本研究探討正十二胺陽離子型界面活性劑（以下簡稱DDA）在氣-液界面及固-液界面的吸附行為。利用懸掛氣泡數位影像測量儀及表面張力計來量測DDA的動態暨平衡表面張力，並進而探討DDA的吸附行為。
動態表面張力數據顯示，DDA水溶液在溫度為25oC，在張力為43.7 mN/m 有一plateau區域，推論可能是相變化的行為。在長時間的量測中，動態張力曲線先降至一最低點，而後回升至72 mN/m。我們猜測DDA界劑分子在水溶液本體相的濃度變得越來越低，推論是DDA界劑分子傾向吸附在石英表面。本研究藉由加入鋼珠或玻璃珠於水溶液中，並量測平衡張力的變化來計算DDA分子在鋼珠及玻璃珠的表面吸附量。
另外，將DDA溶於乙二醇（以下簡稱EG）中，量測其動態表面張力及平衡表面張力，並比較其溶於水中與溶於EG中的不同。繼而使用Phase transition 理論模式來模擬描述其吸附動力學。
本文之第三部份探討正壬醇的吸附動力學。輔以不同的吸附模式來模擬正壬醇的動態暨平衡表面張力。模擬結果顯示generalized-Frumkin模式最能描述其吸附行為。
最後，本文探討聚氧乙烯系非離子型界劑CiEj以不同比例相互混合時，其動態表面張力之變化情形。藉由動態表面張力的實驗數據可獲知，在此混合界劑系統中，不論在哪種情況下，動態表面張力受表面張力較低的一方影響較大。

This study investigates the adsorption kinetics of cationic surfactant 1-dodecylamine (DDA) and 1-nonanol. We measured the dynamic and equilibrium surface tension by using the pendant bubble tensiometer and surface tensiometer (CVBP-A3), then discussed the relaxations of surface tension different surfactant concentrations.
There exists a plateau at surface tension γ = 43.7 mN/m in the dynamic surface profiles of aqueous DDA solutions at 25oC. This plateau phenomenon implies the existence of a phase transition for the DDA molecules adsorbed at air-water interface. Another novel phenomenon was also observed that γ(t) decreases from 72 mN/m (the surface tension of solvent) once the air-water interface been generated, reaches a minimum γ, then γ(t) increases with time. At the end of the adsorption process, γ(t) always comes back to 72 mN/m. This γ(t) data implies that the DDA molecules preferred to adsorbed on quartz surface instead of air-water interface, even DDA does adsorb on air-water surface. To clarify this point, we added a lot of glass or stainless steel beads in aqueous DDA solutions and measured their equilibrium surface tensions. The surface concentrations for DDA adsorbed on glass and stainless steel surface were then evaluated from the change of equilibrium based on the mass balance calculation.
At the end of this study, DDA molecules were also dissolved in ethyl glycol (EG), and the dynamic and equilibrium surface tensions were measured to investigate the adsorption kinetics of DDA in EG.

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