Local orientational analysis of helical filaments and nematic director in a nanoscale phase separation composed of rod-like and bent-core liquid Crystals using small- and wide-angle X-ray microbeam scattering.

We analyzed the local nanostructure in binary mixtures of rod- and bent-shaped molecules, n-pentyl-4-cyanobiphenyl (5CB) and 1,3-phenylene bis[4-(4-n-octyloxyphenyliminomethyl) benzoates] (P-8-OPIMB), respectively, using small- and wide-angle X-ray microbeam and macrobeam scattering. From the orientational X-ray scattering patterns, we concluded that the nematic director of 5CB is almost parallel to the smectic layers dominated by bent-core molecules in Bx. Moreover, we observed oriented small-angle diffraction peaks (about 300 A), which is close to the spacing of 5–7 layers, and also consistent with the width of a helical nanofilament textures as observed by freeze–fracture transmission electron microscopy. The kinetics in B4 was also discussed based on the contact experimental method.