Electro-optical and dielectric characterization of submicrometer-sized PDLC films

INERA Workshop 2016: Membrane and Liquid Crystal Nanostructures

Koduru, Hari Krishna^1,2

Georgi Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko chaussee, Sofia

1784, Bulgaria^1

Dipartimento di Fisica, Università degli Studi della Calabria, Via P. Bucci, Cubo 31C, Rende (CS)

87036, Italy^2

关键词: Alternating current;    Complex impedance spectroscopy;    Curable polymers;    Dielectric characterization;    Dielectric permittivities;    Electro-optical;    Photo-induced phase separation;    Polymer dispersed liquid crystals;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/780/1/012007/pdf
DOI  :  10.1088/1742-6596/780/1/012007

来源: IOP

【 摘 要 】

This report concerns thin films (25 m thickness) of polymer-dispersed liquid crystal (PDLC) composites having submicrometer-sized nematic liquid crystal domains. Such PDLC films were prepared by performing photo-induced phase separation of mixed soft material composed from the room-temperature nematic liquid crystal 4-n-heptyl cyanobiphenyl (7CB) and photo-curable polymer NOA-65. Being of interest for electro-optical (EO) and other applications driven by alternating-current electric field, the produced composites were studied by EO measurements and complex impedance spectroscopy. For the examined soft-solid composite material with a large content of submicro-confined nematic, was obtained information about the dielectric permittivity and molecular dynamics, useful for practice.