Diffusion-controlled Adsorption Kinetics of Surfactant at Air/Solution Interface

doi:10.1016/S1004-9541(13)60562-5

Abstract

Abstract: For the diffusion-controlled adsorption, the expression of dynamic surface adsorption Γ(t)was obtained by solving the diffusion equation. Two cases, i.e. the short and long time limits, were mainly discussed in this paper. From the measured dynamic surface tension of aqueous surfactant sodium dodecyl sulfate (SDS) solutions at 25℃, the adsorption kinetics of SDS at air/solution interface was studied. It was proved that for both of the short and long time limits, the adsorption process of SDS was controlled by diffusion.

Key words: adsorption, air/solution interface, dynamic surface tension

摘要： For the diffusion-controlled adsorption, the expression of dynamic surface adsorption Γ(t)was obtained by solving the diffusion equation. Two cases, i.e. the short and long time limits, were mainly discussed in this paper. From the measured dynamic surface tension of aqueous surfactant sodium dodecyl sulfate (SDS) solutions at 25℃, the adsorption kinetics of SDS at air/solution interface was studied. It was proved that for both of the short and long time limits, the adsorption process of SDS was controlled by diffusion.

关键词: adsorption, air/solution interface, dynamic surface tension

LIU Junji, XU Yun, SUN Hongxiu. Diffusion-controlled Adsorption Kinetics of Surfactant at Air/Solution Interface[J]. Chin.J.Chem.Eng., 2013, 21(9): 953-958.

刘俊吉, 徐芸, 孙红秀. Diffusion-controlled Adsorption Kinetics of Surfactant at Air/Solution Interface[J]. Chinese Journal of Chemical Engineering, 2013, 21(9): 953-958.

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