Liquid Crystal Institute and Chemical Physics Interdisciplinary Program, Kent State University, Kent, Ohio 44242, USA.
Phys Rev Lett. 2012 Jul 20;109(3):037801. doi: 10.1103/PhysRevLett.109.037801. Epub 2012 Jul 18.
Using a magnetic Frederiks transition technique, we measure the temperature and concentration dependences of splay K1, twist K2, and bend K3 elastic constants for the lyotropic chromonic liquid crystal sunset yellow formed through noncovalent reversible aggregation of organic molecules in water. K1 and K3 are comparable to each other and are an order of magnitude higher than K2. At higher concentrations and lower temperatures, K1 and the ratios K1/K3 and K1/K2 increase, which is attributed to elongation of self-assembled lyotropic chromonic liquid crystal aggregates, a feature not found in conventional thermotropic and lyotropic liquid crystals formed by covalently bound units of a fixed length.
我们使用磁 Frederiks 相变技术，测量了形成于水中的有机分子非共价可逆聚集的溶致变色各向异性液晶日落黄的温度和浓度依赖的 splay K1、 twist K2 和 bend K3 弹性常数。K1 和 K3 彼此相当，并且比 K2 高一个数量级。在较高浓度和较低温度下，K1 以及 K1/K3 和 K1/K2 的比值增加，这归因于自组装溶致变色各向异性液晶聚集体的伸长，这是在由固定长度的共价键合单元形成的传统热致和溶致液晶中未发现的特征。
