查詢結果分析
相關文獻
- Phase Transition Phenomena of the Adsorbed 1-dodecanol Monolayer at the Air-water Interface
- 相變化光碟材料系統簡介
- 相變化光碟材料系統簡介
- 飛行光學讀寫頭於表面入射型相變化碟片之近場記錄
- 淺談相變化光碟
- 如何正確評估散熱片之散熱能力
- A Study on the Collapse Mechanism of Stearic Acid Monolayer at Air/Water Interface
- 高倍速與高密度相變化光碟材料開發與研究
- 相變化光碟材料之檢測與分析
- Ge-Te-Sb合金粉體燒結之最適化製程研究
頁籤選單縮合
題 名 | Phase Transition Phenomena of the Adsorbed 1-dodecanol Monolayer at the Air-water Interface=正十二烷醇吸附單分子膜於液氣界面之相變化現象 |
---|---|
作 者 | 吳秉杰; 蔡瑞瑩; 林析右; | 書刊名 | Journal of the Chinese Institute of Chemical Engineers |
卷 期 | 38:5/6 2007.09-11[民96.09-11] |
頁 次 | 頁443-450 |
分類號 | 460.02 |
關鍵詞 | 正十二烷醇; 單分子膜; 液氣界面; 相變化; Phase transition; 1-dodecanol; Surface pressure; Surface concentration; Ellipsometry; |
語 文 | 英文(English) |
中文摘要 | 本研究偵測正十二烷醇於20℃之動態張力曲線γ(t),且佐以橢圓儀量測其等溫吸附曲線以掌握該吸附單分子膜於液/氣界而之相變化現象。表面濃度等溫吸附曲線呈現三個急遽上升區域,分別為溶液濃度 C=1.3×10^(-9),2×10^(-9)及3.7×10^(-9)mol/mL。其中第一及三個相轉變濃度為二維系統典型之一階相轉變。此二相轉變發生濃度與先前張力研究結果一致,分別代表吸附分子由氣相轉至液體擴張相(G-LE)及由液體擴張相轉至液體凝縮相(LE-LC)之相轉變濃度。發生於 C=2×10^(-9)mol/mL之第二個相轉變則從未曾由於先前之動態張力研究中被確認。根據此第二個相轉變發生前後吸附膜厚之顯著差異判斷,此單分子膜於液體擴張相中應發生了吸附方位之改變。本研究分別以LEh及LEv來分別代表此液體擴張相中之“平躺”和“站立”吸附狀態,此種相變化行為在γ(t)曲線中以出現轉折點,而非典型之定值張力區形表現。由於張力值在此吸附狀態,此種相變化行為在γ(t)曲線中以出現轉折點,而非曲型之定值張力區形式表現。由於張力值在此相轉變過程中不斷變化,研究中所新定義之LEh及LEv,轉變可能並非典型之一階相變化。 |
英文摘要 | Phase transition phenomenon of the 1-dodecanol monolayer at the air/water interface was studied by the dynamic γ(t) curves and the adsorption isotherm obtained by ellipsometry at 20℃. The surface-concentration adsorption isotherm elearly showed three abrupt increases at bulk concentration C of 1.3×10^(-9)and 3.7×10^(-9) mol/mL, respectively. The 1st and the 3rd transitions observed herein, that were typical 2D first-order transitions, were consistent with the gas to liquid expanded (G-LE) and the liquid expanded to liquid condensed (LE-LC)phase transitions observed in a previous tensiometry study. The 2nd transition that occurred at C=2×10^(-9) mol/mL was not identified from any previous dynamic surface-tension profiles. Judging from the substantial increase in the film thickness of the transition, it was believed that the orientation change of the adsorbed molecule was involved in the Le phase, ALEh and a LEv phase, that denoted the "lie-down" and "stand-up" types of adsorption, respectively, was used to describe this transition and a cusp, instead of a constant surface-tension region, was observed in the dynamic γ(t) curves for this transition. This suggested that, since the surface tension varied during the transition process, the newly identified LEh and LEv transition might not be the typical first-order type of phase transition. |
本系統中英文摘要資訊取自各篇刊載內容。