Ferro/anti-ferroelectric liquid crystal doped with ferroelectric nanoparticles

• Main Authors: Zhi-zhong Lin, 林志忠
• Other Authors: Jiunn-yih Lee
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/sj763x

碩士 === 國立臺灣科技大學 === 高分子系 === 95 === We report on an approach to modify liquid crystals (LCs) by dispersing ferroelectric nanoparticles. The LC material is chiral smectic LC (MHPOBC). The ferroelectric nanoparticles are BaTiO3 whose perovskite structure and particles size about 100nm. The ferroelectric nanoparticles were doped into MHPOBC. The relative concentrations of component were adjusted to give the final compound of 1wt%, 10wt%, 20wt% and 30wt%. We found the physical properties of LC material would be improved at 1wt%. For example phase transition temperature decrease, dielectric constant and spontaneous polarization (Ps) increase, optical response time shortening etc. But when concentration was increased over 10wt%, electric-optical properties would be decreased. It means particles’ volume effects begin to disturb alignment of LC molecules. Finally high concentration caused LC phase to break down and disappear at 30wt%.