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題 名 | Effect of Methylation on the Gas Sensing Properties of β-Cyclodextrins=甲基化對β-環糊精氣體感測性質之影響 |
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作 者 | 劉進興; 許聖秋; | 書刊名 | Journal of the Chinese Institute of Chemical Engineers |
卷 期 | 34:6 2003.11[民92.11] |
頁 次 | 頁675-681 |
分類號 | 463.37 |
關鍵詞 | 甲基化; β-環糊精; 氣體感測; Cyclodextrin; Gas sensor; QCM; Molecular modeling; |
語 文 | 英文(English) |
中文摘要 | 本研究探討甲基化對β-環糊精氣體感測性質之影響,以石英晶體微天平法測量並比較三種β-環糊精(未甲基化的β-CyD、部分甲基化的DM-β-CyD、全甲基化的TM-β-CyD)對醇類及笨類分子之摩爾吸附度,並以雙重吸附模式分析吸附作用之本質。實驗發現:在笨類的吸附方面,由於分子大學影響孔穴之包絡作用,因此β-CyDs對間二甲苯之包絡小於甲苯及苯。但孔穴外由於凡得瓦耳作用的非特定吸附之趨勢正好相反,且隨著β-環糊精之甲基化而更重要。因此摩爾吸附度Acv在β-CyD為苯<甲苯<二甲苯,在DM-β-CyD為三者持值,在TM-β-CyD則由苯至甲苯至二甲苯依序略升。而在醇類的吸附方面,β-CyD對甲醇之包絡作用大於乙醇,乙醇又大於正丙醇,即與醇類生成氫鍵的能力相關;但甲基化降低了氫鍵的生成機會,因此對DM-β-CyD及TM-β-CyD而言,上述遞減效應減弱;甲基化同時也增強凡得瓦耳作用力,使得孔穴外非特定吸附之貢獻增加,因此摩爾吸附度在β-CyD為甲醇>乙醇>正丙醇,在DM-β-CyD三為三者持平,而在TM-β-CyD則由甲醇至乙醇至正丙醇依序略升。這些結果顯示,β-環糊精之氣體靈敏度與選擇性取決於各種作用力之競爭與平衡。 |
英文摘要 | The effect of methylation on gas sensing properties ofβ-Cyclodextrins was studied with the piezoelectric quartz crystal microbalance technique. Molar adsorptivities of threeβ-Cyclodextrins (un-methylated, partially methylated, and fully methylated) towards alcohols and benzene derivatives were measured and compared, and a two-step sorption model was used to elucidate the nature of interactions betweenβ-Cyclodextrins and the organic vapor molecules. For the un-methylatedβ-Cyclodextrin, the inclusion of alcohols is the greatest for methanol, followed by ethanol and n-propanol, in parallel with the hydrogen bonding acidity of the alcohol. Methylation reduces the hydrogen bonding and the magnitude of tude of the acidity effect. Methylation also increases the van der Waal’s force, which exerts a reverse effect and makes Acv slightly increasing from methanol to n-propanol. For benzene derivatives, the inclusion is the least for m-xylene, followed by toluene and benzene for the un-methylatedβ-Cyclodextrin, due to the molecular size effect. However, the van der Waal’s force exerts a reverse trend, and becomes more important with methylation of theβ-Cyclodextrin. The balance between various interactions plays an important role in the sensitivity and the selectivity ofβ-Cyclodextrin sensors. |
本系統中英文摘要資訊取自各篇刊載內容。