with results similar to those for A131. For the bend-elastic constant, theoretical predictions are in good agreement with the experimental trend in the temperature region far from the smectic C transition: K 3 < K 1 is found, with K 3 scarcely dependent on temperature.…”

Unusual polarity-dependent patterns in a bent-core nematic liquid crystal under low-frequency ac field

“…BCNs usually exhibit low-frequency dielectric relaxation and have an in verted, K 33/K ]] < 1, elastic ratio; their viscosities can be three orders of magnitude higher compared to rodlike compounds [26,[28][29][30][31]. These special characteristics of typical BCNs are attributed to their bent molecular shape, the resulting preference for a polar ordering and thus the presence of cybotactic smectic clusters [32][33][34][35][36].…”