Photoorientation of Liquid Crystalline Azo-Dendrimer by Nanosecond Pulsed Laser for Liquid Crystal Alignment

• DOI: 10.1021/ma062262c
• Publication Date: 2007-03-28T10:01:42Z
• Authors: Xin Li; Xuemin Lu; Qinghua Lu; Deyue Yan
• Keywords: Azobenzene; Nanosecond

Upon irradiation with nanosecond pulsed UV laser, surface periodic microstructure and photoorientation occurred simultaneously on the azobenzene functionalized liquid crystalline dendrimer films. The orientation of azo groups was perpendicular to polarization laser dependent fluence. in-plane presented parabola-shaped behavior increase fluences. out-of-plane reorientation closely related thermal effect induced in procedure irradiation, which led transformation phase state from smectic crystal isotropic phase. Annealing irradiated film at its temperature resulted dramatic enhancement redistribution groups. Liquid alignment controlled by a cooperative topography anisotropic molecular simultaneously. Both factors can be modulated annealing treatment. After annealing, molecules changed direction microgrooves that orientation.