臺灣博碩士論文加值系統

本論文研究以圓盤型液晶混合向列型液晶，和向列型液晶混合旋光性物質形成雙成份液晶複合系，探討兩複合系的相行為與光電特性，(圓盤型/向列型)液晶複合系在80/20~30/70 wt%下會產生誘導層列相，此誘導層列相可用特殊分子排列和堆疊方式解釋，而(向列型/旋光性物質)液晶複合系，則在低旋光比例(20%以下)誘導出N*相，中旋光比例(25~30%)誘導出包含BP和TGBA*等frustrated液晶相，高旋光比例(40~80%)則形成SmA*相，複合系分子排列的整齊性，隨旋光性物質含量增加和溫度的降低而逐漸提高，此複合系受電場大小和頻率變化的影響亦為研究課題。

Two binary liquid-crystalline composite systems were composed of (a nematogen and a discotic mesogen) and (a nematogen and a chiral dopant). The phase behaviour and optical-electro properties of two binary composites have been investigated. The former system yielded an induced SmA phase in the range of 80/20~30/70 wt.%. The layer-stacking structure of binary composite was proposed in the SmA phase. The latter system formed N* phase in the S811 content under 20 wt.%. The frusted phases, BP and TGBA*, and the SmA* phases were formed in the range 25~30% and 40~80%. The orientational ordering of the binary composites increased with increasing the chiral dopant content and decreasing sample temperature. The optical-electro properties were also investigated under the external electric field.

書名頁 ………………………………………………………………… i
論文口試委員審定書 ………………………………………………… ii
授權書 ………………………………………………………………… iii
中文摘要 ……………………………………………………………… iv
英文摘要 ……………………………………………………………… v
誌謝 …………………………………………………………………… vi
目錄 …………………………………………………………………… vii
表目錄 ………………………………………………………………… ix
圖目錄 ………………………………………………………………… x
第一章 緒論…………………………………………………………… 1
1.1 前言 ……………………………………………………………… 1
1.2 液晶的歷史 ……………………………………………………… 1
1.3 液晶的分類 ……………………………………………………… 2
1.4 膽石醇型液晶的性質 …………………………………………… 7
1.5 Frustrated phase ……………………………………………… 11
1.6 實驗目的 ………………………………………………………… 16
第二章 原理 ………………………………………………………… 17
2.1 液晶的基本性質 ………………………………………………… 17
2.2 Ｘ－ｒａｙ繞射原理 …………………………………………… 24
第三章 實驗方法 …………………………………………………… 32
3.1 實驗材料 ………………………………………………………… 32
3.2 實驗器材 ………………………………………………………… 34
3.3 樣品準備 ………………………………………………………… 34
3.4 偏光顯微鏡下的觀察 …………………………………………… 35
3.5 透光度測量 ……………………………………………………… 35
3.6 電場測量 ………………………………………………………… 36
3.7 螺旋截距的測量 ………………………………………………… 36
3.8 示差掃描熱卡計（ＤＳＣ）測量 ……………………………… 37
3.9 Ｘ－ｒａｙ繞射測量 …………………………………………… 37
3.10 液晶複合系反射率的測試 …………………………………… 38
第四章 結果與討論…………………………………………………… 41
4.1 純圓盤型液晶的性質 …………………………………………… 41
4.2 向列型／圓盤型液晶複合系 …………………………………… 44
4.3 向列型／旋光性物質液晶複合系 ……………………………… 56
第五章 結論 ………………………………………………………… 127
參考文獻 …………………………………………………………… 129

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