臺灣博碩士論文加值系統

本研究是使用膽固醇液晶摻雜矽奈米粒子製作可轉動的繞射光柵，繞射光柵的原理是利用膽固醇液晶在厚度(d)/螺距(p)足夠小時，產生指紋結構(Fingerprint)條紋，具混和(Hybrid)配向之膽固醇液晶的光柵在施加電壓後會隨電場而轉動，實驗中我們使用兩片玻璃基板做雙面水平配向處理，並利用矽奈米粒子摩擦帶負電特性，施加大DC電場使奈米粒子游離至基板一側形成混和結構，之後再加入不同大小的AC電場，達到光柵繞射點順時針旋轉，改變施加大DC電場的方向，則可使繞射點逆時針轉動，達到調控角度的效果。

In this study, a rotating diffraction grating was fabricated using silica-nanoparticle-doped cholesteric liquid crystals (CLC). The principle is that cholesteric liquid crystals generate a fingerprint structure when the thickness(d)/pitch(p) is small enough. The CLC diffraction grating with hybrid alignment rotates with the electric field when a voltage is applied to the sample. In this experiment, we used two glass substrates treated with horizontal alignment. The electrophoretic characteristics of silica nanoparticles, which is controlled by the polarity of the applied electric field, results in a hybrid structure. After the application of the positive DC voltage pulse, the diffractive points rotated clockwise when the AC voltage increased. If the direction of DC electric field was changed, the diffraction pattern rotated anti-clockwise. The diffractive angle could be modulated by the magnitude of AC voltage.

中文摘要……………………………………………………………………………….i
英文摘要………………………………………………………………………………ii
誌謝………………………………………………………………………………...…iii
目錄………………………………………………………………………………...…iv
圖目錄………………………………………………………………………………...v
符號說明……………………………………………………………………………..viii
第一章 緒論…………………………………………………………………………..1
第二章 液晶簡介……………………………………………………………………..2
2.1 何謂液晶………………………………………………………………………….2
2.2 液晶分類………………………………………………………………………….3
2.3 液晶物理……………………………………………………………………….....8
第三章 實驗相關理論………………………………………………………………14
3.1 膽固醇液晶理論………………………………………………………………...14
3.2 電泳動現象……………………………………………………………………...19
3.3 實驗原理………………………………………………………………………...20
第四章 材料介紹與實驗架構………………………………………………………21
4.1 材料介紹…………………………………………………………………………21
4.2 樣本製作………………………………………………………………………...22
4.3 實驗架構………………………………………………………………………...23
第五章 結果與討論…………………………………………………………………24
5.1 矽奈米粒子(R812)濃度對膽固醇液晶光柵影響………….24
5.2 2 wt% R812 d/p不同測試……………………………………………………….38
第六章 結論…………………………………………………………………………51
參考文獻……………………………………………………………………………..52
英文論文大綱(Extended Abstract)……………………………………………55

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