On the structure of the Nx phase of symmetric dimers
  NMR measurements on a selectively deuteriated liquid crystal dimer CB-C9-CB exhibiting two nematic phases show that the molecules in the lower temperature nematic phase, Nx, experience a chiral environment and are ordered about a unique direction. The results are contrasted with previous reports that proposed a twist-bend spatial variation of the director. A structural model is proposed wherein the molecules show organization into highly correlated assemblies of opposite chirality. 
Anke Hoffmann, Alexandros G. Vanakaras, Alexandra Kohlmeier, Georg H.   Mehl and Demetri J. Photinos
cond-mat.soft cond-mat.mtrl-sci