Proceedings PaperModified properties of liquid crystals by liquid crystal dimers (Conference Presentation)
It was discovered recently that liquid crystal dimers with a flexible central linkage with an odd number of carbons, such as CB7CB, have bent molecular shapes and have anomalously small bend elastic constants. When such a dimer is doped into regular liquid crystals, it can greatly modify the properties of the hosts and can enable novel structures and electro-optical properties. We doped CB7CB to a regular thermotropic nematic liquid crystal and then dispersed the material in isotropic polymer with tangential anchoring condition, we obtained toroidal liquid crystal droplets, which was only realized before for lyotropic liquid crystals. When we doped CB7CB to a regular cholesteric liquid crystal, we obtained perfect planar state without any oily streak defects. Also by doping CB7CB to a cholesteric liquid crystal, we achieved stable Helfrich deformation and reflection color tuning under low driving voltages.