Spotaneous Alignment Behavior on a variety of substrates for Discotic Liquid Crystals of Perfluoroalkylated triphenylenes

Abstract

It was recently found that the fluorination of peripheral chains in triphenylene mesogens leads to the thermal enhancement of Colh mesophase stability and gives a strong tendency of spontaneous homeotoropic alignment behavior on a variety of substrates with the increase of fluorinated chain length. In this study, the alignment behavior is discussed in terms of the surface free energy estimated by contact angle measurements of the perfluoroalkylated triphenylene films on substrates.