物理化学学报 >> 1999, Vol. 15 >> Issue (04): 327-332.doi: 10.3866/PKU.WHXB19990408

研究论文 上一篇    下一篇

起泡剂C12E8的表面动力学性质

韩国彬, 吴金添, Vignes-Adler M   

  1. 厦门大学化学系，固体表面物理化学国家重点实验室，物理化学研究所，厦门 361005|法国国家科研中心
  • 收稿日期:1998-07-27 修回日期:1998-10-22 发布日期:1999-04-15
  • 通讯作者: 韩国彬

Dynamic Surface Propertes of Foaming Agent C12E8

Han Guo-Bin, Wu Jin-Tian, Vignes-Adler M   

  1. State Key Laboratory for Physical Chemistry of Solid Surface,Institute of Physical Chemistry,Ximen University,Xiamen 361005|Center Natiomal de la Recherche Scientifuque,FRANCE
  • Received:1998-07-27 Revised:1998-10-22 Published:1999-04-15
  • Contact: Han Guo-Bin

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摘要：

利用表面波技术测定起泡剂C12E8的表面流变学性质以及通过对三种吸附模型（扩散是速率控制步骤，吸附-脱附是控制步骤和混合模型）的研究，揭示了C12E8溶液表面的吸附机理．认为在浓度小于cmc的范围内，C12E8分子的吸附和脱附是一个迅速的过程，而表面吸附速率是由分子从本体溶液到次表面层的迁移所控制．利用扩散是吸附速率控制步骤模型和Frulnkin状态方程研究了扩散系数、松弛特征频率、极限膨胀模量随C12E8浓度变化的规律，以及它们与表面张力梯度修复机理的关系．

关键词: 表面吸附模型, Frumkin状态方程, 扩散系数, 松弛特征频率, 极限膨胀模量

Abstract:

The dynamic surface dilational properties of C12E8 aqueous solution were investigated by the damped longitudinal wave method. The comparison between the experimental resultant and the three adsorption models (diffusion controlled, adsorption-desorption controlled and mixted model) shows that bellow the cmc the adsorption and desorption rate is rapid and the rate of adsorption is controlled by the diffusional exchange between bulk and subsurface with the diffusion coefficient which is dependent on the concentration at lower concentration and independent of concentration at higher concentration. The effects of the increase of the limiting dilational modulus at high frequency and the characteristic frequency of relaxation when the concentration of C12E8 increase has been related to the restoration mechanism of surface tension gradient due to the stretched surface.

Key words: Surface adsorption model, Frumkin state equation, Diffusion coefficient, Relaxation characteristic frequency, Limiting dilational modulus