Role of molecular shape on bent-core liquid-crystal structures.
Role of molecular shape on bent-core liquid-crystal structures.
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分子形状对弯芯液晶结构的作用。
DOI：
10.1103/physrevlett.99.207801
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发表时间：
2007
影响因子：
8.6
通讯作者：
A. Jákli
中科院分区：
文献类型：
--
作者：
C. Bailey;A. Jákli
我们展示了由分子取代和静电势产生的分子堆积的挫折如何使局部C1对称成为必要，并导致弯核液晶中的自发极化、展开和层弯曲。通过估计由于曲率引起的熵变，我们计算了驱动自发层弯曲和极化张开的弹性常数，并获得了这些变形的长度尺度。最后，我们提出了一个结构相图，描述了实验观察到的螺旋超结构，层波动，偏振展和自发纤维形成如何依赖于自发偏振的方向和大小。
We show how frustrations in molecular packing generated by molecular substitutions and electrostatic potentials necessitate a local C1 symmetry and lead to spontaneous polarization splay and layer bending in bent-core liquid crystals. By estimation of the entropic changes due to curvature, we calculated the elastic constants that drive the spontaneous layer bend and polarization splay and obtained length scales of these deformations. Finally, we propose a structural phase diagram which describes how the experimentally observed helical superstructures, layer undulation, polarization splay, and spontaneous fiber formation depend on the direction and magnitude of the spontaneous polarization.