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化学学报
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化学学报 ›› 2006, Vol. 64 ›› Issue (20): 2051-2056. 上一篇    下一篇

研究论文

阳离子碳氟表面活性剂研究I: 水溶液中的胶束特性及生长

董姝丽, 李新, 徐桂英*   

  1. (山东大学胶体与界面化学教育部重点实验室 济南 250100)
  • 投稿日期:2006-02-14 修回日期:2006-04-20 发布日期:2006-10-28
  • 通讯作者: 徐桂英

Study on Cationic Fluorocarbon Surfactants I. Growth and Properties of Micelles in Aqueous Solution

DONG Shu-Li; LI Xin; XU Gui-Ying*   

  1. (Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan 250100)
  • Received:2006-02-14 Revised:2006-04-20 Published:2006-10-28
  • Contact: XU Gui-Ying

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利用动态光散射(Dynamic Light Scattering, DLS)、瞬态电双折射(Transient Electric Birefringence, TEB)和粘度测定方法研究了部分氟代阳离子表面活性剂氟代-2-羟基十一烷基二乙羟基甲基氯化铵(diethanolheptadecafluoro-2-undecanol methylammonium chloride, C8F17CH2CH(OH)CH2NCH3(C2H4OH)2Cl, DEFUMACl)水溶液的胶束化特性. 结果表明: DEFUMACl的临界胶束浓度cmc为3.8 mmol•L－1. 稀溶液中随着DEFUMACl浓度的增加或者无机盐NaCl的加入, DEFUMACl胶束由球形向棒状转变, 其转变浓度, 即第二临界胶束浓度(cmcII)为0.2 mol•L－1; 电导测定的反离子(Cl－)结合度为0.72. 利用球形和棒状胶束模型确定的DEFUMACl胶束聚集数分别为45和335.

关键词: 阳离子碳氟表面活性剂, 胶束, 盐效应, 动态光散射, 瞬态电双折射

The micellar properties such as critical micelle concentration (cmc), counterion binding, and the micellar growth of cationic fluorocarbon surfactant, diethanolheptadecafluoro-2-undecanol methylammonium chloride (DEFUMACl), were studied by dynamic light scattering (DLS), transient electric birefringence (TEB) and viscosity measurements. The micellar growth of DEFUMACl was induced by increasing DEFUMACl concentration and adding inorganic salt (NaCl). The cmc of DEFUMACl is 3.8 mmol•L－1. The results clearly showed that the spherical micelles were elongated to rod-like micelles by addition of salt in a dilute DEFUMACl solution or increasing DEFUMACl concentra-tion. The second critical micelle concentration (cmcII) was determined to be 0.2 mol•L－1 by conductivity measurements. The aggregation numbers of spherical and rod-like micelles were calculated to be 45 and 335, respectively.

Key words: cationic fluorocarbon surfactant, micelle, salt effect, dynamic light scattering, transient electric birefringence