Acta Chimica Sinica ›› 2010, Vol. 68 ›› Issue (17): 1771-1775. Previous Articles     Next Articles

Full Papers

无机盐对辛基酚聚氧乙烯醚乙基磺酸钠临界胶束浓度的影响研究

任朝华*,1,2,陈大钧2,罗跃1,黄璟3   

  1. (1长江大学化学与环境工程学院 荆州 434023)
    (2西南石油大学化学化工学院 成都 610050)
    (3长江大学工程技术学院 荆州 434023)
  • 收稿日期:2010-01-17 修回日期:2010-03-15 出版日期:2010-09-14 发布日期:2010-04-08
  • 通讯作者: 任朝华 E-mail:renzzzhuar@126.com

Investigation of Influence of Inorganic Salt on the Critical Micelle Concentration of Sodium Octylphenol Polyoxyethylenated Ethylsulfonate

Ren Zhaohua*,1,2 Chen Dajun2 Luo Yue1 Huang Jing3   

  1. (1 College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434023)
    (2 College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610050)
    (3 College of Technology and Engineering, Yangtze University, Jingzhou 434023)
  • Received:2010-01-17 Revised:2010-03-15 Online:2010-09-14 Published:2010-04-08
  • Contact: Ren ZhaoHua E-mail:renzzzhuar@126.com

At (25±0.2) ℃, the cmc values of nonionic-anionic surfactant sodium octylphenol polyoxyethylenated ethylsulfonate (OPS) in the aqueous solution in the presence of inorganic salt, LiCl, NaCl, KCl, MgCl2, CaCl2, BaCl2, AlCl3, FeCl3 and SmCl3, were measured by the method of surface tension. An influence on the cmc of nonionic-anionic surfactant OPS with inorganic salt counter ion was generalized from the variation of the cmc. It is indicated from the mathematic analysis of experimental data that although an additional hydrophilic group of nonionic oxyethylene unit was introduced in the molecular chain of nonionic-anionic surfactant OPS, the relationship between its cmc and the concentration of inorganic salt counter ion [M] is similar to that of ionic surfactant as the followed linear formula: lg cmc=-4.242-(0.2980-0.0102 Z/r)lg[M] ([M]<1 mol/L), where Z and r are the valence number and the average Van der Waals radius of atom of counter ion, respectively, then is characteristic of ionic surfactants and not of nonionic or amphoteric surfactants. It is obviously showed from the above formula that the cmc of nonionic-anionic surfactant OPS is related to the concentration, the valence number and the average Van der Waals radius of atom of counter ion, and the degree of binding to micelle of counter ion depends on the ratio of the valence number to the average Van der Waals radius of atom of counter ion. And the mechanism of the inorganic salt counter ion effect on the cmc of OPS is briefly analyzed.

Key words: nonionic-anionic surfactant, surface tension, critical micelle concentration, inorganic salt, counter ion, radius of atom, mechanism