十二烷基硫酸钠水溶液的动态表面吸附性质

doi:10.3866/PKU.WHXB201211214

Abstract

Abstract:

The dynamic surface adsorption properties of aqueous sodium dodecyl sulfate (SDS) solutions were investigated at different concentrations of NaCl using bubble pressure tensiometry MPTC. In the case of ionic surfactants, the existence of a diffuse electric double layer on the surface adsorption layer and around the micelle produces a surface charge. Here, we discuss the influence of the surface charge on the dynamic surface diffusion processes and the micelle properties. It was found that the SDS adsorption process occurred in the presence of a 5.5 kJ·mol^-1 adsorption barrier (E_a) that was generated by the surface charge; this barrier significantly decreased the effective diffusion coefficient (D_eff) of the dodecyl sulfate ions (DS^-). The ratio of the effective diffusion coefficient to the monomer self-diffusion coefficient (D) (D_eff/D) was only 0.013. This indicated that at the beginning, the adsorption of SDS followed the mixed kinetic-diffusion controlled model; this is different from the behavior observed for nonionic surfactants. The adsorption barrier was reduced when NaCl was added. E_a was less than 0.3 kJ·mol^-1 after the addition of 80 mmol·L^-1 of NaCl. This resulted in values of between 0.8 and 1.2 for D_eff/D, which was consistent with the diffusion-controlled model that describes the behavior of nonionic surfactants. The characteristic constants for the micelle dissociation rate (k₂) were determined from the dynamic surface tension of the SDS micelle solutions. The calculated k values decreased as the NaCl concentration was increased, which demonstrated the existence of surface charge on the SDS micelles; this surface charge increased the repulsive forces between the dodecyl sulfate ions, and promoted the dispersion of the micelles.

Key words: Sodium dodecyl sulfate, Dynamic surface tension, Surface charge, Adsorption barrier, Micelle dissociation

FAN Hai-Ming, ZHANG Yi-Nuo, ZHANG Jin, WANG Dong-Ying, GAO Jian-Bo, KANG Wan-Li, MENG Xiang-Can, ZHAO Jian, XU Hai. Dynamic Surface Adsorption Properties of Sodium Dodecyl Sulfate Aqueous Solution[J]. Acta Phys. -Chim. Sin. 2013, 29(02), 351-357. doi: 10.3866/PKU.WHXB201211214

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Dynamic Surface Adsorption Properties of Sodium Dodecyl Sulfate Aqueous Solution

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