物理化学学报 >> 1998, Vol. 14 >> Issue (11): 1025-1029.doi: 10.3866/PKU.WHXB19981112

研究简报 上一篇    下一篇

十一烯酸钠与十一酸钠水溶液的表面化学

朱王步瑶, 吴立军, 黄建滨, 何煦   

  1. 北京大学化学学院,北京 100871
  • 收稿日期:1997-12-08 修回日期:1998-02-16 发布日期:1998-11-15
  • 通讯作者: 朱王步瑶

Surface Chemical lnvestigation on Aqueous Solution of Sodeum Undecanoate and Sodium Undecenoate

Zhu Bu-Yao, Wu Li-Jun, Huang Jian-Bin, He Xu   

  1. Chemistry College,Peking University,Beijing 100871
  • Received:1997-12-08 Revised:1998-02-16 Published:1998-11-15
  • Contact: Zhu Bu-Yao

关键词: 十一烯酸钠, 十一酸钠, 表面活性, 吸附热力学参数, 胶团微极性

Abstract:

The CMCs, γcmcS and micropolarities of aqueous solutions of sodium undecenoate(UNDE) and sodium undecanoate (UNDA) have been studied by surface tension measurement and fluorescence method. It is revealed that double bond at the en of hydrophobic chain weakens its hydrophobicity, hence lowering the effectiveness of micelle formation and that of surface tension reduction. The limited adsorption amount is less, while micropolarity higher, in UNDE solution than those in UNDA's. Therefore, conformation of the hydrophobic chain in aggregates is infered to be more bending for UNDE. Changes of thermodynamic parameters in micellization and adsorption show smaller free energy reduction and larger increases in entropy and enthalpy for UNDE than those for UNDA.

Key words: Sodium undecenoate, Sodium undecanoate, Surface activity, Thermodynamic parameters, Micropolarity