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Binary mixtures of the twist-bend nematic-forming liquid crystal CB7CB withthe prototypical rod-like liquid crystal 5CB exhibit a twist-bend nematic phasewith properties similar to those reported for neat CB7CB. The mixtures appearhomogeneous, with no micron- or nano-scale segregation evident at anyconcentration. The linear dependence of the phase transition temperature onconcentration indicates that these binary mixtures are nearly ideal. However, adecrease in the viscosity with the addition of 5CB allows the characteristictwist-bend stripe textures to relax into a state of uniform birefringence. Weconfirm the presence of nanoscale modulations of the molecular orientation inthe mixtures by freeze-fracture transmission electron microscopy (FFTEM),further evidence of their twist-bend nature. We devise and implement astatistical approach to quantitatively measure the ground state pitch of thetwist-bend phase and its mixtures using FFTEM. The addition of 5CB generallyshifts the measured ground-state pitch distributions towards larger pitch.Interestingly, the pitch appears to increase discontinuously by ~10 nm at the50 wt% concentration of 5CB, indicating that the twist-bend phase undergoes astructural transition at higher 5CB concentrations.

The twist-bend nematic phase of bent mesogenic dimer CB7CB and its mixtures