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化学学报
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化学学报 ›› 2001, Vol. 59 ›› Issue (12): 2122-2125. 上一篇    下一篇

研究论文

CTAB水溶液表面的吸附动力学

柴金玲;张高勇;李干佐;李英;徐桂英;马忠娟   

  1. 山东大学胶体与界面化学教育部重点实验室.济南(250100);中国日用化学工业 研究院
  • 发布日期:2001-12-15

Adsorption kinetics of cetyltrimethylammonium bromide at the air/water interface

Chai Jinling;Zhang Gaoyong;Li Ganzuo;Li Ying;Xu Guiying;Ma Zhongjuan   

  1. Shandong Univ., College of build mater and light ind, Dept of ma. Jinan(250100)
  • Published:2001-12-15

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874

被引次数

18 | 1

用最大气泡压力法测定了十六烷基三甲基溴化铵(CTAB)水溶液的动态表面张力，研究了CTAB水溶液表面吸附的动力学及其影响因素。结果表明，吸附过程由初始的扩散控制经混合控制过渡到势垒控制。扩散控制吸附速率快，时间短；势垒控制速率慢，时间长，吸附势垒一般为4～10kJ.mol^-^1。温度升高，动态表面张力减小，但吸附机理不变；无机盐或醇类的加入对势垒值影响不大，但对扩散控制步骤的影响较大。

关键词: 吸附, 动力学研究, 溴化十六烷基三甲铵, 表面张力

Maximum bubble pressure method (MBPM) was used to determine the dynamic surface tension of aqueous solution of cetyltrimethylamonium bromide (CTAB). Adsorption kinetics of CTAB at the air/water interface has been studied. Effects of temperature, concentration of CTAB, additives on the adsorption kinetics were also investigated. The results show that at beginning, the adsorption process is controlled by a diffusion step; whereeas toward the end, it changes to an activation mechanism with an adsorption barrier of between 4 and 10 kJ.mol^-^1. It seems that this burrier does not depend on the temperature and additives. Additives influence diffusion process significantly.

Key words: ADSORPTION, KINETIC STUDY, SURFACE TENSION

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