表面活性剂在气/液界面上的吸附动力学

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。

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	刘俊吉
	王创业
	徐凌

关键词：表面活性剂吸附气/液界面动态表面张力

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 C_(12)E_7 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.

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Received 2005-01-15; published 2005-01-15

引用本文:

刘俊吉,王创业,徐凌.表面活性剂在气/液界面上的吸附动力学[J]. 化学工业与工程, 2005,22(1): 4-7

LIU Jun-ji, WANG Chuang-ye, XU Ling.Adsorption Kinetics of Surfactant at Air/Solution Interface[J]. Chemcial Industry and Engineering, 2005,22(1): 4-7

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