本研究使用影像數位化懸掛氣泡測量儀，量測離子型與非離子型界劑水溶液於不同NaCl濃度下吸附至氣-液界面所造成的表面張力變化，再以質傳理論模式來探討其吸附動力學。本研究所探討之界面活性劑分別為陰離子型的正癸酸(C10 acid)、非離子型的正癸醇界面活性劑(C10OH)，與陽離子型的正十二烷基胺界面活性劑（DDA）。
本研究使用吸附等溫線（分別為非離子型Langmuir、離子型Langmuir、離子型Frumkin、非離子型Frumkin、離子型generalized Frumkin及非離子型generalized Frumkin模型）來模擬各界劑分子在不同NaCl濃度下之動態暨平衡表面張力。
若假設質傳機制為擴散控制，以ionic-gF模型模擬之結果最能描述正癸酸動態張力曲線；non-gF與ionic-gF模型皆能適切地模擬平衡張力曲線。
正癸醇於0 mM與100 mM NaCl濃度下，使用non-F與non-gF模型模擬所得到之擴散係數均接近Wilke-Chang equation計算所得之理論擴散係數(D= 5.70×10-6 cm2/s)。故我們推測在非離子界劑水溶液加入鹽類，對界劑吸附速率的影響可忽略不計。
陽離子型界劑DDA水溶液在溫度為25oC、濃度大於6.03×10-8 mol/cm3 時，在動態張力為43.9 mN/m處有一plateau區域；推論DDA單分子層在此張力下存在一液-氣界面相變化。另外，在長時間的動態張力量測實驗中，動態張力曲線會先降至一最低點，而後回升至一定值(~72mN/m)後不再變化；我們猜測DDA界劑分子在本體相的濃度隨吸附程序之進行會越來越低，可能是DDA分子吸附到固-液界面上。因此，本研究藉由蠕動幫浦不斷交換在鍍上疏水基模的石英盒中的實驗待測溶液，以維持水溶液中之本體相濃度，待固-液界面吸附達平衡後，再利用懸掛氣泡法來量測液-氣界面張力變化情形，以得到較準確的動態表面張力曲線。
添加50 mM NaCl之DDA水溶液在濃度小於1.31x10-8 mol/cm3時，混合控制之吸附速率常數為一定值，故我們合理的推測DDA於低濃度時其吸附程序為混合控制。

The dynamic/equilibrium surface tensions of three aqueous surfactant solutions (anionic surfactant 1-decanoic acid, nonionic surfactant 1-decanol, and cationic surfactant dodecylamine DDA) were measured by using a video-enhanced pendant bubble tensiometer. The theoretical ST profiles using the nonionic and ionic models (Langmuir, Frumkin and generalized Frumkin models) were compared with the experimental data of equilibrium and dynamic surface tensions in order to study the adsorption mechanism of these three surfactant molecules.
For 1-decanoic acid aqueous, a diffusivity of 5.50×10-6 cm2/s was obtained from the fit between the dynamic surface tension and the theoretical ST curves using ionic-gF model. The adsorption kinetics for 1-decanoic acid in aqueous 500 mM NaCl solution was found to be diffusion controlled with a diffusivity of 12.5×10-6 cm2/s.
For 1-decanol aqueous, a diffusivity of 6.60×10-6 cm2/s was obtained from the best-fit for aqueous solution without NaCl and a diffusivity of 6.14×10-6 cm2/s was obtained for aqueous solution without 100 mM NaCl.
There exists a plateau region at γ = 43.9 mN/m in the dynamic surface tension profiles of aqueous DDA solutions at 25oC. This plateau implies the existence of a phase transition for the DDA molecules adsorbed at air-water interface. A strange behavior was observed for DDA solution: γ(t) decreases from 72 mN/m (the surface tension of solvent) at t = 0, reaches a minimum γ, then increases with time and reach 72 mN/m. This special γ(t) relaxation implies that DDA molecules prefer to adsorb on solid surface instead of air-water interface. Therefore, two squirm pumps were used for exchanging DDA solution in the quartz cell before the ST measurement to maintain a constant bulk DDA concentration.

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