NEMATIC ORIENTATION WITH POLYMER FILM TEXTURED BY STAMP NANOLITHOGRAPHY METHOD

Krakhalev, M.N., Tumashev, V.S., Seleznev, V.A., (...), Prishchepa, O.O., Zyryanov, V.Y.// Zhidkie Kristally i Ikh Prakticheskoe Ispol'zovanie//

Liquid crystal cells, in which the planar director orientation is specified by SU-8 polymer films treated by the stamp nanoprinting method, have been studied. The orienting film surface after texturing represents a comb-shaped lattice, the profile of which depends on the processing temperature. In cells filled with nematic LC E7, a homogeneous orientational structure with a small number of surface linear defects on both substrates is formed. These defects do not appear in LC cells with asymmetric substrates, when one of them is coated with an SU-8 film, and the other one is covered with a rubbed nylon-6 film. It has been shown that the director pre-tilt angle on the studied SU-8 films is close to zero and the films set a strong polar anchoring energy for the nematic E7. The results obtained are of interest for the development of methods for manufacturing LC devices using technologies for nanoprinting of orienting polymer films.