Orientational transition of p-pentyl-p´-cyano-biphenyls triggered by conformational change of surface azobenzene monolayer

Author

Iwamoto, Mitsumasa ; Kato, Keisuke ; Matsumura, Atsushi ; Majima, Yutaka

Author_Institution

Dept. of Phys. Electron., Tokyo Inst. of Technol., Japan

fYear

1999

fDate

1999

Firstpage

602

Lastpage

605

Abstract

We examined the orientational transition process of p-pentyl-p´-cyano-biphenyl (5CB) molecules in liquid crystal (LC) cells triggered by the conformational change of the surface azobenzene monolayer on polyimide (PI) Langmuir-Blodgett (LB) films, by measuring the optical transmittance and the electrical capacitance at the same time. The experimental results were analyzed using a continuum theory describing the free energy of LC cells. The transmittance and the capacitance of the LC cells with 1-layer PI LB films changed reversibly by the alternating irradiation of ultra-violet (UV) and visible light

Keywords

Langmuir-Blodgett films; capacitance; dielectric liquids; free energy; light transmission; liquid crystal phase transformations; liquid crystals; molecular configurations; molecular reorientation; monolayers; ultraviolet radiation effects; 5CB molecules; alternating UV/visible irradiation; conformational change; continuum theory; electrical capacitance; free energy; liquid crystal cells; optical transmittance; orientational transition process; p-pentyl-p´-cyano-biphenyl; polyimide LB films; reversible changes; surface azobenzene monolayer; Capacitance measurement; Dielectrics; Electric variables measurement; Glass; Liquid crystal displays; Liquid crystals; Optical films; Polyimides; Polymer films; Time measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Dielectric Liquids, 1999. (ICDL '99) Proceedings of the 1999 IEEE 13th International Conference on

Conference_Location

Nara

Print_ISBN

0-7803-4759-5

Type

conf

DOI

10.1109/ICDL.1999.799007

Filename

799007