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. Here, 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.
Senyuk, B., Mundoor, H., Smalyukh, I. I., & Wensink, H. H. (2021). Nematoelasticity of hybrid molecular-colloidal liquid crystals. Physical Review E, 104(1). https://doi.org/10.1103/physreve.104.014703
Senyuk, B., Mundoor, H., Smalyukh, I. I., et al., "Nematoelasticity of hybrid molecular-colloidal liquid crystals," Physical Review E 104, no. 1 (2021), https://doi.org/10.1103/physreve.104.014703
@article{osti_1832241,
author = {Senyuk, B. and Mundoor, H. and Smalyukh, I. I. and Wensink, H. H.},
title = {Nematoelasticity of hybrid molecular-colloidal liquid crystals},
annote = {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. Here, 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.},
doi = {10.1103/physreve.104.014703},
url = {https://www.osti.gov/biblio/1832241},
journal = {Physical Review E},
issn = {ISSN 2470-0045},
number = {1},
volume = {104},
place = {United States},
publisher = {American Physical Society (APS)},
year = {2021},
month = {07}}
Ramaswamy, Sriram; Nityananda, Rajaram; Raghunathan, V. A.
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, Vol. 288, Issue 1https://doi.org/10.1080/10587259608034594
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Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 371, Issue 1988https://doi.org/10.1098/rsta.2012.0266