物理化学学报 >> 1996, Vol. 12 >> Issue (04): 337-340.doi: 10.3866/PKU.WHXB19960410

研究论文 上一篇    下一篇

SDS和CTAB水溶中胶束扩散系数及第一、第二CMC测定

刘天晴,郭荣,沈明,于卫里   

  1. 扬州大学师范学院化学系，扬州 225002
  • 收稿日期:1995-08-03 修回日期:1995-12-04 发布日期:1996-04-15
  • 通讯作者: 郭荣

Determination of the Diffusion Coefficients of Micelle and the First CMC and Second CMC in SDS and CTAB Solution

Liu Tian-Qing,Guo Rong,Shen Ming,Yu Wei-Li   

  1. Department of Chemistry,Yangzhou University,Yangzhou 225002
  • Received:1995-08-03 Revised:1995-12-04 Published:1996-04-15
  • Contact: Guo Rong

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摘要：

在无探针条件下用循环伏安法测定了不同形状SDS和CTAB胶束的扩散系数，进而得到第一CMC和第二CMC（SDS：第一CMC和第二CMC分别为8．0×10－3和5．6×10－2mol•L-1;CTAB：第一CMC和第二CMC分别为8．9×10－4和2．1×10－2mol•L－1）．此法为表面活性剂体系物理化学性质的研究，特别是为第二CMC测定提供了一个新的研究方法．

关键词: 胶束, 第一CMC, 第二CMC, 循环伏安曲线, 扩散系数

Abstract:

A new electrochemical method is showed for study of physical chemisty character of surfactant systems, and particularly determination of second CMC. The diffusion coefficients of SDS and CATB micelles with different shapes are determined by cyclic voltammetry without any probe, and the first CMC and second CMC are obtained from the intersections of diffusion coefficients vs concentration curve (first CMC and second CMC are 8.0 ×10-3mol•L-1 and 5.6 ×10-2mol•L-1 for SDS, 8.9×10-4 and 2.1 ×10-2 mol•L-1 for CTAB)

Key words: Micelle, First CMC, Second CMC, Cyclic Voltammetry, Diffusion Coefficient