高等学校化学学报

高等学校化学学报

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季铵盐型Gemini表面活性剂的胶束化动力学研究

李东华, 徐晓明, 周文婷, 韩国彬   

  1. 厦门大学化学系, 固体表面物理化学国家重点实验室, 厦门 361005
  • 收稿日期:2005-11-25 修回日期:1900-01-01 出版日期:2006-10-10 发布日期:2006-10-10
  • 通讯作者: 韩国彬

Kinetics of Micellization of Quaternary Ammonium Gemini Surfactants

LI Dong-Hua, XU Xiao-Ming, ZHOU Wen-Ting, HAN Guo-Bin   

  1. State Key Laboratory for Physical Chemistry of Solid Surface, Department of Chemistry, Xiamen University, Xiamen 361005, China
  • Received:2005-11-25 Revised:1900-01-01 Online:2006-10-10 Published:2006-10-10
  • Contact: HAN Guo-Bin

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被引次数

8

摘要： 采用停流法并结合Aniannson-Wall理论, 研究了联接基为(CH2)2, (CH2)3, (CH2)4和(CH2)6的季铵盐型Gemini表面活性剂胶束的形成-破坏过程. 动力学的研究结果表明, 胶束形成-破坏过程的弛豫时间(τ2)与联接基的长度、表面活性剂的浓度、反离子的浓度以及温度有关. 随联接基长度的增加, 季铵盐型Gemini表面活性剂胶束形成-破坏过程的弛豫时间缩短. 当温度高于293 K时, 随着反离子浓度的增加, 1/τ2将出现一个最低值. 根据核化焓结果提出了不同的联接基长度的季铵盐型Gemini表面活性剂具有不同的胶束形成-破坏过程的机理.

关键词: 季铵盐型Gemini表面活性剂, 停流法, 弛豫时间

Abstract: The stopped-flow technique combined with Aniannson-Wall theory was used to study the kinetics of micelle formation-breakup in aqueous solution of quaternary ammonium Gemini surfactant of the alkanediyl-α-ω-bis(dodecyldimethyl ammonium bromide) type with alkanediyl=(CH2)2, (CH2)3, (CH2)4 and (CH2)6. The kinetic results show that the relaxation time of micelle formation-breakup τ2 is dependent on the spacer chain length, the concentration of the surfactants, the concentration of antiionic and the temperature. The quaternary ammonium Gemini surfactants show a decrease in relaxation time of micelle formation-breakup, as the spacer chain length is increased. Above 293 K, the 1/τ2 comes to a minimum value when the concentration of anti-ionic is increased. The effect of nucleus formation enthalpy provides evidence in support of our proposed mechanism of the micelle formation-breakup for quaternary ammonium Gemini surfactant with different spacer chain lengths.

Key words: Quaternary ammonium Gemini surfactants, Stopped-flow method, Relaxation time

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