Micellization Parameters of Six Gemini Quaternary Ammonium Surfactants from Measurements of Conductivity and Surface Tension

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• 作者：Shanshan Zhang ; Jing Yu ; Jianzhou Wu ; Wei Tong ; Qunfang Lei ; Wenjun Fang
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2014
• 出版时间：September 11, 2014
• 年：2014
• 卷：59
• 期：9
• 页码：2891-2900
• 全文大小：495K
• ISSN：1520-5134

文摘

The micellization of six Gemini quaternary ammonium surfactants aqueous solutions has been investigated from measurements on specific conductivity as a function of surfactant concentration at different temperatures from (298.15 to 323.15) K. The micellization parameters such as the critical micellar concentration (CMC) and the degree of counterion dissociation (尾), Gibbs free energy (螖G_mic), enthalpy (螖H_mic), and entropy (螖S_mic) of micellization are then obtained. It is shown that the conductometry measurements provide agreement of the CMC values at 298.15 K with the surface tension studies. With the rise of temperature, the values of CMC and 尾 increase, while 螖G_mic changes little. The linear plots of T螖S_mic versus 螖H_mic show the effects of enthalpy鈥揺ntropy compensation. The length of alkyl chain and the spacer group of the Gemini surfactant have significant influences on micellization parameters.