本研究利用懸掛氣泡影像數位化測量儀，測量陰離子型界劑Dioctyl Sodium Sulfosuccinate (AOT)水溶液於10 mM及500 mM NaCl濃度下的平衡暨動態表面張力。繼而以實驗所得的平衡及動態張力曲線與不同理論模式做最佳化比對，以探討AOT界劑水溶液之吸附動力學。
因一般離子型界劑分子之表面張力通常在一秒左右即達平衡值，極難取得離子型界劑分子在水溶液中之完整的動態表面張力。在本研究中，我們嘗試在AOT界劑水溶液中添加10 mM及500 mM NaCl以獲得較完整之動態表面張力曲線，並藉由懸掛氣泡影像數位化測量儀所量測到的平衡及動態表面張力，進而參考文獻上已知的吸附模型，以探討離子型界劑AOT之吸附動力學。
本研究使用吸附等溫線（分別為非離子型Langmuir 模式、離子型Langmuir 模式、離子型Frumkin模式及離子型generalized Frumkin模式）來模擬AOT界劑在10 mM及500 mM NaCl水溶液中之動態暨平衡表面張力。添加10 mM NaCl之AOT界劑水溶液，以ionic-gF模式最能描述平衡張力曲線，假設質傳機制為擴散控制模擬之結果與動態張力曲線相當吻合，所得之擴散係數幾乎為定值(3.55±0.6)×10-6 cm2/s且接近Wilke-Chang equation所估計的值(D= 4.63×10-6 cm2/s)，但Wilke-Chang equation計算所得的值是以純水為例進行估算而非NaCl水溶液，因此由Wilke-Chang equation計算所得的值應小於4.63×10-6 cm2/s，故合理推論其質傳機制為擴散控制。而添加500 mM NaCl之AOT界劑水溶液因缺少高張力數據導致無法藉由平衡張力模擬結果判斷何種模式最佳，假設質傳機制為擴散控制以ionic-gF模式模擬之結果最能描述動態張力曲線，於低濃度時模擬所得之擴散係數相當接近Wilke-Chang equation所估計的值，而濃度高於1.9×10-9 mol/cm3時擴散係數為(1.95±0.3)×10-6 cm2/s，低於Wilke-Chang equation所得的值，因此改以混合控制對高濃度部份進行模擬，其結果與動態張力曲線相當吻合但吸附速率常數並非維持定值，故懷疑我們並非使用正確的參數進行動態張力模擬因此難以決定其質傳機制。
最後以氣泡擴張實驗所得表面張力與相對濃度的關係來輔助確認最適化參數之準確性。以ionic-gF模式最為符合AOT界劑在10 mM NaCl水溶液中之實驗點，表示該模式於平衡張力曲線模擬得到的參數十分恰當；而各模式於AOT界劑在500 mM NaCl水溶液的實驗點模擬中皆存在偏差，推測是因為平衡張力曲線缺少高張力數據的關係，導致我們不容易尋找到最適化參數而無法適當描述擴張數據。

The dynamic surface tension (DST) for anionic surfactant AOT in aqueous NaCl solution (10 mM and 500 mM) onto a clean air-water interface was measured by using a video-enhanced pendant bubble tensionmeter. The dynamic surface tension and the equilibrium surface tension for aqueous AOT solutions with 10 and 500 mM NaCl onto a freshly created air-water interface was obtained. Then the comparison was made for the equilibrium surface tension data and the ionic model predictions. We assume that the mass transport was diffusion-controlled for AOT molecules in 10 and 500 mM NaCl solution. For AOT in aqueous 10 mM NaCl solution, the values of the diffusivity of AOT molecules were around (3.55±0.6)×10-6 cm2/s estimated from the ionic-gF fitting of dynamic surface tension profiles. Because the value from Wilke-Chang equation (D= 4.63×10-6 cm2/s) is not for NaCl solution but pure water as the solvent, the actual value should be lower than 4.63×10-6 cm2/s, so it is reasonable to state that the mass transport for AOT in aqueous 10 mM NaCl solution was diffusion-controlled. For AOT in aqueous 500 mM NaCl solution, the diffusivity values for lower AOT concentrations match the value from Wilke-Chang equation, and the diffusivity values are around (1.95±0.3)×10-6 cm2/s for the AOT concentrations larger than 1.9×10-9 mol/cm3. These diffusivity values are lower than the value from Wilke-Chang equation so we fit the dynamic surface tension data for AOT concentrations larger than 1.9×10-9 mol/cm3 by a mixed controlled ionic-gF model. The fittings are great but the values of adsorption rate constants are not the same. So we do not believe that the parameters from the equilibrium surface tension fitting are good enough to fit the dynamic surface tension curves due to the higher equilibrium surface tension data cannot be obtained from experiments. That is the difficulty for us to decide the mass transport mechanism in this study.

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