臺灣博碩士論文加值系統

本研究是利用漸逝波腔體震盪吸收光譜法 (Evanescent Wave Cavity Ring-Down Spectroscopy) 來偵測矽石 (silica) 與液體溶劑界面的吸附現象。實驗原理主要是雷射光進入矽石材質的稜鏡，在內部表面如果發生全反射，則會在反射點透入一小段距離，這個微弱的
波就稱為漸逝波 (evanescent wave)。樣品通過稜鏡的反射面若能吸附在表面上，就會吸收漸逝波而造成雷射光在腔體內的震盪時間減少，由加入樣品前後的時間變化量就可以進而瞭解到界面的組成和樣品的吸附情形。實驗中使用的樣品主要為 trans-4-[4-(dibutylamino)-styryl]-1-methylpyridinium iodide (DMP＋I－) 和 trans-4-[4-(dibutylamino)styryl-1-3-sulfopropyl)pyridinium (DP)，使用的溶劑為乙腈 (CH3CN)。由電導測量可知在乙腈溶劑中，DMPI 會完全解離出 DMP＋ 陽離子和 I－ 陰離子，而 DP 則維持中性不解離。
矽石/液體溶劑界面的組成主要為矽醇基 (SiOH)，在溶液中會解離產生出帶負電的矽氧根 (SiO－) ，帶正電荷的樣品 (DMP+) 會和 SiO－ 產生正負相吸的靜電引力吸附在界面上，並且會受到其他陽離子的競爭；中性的樣品 (DP) 則主要是藉由氧原子和矽醇基上的氫
原子產生氫鍵，而吸附在界面上。
本研究順利的利用腔體震盪光譜法的技術，觀察到樣品吸附在界面上的情形，也可以明顯的看到加入其他有機分子造成的影響，並
利用蘭穆爾吸附模型求得樣品吸附的平衡常數和自由能的變化。

謝誌...........................................................................................Ⅰ
摘要...........................................................................................Ⅱ
目錄...........................................................................................Ⅳ
圖目錄.......................................................................................Ⅵ
表目錄.......................................................................................Ⅸ
第一章 序論...............................................................................1
第二章 腔體震盪吸收光譜法...................................................3
2.1 基本原理..............................................................................3
2.2 腔體震盪光譜法運用在凝態上..........................................6
2.3 漸逝波腔體震盪吸收光譜法............................................10
第三章 矽石/液體溶劑之界面................................................14
3.1 界面組成............................................................................14
3.2 界面性質............................................................................15
第四章 實驗內容.....................................................................19
4.1 實驗設置............................................................................19
4.2 樣品處理............................................................................25
4.3 實驗方法............................................................................26
第五章 結果與討論.................................................................31
5.1 系統測試過程....................................................................31
5.2 DP分子吸附在矽醇/乙腈界面上的情形........................40
5.3 DMP＋離子吸附在矽醇/乙腈界面上的情形...................44
5.4 加入三乙基胺的影響........................................................50
5.5 有機陽離子(CH3)4N＋Cl－的競爭吸附...............................57
5.6 實驗系統的比較................................................................68
第六章 結論和未來工作.........................................................70
6.1 結論....................................................................................70
6.2 未來工作............................................................................71
參考文獻...................................................................................72

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