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研究生：	張志榮 Chang, Chih-Juang
論文名稱：	氫氧基硬酯酸參雜向列相液晶材料之多重穩態特性及其應用之研究 Studies of multi-stable characteristics of 12-Hydroxysteric Acid ( HSA ) doped nematic liquid crystal material and its application
指導教授：	傅永貴 Fuh, Yung-Kuei
學位類別：	碩士 Master
系所名稱：	理學院 - 物理學系 Department of Physics
論文出版年：	2011
畢業學年度：	99
語文別：	中文
論文頁數：	65
中文關鍵詞：	液晶、多重穩態、氫氧基硬酯酸
外文關鍵詞：	liquid crystal, multi-stable, 12-Hydroxysteric Acid ( HSA )
相關次數：	點閱：59 下載：2
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本論文研究當自組織材料摻雜在液晶中時，其多重態的特性及其相關應用。藉由自組織材料(十二氫氧基硬酯酸；HSA)分子間的作用力-氫鍵，使液晶達到凝膠狀態，進而穩固液晶的排列。當樣本無配向處理時，HSA可將液晶穩固在起始的雜亂排列之散射態。藉由特定的操作流程，HSA亦可液晶穩固在垂直排列之穿透態，甚至可以穩固在任意程度的半穿透態。亦即達到多重穩態的效用，此特點可達到省電的效能。關於影響散射-穿透態的多重穩態特性之參數皆已被最佳化。並且利用此特性做一光學遮光器元件。此外，當樣本為水平配向時，HSA可將液晶穩固在起始的水平排列。經特定的操作流程後，亦可將液晶的導軸方向穩固在任意方向。此水平-垂直排列之多重穩態的特性亦被最佳化。我們並利用此特性結合光配向，做一具多重穩態之相位光柵。此相位光柵可經特定操作流程後使得液晶分子穩固在不同的傾角，進而穩固在不同的繞射效率。

This thesis studies the multi-stable characteristics of self-assembly material doped nematic liquid crystals and its applications. The interaction force between self-assembly molecules (12-Hydroxysteric Acid; HSA) is resulted from hydrogen bonds. It can make the HSA doped LC material to become a gel medium, and can stabilize the alignment of LC molecules. For the cell without alignment films, HSA can make LCs to be stabilized in a scattering state. After being operated with proper process, LCs can be stabilized in a homeotropic (transmittance) state, and even can be stabilized in multi-stable transmittance, which can be used to save power consumption. The scattering/transmittance-state multi-stable characteristic has been optimized. In addition, such a feature is used to fabricate an optical shutter. For a homogeneous sample, HSA can stabilize the director of LCs being aligned in any direction after a specific process. The homogeneous-/homeotropic-state multi-stable characteristic is also optimized. The use of the characteristic described above and photo-alignment method to fabricate a multi-stable phase grating is demonstrated. This phase grating can stabilize the director of LCs being aligned in any tilt angle after a specific process. So that it can stabilize at different diffraction efficiency.

中文摘要..................................................Ⅰ
英文摘要..................................................Ⅱ
目錄......................................................Ⅳ
表目錄....................................................Ⅶ
圖目錄....................................................Ⅷ


第一章  緒論...............................................1
第二章  液晶簡介...........................................2
        2.1 定義...........................................2
	2.2 液晶分類.......................................3
            2.2.1 低分子液晶...............................4
            2.2.2 高分子液晶...............................8
	2.3 液晶物理.......................................9
            2.3.1 光學異向性與雙折射性....................10
            2.3.2 介電常數異向性..........................13
            2.3.3 秩序參數................................14
            2.3.4 黏滯係數................................15
            2.3.5 連續彈性體理論..........................16
第三章  論文相關理論......................................18
        3.1 自組織材料穩固液晶分子排列....................18
        3.2 光引致染料分子轉向效應........................19
            3.2.1 正力矩效應..............................20
            3.2.2 負力矩效應..............................22
            3.2.3 吸附效應引致液晶排列....................23
        3.3 溝槽理論......................................24
        3.4 光柵理論......................................25
第四章  實驗方法與過程....................................27
        4.1 樣品配製......................................27
            4.1.1 材料介紹................................27
            4.1.2 樣品製作過程............................32
        4.2 實驗過程......................................35
            4.2.1 HSA摻雜液晶在無配向Cell中的特性.........35
            4.2.2 HSA摻雜液晶在水平配向Cell中的特性.......38
            4.2.3 製作相位光柵............................41
第五章  實驗結果與討論....................................44
        5.1 HSA摻雜液晶在無配向Cell中的特性...............44
            5.1.1 不同加熱溫度的影響......................46
            5.1.2 不同外加電壓的影響......................47
            5.1.3 T-V curve量測、不同Cell gap及HSA濃度的影響......................................48
            5.1.4 利用光控切換不同穿透度..................50
            5.1.5 應用....................................51
        5.2 HSA摻雜液晶在水平配向Cell中的特性.............52
            5.2.1 不同HSA濃度的影響.......................53
            5.2.2 不同Cell gap的影響......................55
            5.2.3 不同外加電壓的影響......................55
            5.2.4 利用照光控制液晶分子穩定在水平排列或垂直排列......................................57
            5.2.5 應用-相位光柵...........................58
第六章  結論與未來展望....................................61
        6.1結論...........................................61
        6.2 未來展望......................................62

參考文獻..................................................63

                                    

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