论文标题
研究由强极分子制成的列液晶的二元混合物，具有相同的核心和恒定偶极子的拮抗方向
Studies on binary mixtures of nematic liquid crystals made of strongly polar molecules with identical cores and antagonistic orientation of permanent dipoles
论文作者
论文摘要
我们报告了有关光学（双折射，$Δn$），电介质$（δ\ varepsilon）$和弯曲式弹力弹性各向异性（$ΔK= k_ {33} -k_ {11}）$的实验研究永久性偶极子的核心和拮抗方向。特别是，附着在CCH-7的双环己烷核心的极性基团沿纵向方向定向，而在CCN-47中，它沿横向方向定向。我们表明，除了对光学和介电性各向异性的重要贡献外，强极群的拮抗方向在确定弯曲弹性弹性各向异性方面起着至关重要的作用。考虑到分子间缔合的作用以及分子的长度宽度比，根据牧师提出的模型来解释弹性特性。
We report experimental studies on optical (birefringence, $Δn$), dielectric $(Δ\varepsilon)$ and bend-splay elastic anisotropies ($ΔK=K_{33}-K_{11})$ of a few mixtures of two nematic liquid crystals, namely CCH-7 and CCN-47, made of highly polar molecules with identical cores and antagonistic orientation of permanent dipoles. In particular, the polar group (-CN) attached to the bicyclohexane core of CCH-7 is oriented along the longitudinal direction whereas, in CCN-47, it is oriented along the transverse direction. We show that apart from the significant contribution to the optical and dielectric anisotropies, the antagonistic orientation of strongly polar groups plays a crucial role in determining the bend-splay elastic anisotropy. The elastic properties are explained based on a model proposed by Priest, considering the effect of intermolecular association and the resulting length-to-width ratio of the molecules.
