藉由各種向列型液晶並添加旋光性材料的實驗,了解在不同的溫度及外加電場下系統組織結構與變化,再添加偶氮染料,並觀察偶氮染料對整體系統的影嚮,試圖以添加偶氮染料的方式誘導出cholesteric相的planner結構。在電場變色的實驗中,利用電場控制液晶複折射率或膽石醇液晶的螺旋節距,再利用添加不同比例、不同種類的旋光性材料於向列型液晶/偶氮染料系統中的實驗,找出驅動電壓最小且顏色變化最豐富,旋光性材料添加的最佳比例。在圓偏光二色性實驗中,利用摻入的膽石醇液晶與旋光性材料的比例不同,使得每個系統中的螺旋節距不一樣,造成不同的顏色變化。
Dope with chiral material and use photochemical phase transformation to induce cholesteric phase. Apply electric field to change liquid crystal sample with variation of color and it’s used to in liquid crystal display. We use different degree of electric field to control liquid crystal’s birefringence or cholesteric liquid crystal’s helix pitch. Liquid crystal’s parallel axis was titled by applying electric field. The birefringence of liquid crystal molecular was caused polarized interference of two polarizars. Use different percentage of chiral material and different kind of cholesteric liquid crystal to control chiral pitch that cause different colors in selective reflection experiment.