本研究使用影像數位化懸掛氣泡測量儀，量測離子型界劑於水溶液中吸附至氣-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陽離子型的正十二胺陽離子型界面活性劑（DDA），與陰離子型的磺基丁二酸鈉二辛酯（AOT）。
因一般小分子離子型界劑分子之動態表面張力通常在一秒前即達平衡值，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。本研究嘗試在AOT界劑水溶液中添加500 mM NaCl，以期可經實驗量測而獲得較完整之動態表面張力曲線，並進一步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，來探討離子型界劑AOT之吸附動力學。
陽離子型界劑DDA水溶液在溫度為25oC、濃度大於6.01×10-8 mol/cm3 時，在動態張力為43.7 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。
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，所得擴散係數為(1.55±0.3)×10-6 cm2/s。
本研究之第二部份選用polycarbonate (PC)平板，以不同mesh號數的砂紙研磨，來製備具不同表面粗糙度的PC平板。繼而觀察純水固著液滴於PC平板上，在固定濕度狀況下之蒸發過程，來探討固著純水液滴在不同粗糙度之PC平板上，接觸角之動態變化情形，並進一步探討表面粗糙度對於後退接觸角的影響。另亦探討文獻中提到的strongly pinning之揮發過程中，其固著液滴是否有後退接觸角。

The dynamic and equilibrium surface tensions for the adsorption of anionic surfactant AOT and cationic surfactant DDA in aqueous solutions onto a clean air-water interface was measured by using a video-enhanced pendant bubble tensionmeter. A comparison between the nonionic and ionic models (Langmuir, Frumkin and generalized Frumkin models) and the equilibrium and dynamic surface tensions of AOT and DDA were performed in order to study the adsorption mechanism and to determine the diffusivity of surfactant molecules. The adsoprion kinetics for AOT in aqueous 500 mM NaCl solution was found to be diffusion controlled with a diffusivity of (1.55±0.3)×10-6 cm2/s.
A plateau region was observed at dynamic surface tension profile of DDA aqueous solution at γ = 43.7 mN/m at 25oC. The existence of a plateau implied the existence of a liquid expanded and liquid condensed phase transition for the DDA molecules adsorbed at air-water interface.
In the second part of this study, polycarbonate (PC) substrates with various surface roughness were used on the investigation of the evaporation process in a circumstance of fixed humidity. Relaxation of contact angle was monitored and the pinning phenomenon was studied. The definition of receding contact angle was also discussed at the end of this work.

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