Properties of the Broad-Range Nematic Phase of a Laterally Linked   H-Shaped Liquid Crystal Dimer
  In search for novel nematic materials, a laterally linked H-shaped liquid crystal dimer have been synthesized and characterized. The distinct feature of the material is a very broad temperature range (about 50 oC) of the nematic phase, which is in contrast with other reported H-dimers that show predominantly smectic phases. The material exhibits interesting textural features at the scale of nanometers (presence of smectic clusters) and at the macroscopic scales. Namely, at a certain temperature, the flat samples of the material show occurrence of domain walls. These domain walls are caused by the surface anchoring transition and separate regions with differently tilted director. Both above and below this transition temperature the material represents a uniaxial nematic, as confirmed by the studies of defects in flat samples and samples with colloidal inclusions, freely suspended drops, X-ray diffraction and transmission electron microscopy. 
Young-Ki Kim, Randall Breckon, Saonti Chakraborty, Min Gao, Samuel N.   Sprunt, James T. Gleeson, Robert J. Twieg, Antal Jak...
cond-mat.mtrl-sci cond-mat.soft physics.optics