本論文主要是將鐵電性奈米顆粒掺混鐵電/反鐵電性液晶，並量測掺混後的光電物性改變，本實驗所選用的液晶材料為光學活性層列型液晶(MHPOBC)，所掺混的鐵電性奈米顆粒為鈣鈦礦結構之BaTiO3，粒徑大小約100nm，掺混濃度分別為1wt%、10wt%、20wt%、30wt%。
由實驗發現當掺混濃度於1wt%之低濃度時，鐵電性奈米顆粒將對液晶材料的光電物性產生例如：相轉移溫度下降、介電常數、自發極化值提升、光學應答時間縮短等效應。這有助於提升液晶材料在顯示器或其他電子元件上的應用。但是當濃度增加至10wt%之後，高濃度的奈米顆粒將擾亂液晶分子的排列秩序，導致以上的光電物性下降。最後當掺混濃度達30wt%，液晶組織將受到高濃度的奈米顆粒破壞而瓦解。

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%.

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