中文摘要
對液晶顯示器來說控制液晶分子的排列對顯示器的良率是很重要的。現在工業界最常使用的方法為摩擦，以絲絨布摩擦聚合物塗佈的玻璃基板顯示器，創造微溝槽。Berreman理論指出，液晶方子會沿著微溝槽的方向排列。另外，一些文獻也指出摩擦會造成表面層的高分子鏈定向排列，致使液晶分子也會沿著高分子鏈而排列。即使是現在也還不清楚摩擦表面的過程中是如何造成液晶分子有秩序地進行排列。
本論文描述了系統的研究物理與化學對液晶分子定向排列的的影響。我們使用傅立葉轉換紅外線光譜儀(Fourier transform infrared spectroscopy，FT-IR)確定表面化學官能基的變化，接觸角量測(Contact Angle meter，CA)以確定表面能和原子力顯微鏡(Atomic Force Microscope，AFM)去觀察液晶分子在表面上的排列。在這項研究中，我們深入的了解在固-液界面上，物理和化學效應影響表面的分子排列。我們的研究結果不僅可應用於液晶顯示器的技術，更普遍於生物芯片和生物傳感器裝置。

Controlling the orientation of liquid crystal molecules in LC displays is extremely important for optimizing device performance. The method most commonly used in industry today involves rubbing the surface of the polymer-coated glass substrates used in the displays with a velvet cloth to create microscopic grooves. Berreman theory states that the liquid crystal molecules then align along the direction of the grooves. Alternatively, some literature shows that the friction caused by rubbing aligns the polymer chains in the surface layer which then attract and align the liquid crystal molecules along the direction of the chains. Even now, it is still unclear exactly how the process of rubbing the surface causes the liquid crystal molecules to align in an orderly manner.
This thesis describes a systematic study of the physical and chemical influence of the substrate on the alignment and orientation of liquid crystal molecules. We used Fourier Transform Infrared spectroscopy (FTIR) to identify surface chemistry, contact angle measurements to determine the surface energy, and atomic force microscopy (AFM) to observe the alignment of liquid crystal on the surfaces. In the course of this study, we have gained insight into how the physical and chemical properties of the surface affect the molecular arrangement in the solid-liquid interface. Our results can be applied not only to LCD technology, but more generally to biochips and biosensor devices.

中文摘要 i
英文摘要 ii
目錄 iii
圖目錄 v

第壹章 緒論 1
1-1前言 1
1-2研究背景 2
1-3研究目的 4
第貳章 儀器與實驗 5
2-1接觸角儀(Contact Angle) 5
2-1.1接觸角儀理論 5
2-2傅立葉轉換紅外線光譜儀(FT-IR) 8
2-3原子力顯微鏡(Atomic Force microscopy) 10
2-3.1原子力顯微鏡的簡介 10
2-3.2原子力顯微鏡的工作模式 11
2-4相位式原子力顯微鏡(Phase Imaging Microscope) 14
2-5側向力顯微鏡(Lateral Force Microscope) 15
2-6實驗材料 16
2-6.1高分子聚合物 16
2-6.2液晶分子 17
2-7溶液法 19
2-7.1 Zone casting 19
2-7.2 Dip coating 19
2-7.3 Flow - Induced Alignment 20
第參章 電漿誘導PDMS表面的圖案化 21
3-1前言 21
3-2實驗方法 23
3-2.1樣品製備 23
3-2.2特性分析 25
3-3結果與討論 25
3-4結論 34
第肆章 結果與討論 36
4-1物理效應對Discotic liquid crystal(DLC)排列的影響 36
4-1.1 AFM對基板的檢測 36
4-1.2 PDMS基板接觸角的量測 37
4-1.3物理效應對DLC的影響 41
4-2化學效應對DLC的影響 48
4-2.1基板特性的檢測 48
4-2.2 Fill in液晶分子 49
4-3物理加化學效應對DLC的影響 52
4-3.1 Attachment液晶酸分子 52
4-3.2 Attachment液晶酯分子 56
第伍章 結論 62
第陸章 未來展望 63
參考文獻 64

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