In-situ Observation of the Orientational Order Parameter S2 of the Liquid Crystalline Ultra Thin Film on 6Az10PVA Monolayer

Abstract

The orientational order parameter S2 of the 4'-n-4-pentyl-cyanobiphenyl(5CB) ultra thin film on the 6Az10PVA (azobenzene side-chain polymer) monolayer was determined during 5CB deposition in the region of layer thickness between submonolayer thickness and several manometers. It was revealed that $S_2$ of the 5CB on the trans-form 6Az10PVA is greater than that of cis-form 6Az10PVA even in a few molecular thickness region. For 5CB film on the trans-form 6Az10PVA, S2 reaches maximum in the first 5CB layer.