Nematoelasticity of hybrid molecular-colloidal liquid crystals,Physical Review E

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Nematoelasticity of hybrid molecular-colloidal liquid crystals
Physical Review E ( IF 2.2 ) Pub Date : 2021-07-19 , DOI: 10.1103/physreve.104.014703
B Senyuk ₁ , H Mundoor ₁ , I I Smalyukh _{1,

2,

3,

4} , H H Wensink ₅

Affiliation

Colloidal rods immersed in a thermotropic liquid-crystalline solvent are at the basis of so-called hybrid liquid crystals, which are characterized by tunable nematic fluidity with symmetries ranging from conventional uniaxial nematic or antinematic to orthorhombic [Mundoor et al., Science 360, 768 (2018)]. We provide a theoretical analysis of the elastic moduli of such systems by considering interactions between the individual rods with the embedding solvent through surface-anchoring forces, as well as steric and electrostatic interactions between the rods themselves. For uniaxial systems, the presence of colloidal rods generates a marked increase of the splay elasticity, which we found to be in quantitative agreement with experimental measurements. For orthorhombic hybrid liquid crystals, we provide estimates of all 12 elastic moduli and show that only a small subset of those elastic constants play a relevant role in describing the nematoelastic properties. The complexity and possibilities related to identifying the elastic moduli in experiments are briefly discussed.

中文翻译：

混合分子-胶体液晶的线弹性

浸入热致液晶溶剂中的胶体棒是所谓的混合液晶的基础，其特征是可调的向列流动性，对称性范围从传统的单轴向列或反向向到正交[Mundoor et al. ,科学 360, 768 (2018)]。我们通过考虑单个杆与嵌入溶剂之间通过表面锚定力的相互作用以及杆本身之间的空间和静电相互作用，对此类系统的弹性模量进行了理论分析。对于单轴系统，胶体棒的存在会显着增加张开弹性，我们发现这与实验测量值定量一致。对于正交杂化液晶，我们提供了所有 12 个弹性模量的估计值，并表明这些弹性常数中只有一小部分在描述线弹性特性方面发挥了相关作用。简要讨论了与在实验中识别弹性模量相关的复杂性和可能性。

更新日期：2021-07-20

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