本研究利用聚二甲基矽氧烷(Polydimethylsiloxane, PDMS)的可塑性，以及低表面自由能的特性翻模具有通道的矽基板。我們將圖樣蝕刻在矽基板上，並且以不連續線段構成邊牆，並藉由翻模將結構複製到PDMS膜上。樣品內具有二維通道結構，使液晶分子被侷限在四周為PDMS材料的空間內。我們試圖探討此種結構對桿狀液晶配向的影響。
將樣品在正交偏光顯微鏡底下觀察可以發現明顯的亮暗態變化，同時利用聚光干涉檢測液晶分子在PDMS上具有良好的垂直配向。在光穿透強度檢測下，樣品中邊牆結構上的液晶分子在特定方位角具有最大光穿透度。我們透過這些檢測方式與預想模擬液晶排列的情形作對照，並作相關的討論。

The research use characteristic of plasticity and low free surface of Polydimethylsiloxane (PDMS) to copy the structure of silicon wafer chip which has channel etched on it. We etch particular graph with non continuous line segment on silicon wafer chip, and transfer the structure to PDMS film. There’s 2-dimensional channel structure in sample, and it makes liquid crystal molecule confined within the space enclosed by PDMS material. We try to discuss the influence of this kind of structure toward alignment of liquid crystal.
There’s visible change of bright and dark state when sample is set beneath crossed polarizer microscope. By conoscopy, we checked if liquid crystal molecule has proper vertical alignment on PDMS surface. The intensity of transmission light of liquid crystal on PDMS walls reaches the maximum under particular azimuth. Through these techniques, we compare real circumstance for alignment of liquid crystal to pre-simulation.

第一章 緒論 1
第二章 基本理論 3
2-1 液晶簡介 3
2-1-2 液晶的分類 3
2-1-2-1 向列型液晶(Nematic Liquid Crystal) 4
2-1-2-2 層列型液晶(Smectic Liquid Crystal) 5
2-1-2-3 膽固醇液晶(Cholesteric Liquid Crystal) 6
2-2 液晶物理特性簡介 7
2-2-1 秩序參數 7
2-2-2 光學異相性 8
2-2-3 介電異相性 9
2-2-4 連續彈性體理論 10
2-3 表面張力與表面能 11
2-4 接觸角概論 12
2-5 接觸角推算表面自由能理論 13
2-5 電漿表面改質原理 15
第三章 實驗材料與儀器 16
3-1 聚二甲基矽氧烷 16
3-2 液晶 18
3-3 具有結構之矽基板(Patterned Silicon wafer Chip) 19
3-4 接觸角量測儀(Contact Angle Measuring System) 20
3-5 光學顯微鏡(Optical Microscope) 22
3-5-1 聚光干涉檢測系統 23
3-5-2 穿透光強度量測 25
3-6 電漿清洗機(Plasma Cleaner) 27
第四章 實驗製程與觀察 28
4-1 翻模轉印法(Replica Molding Method) 28
4-2 樣品基板製作 28
4-2-1 ITO清洗 28
4-2-2 母板清洗及初步處理 29
4-2-3 PDMS翻模母板 29
4-2-3 上下基板製做與封裝樣品 30
4-3 PDMS薄膜特性 31
4-3-1 旋轉塗佈速率對PDMS薄膜厚度影響 31
4-3-2 旋轉塗佈速率對PDMS表面能之影響 32
4-3-3 環境溫度對PDMS表面能之影響 32
4-4 預傾角量測 33
4-5 電漿表面改質特性分析 34
4-5 PDMS翻模結構觀察 36
4-6 樣品光學圖像觀察 38
第五章 桿狀液晶在PDMS結構內排列之檢測 43
5-1 聚光干涉檢測 43
5-2 光穿透度量測 46
5-3 液晶分子在樣品內配向討論 49
第六章 結論與未來工作 52
6-1 總結 52
6-2 未來工作 52
參考文獻 54

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