物理化学学报 >> 1998, Vol. 14 >> Issue (08): 709-714.doi: 10.3866/PKU.WHXB19980808

研究论文 上一篇    下一篇

起泡剂C12E8的表面流变学性质

韩国彬, Vignes-Adler M   

  1. 厦门大学化学系,厦门 361005|法国国家科研中心
  • 收稿日期:1997-11-04 修回日期:1998-02-16 发布日期:1998-08-15
  • 通讯作者: 韩国彬

Surface Rheological Properties of Foaming Agent C12E8

Han Guo-Bin, Vignes-Adler M   

  1. Department of Chemistry,Xiamen University,Xiamen 361005|CNRS,France
  • Received:1997-11-04 Revised:1998-02-16 Published:1998-08-15
  • Contact: Han Guo-Bin

摘要:

 利用表面波技术研究起泡剂C12E8的表面流变学性质以及解释表面变形所产生的表面张力梯度的修复机理.实验结果表明,起泡剂C12E8的表面具有粘弹性质,其减胀模量与表面变形频率有关系.在低浓度时,随着溶液浓度的增加,表面吸附量的增加很高了膨胀模量.而在高浓度时,由于表面与溶液之间的扩散交换抵消了膨胀模量的增加,这导致膨胀模量随着溶液浓度增加反而降低.

关键词: 表面波, 膨胀模量, 表面张力梯度, Marangoni效应

Abstract:

The gravity drainage of foam leads to the deformation of liquid film that results in the surface tension gradients and the heterogencity of film thicknesses. The deformation of liquid films causes the rupture of films. However, the deformation of liquid films produced from surface active agents solution can be spontaneously restored by the "Marangoni effect". This ability of restoration is connected with the surface rheology. The aim of this paper is to investigate the surface rheology of foaming agent C12E8 by the (lamped longitudinal waves method and explains the restoration mechanism of surface tension gradient due to the stretched surface. It is shown that the surface of foammg agent C12E8 is viscoclastic and that the surface dilational modulus depends on the frequency of the perturbation. The increase of dilational modulus with concentrations at lower concentration is caused by the surface adsorption of molecules C12E8, while the decrease at higher concentration is caused by bluk to surface diffusion exchange.

Key words: Surface waves, Dilational modulus, Surface tension gradient, Mrangoni effect