【摘要】 在求解扩散方程的基础上,推导出了描述气 液界面吸附的动态吸附量Γ(t)表达式,并重点讨论了吸附的初始阶段和最终阶段两种极限情况。试验测定了25℃下表面活性剂C12E7[分子式CH3(CH2)11(OCH2CH2)7OH]水溶液的平衡及动态表面张力,结合理论推导,考察了C12E7在气 液界面的吸附过程。试验结果表明,气 液界面吸附过程在最初(极短时间)阶段是扩散控制,在吸附过程的后期(长时间)则出现了扩散 吸附混合控制。更多还原

【Abstract】 The diffusion equation was solved and the dynamic surface adsorption Γ（t）,which was always used to describe the adsorption at air/solution interfaces,was derived.Two cases of adsorption,i.e. the short time limit and the long time limit,were mainly discussed.As an example,surfactant C₁₂E₇ was chosen and the equilibria and the dynamic surface tensions of its aqueous solution at 25 ℃ were measured.It was proved that for the short time limit the whole process was controlled only by diffusion,however,within the long time range a mixed diffusion-adsorption controlled process appeared.更多还原