本研究是以膽石醇型的液晶(E7+20wt%S-811)掺混低濃度誘電奈米顆粒的方式，量測誘電奈米顆粒掺混於液晶中對其光電物性的影響，所掺混的誘電奈米顆粒為鈣鈦礦之BaTiO3，粒徑大小約30nm。液晶分別掺混的濃度為0.1wt%、0.2wt%、0.3wt% BaTiO3，之後將其灌入厚度4μm且平行配向的試片中，研究掺混不同濃度的誘電性奈米顆粒對液晶的相轉移溫度、介電常數、閥電壓、應答時間、液晶螺旋節距等光電物性的影響。發現掺混少量誘電性奈米顆粒有助於提升液晶的光電物性，這是因為誘電奈米顆粒具有強大的偶極矩與永久極化現象，而造成誘電奈米顆粒與液晶分子間有著強大的交互作用。

Our research was used cholesteric liquid crystal (E7+20wt%S-811) doping with low concentrations ferroelectric nanoparticles, measuration ferro-electric nanoparticles to affect the LC electro- optic propertie.The ferro-electric nanoparticles are BaTiO3 whose perovskite structure and particles size about 30nm.The relative concentrations of ferroelectric nanoparticles were adjusted to give the final compound of 0.1wt%, 0.2wt% and 0.3wt%.Than put LC into the cell, the cell gap was 4μm and anti-parallel alignment.

Afterward discuss with diffation concentrations of ferroelectric nanoparticles which affect whit the LC phase transition temperature,
dielectric permittivity,threshold voltage,optical response time, theread pitch etc. We found low concentrations of ferroelectric nanoparticles in LC , the physical properties of LC material would be improved.Because ferro-
electric nanoparticles have the large dipole moment and polarizability,so strong interactions occur between the LC molecules and the particles.

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