物理化学学报 >> 2016, Vol. 32 >> Issue (5): 1227-1235.doi: 10.3866/PKU.WHXB201602223

研究论文 上一篇    下一篇

咪唑基表面活性离子液体在气/液界面的扩张粘弹性

李燕,柴金岭*()   

  • 收稿日期:2015-12-07 发布日期:2016-05-07
  • 通讯作者: 柴金岭 E-mail:jlchai@sdnu.edu.cn
  • 基金资助:
    国家自然科学基金(21306092);国家自然科学基金(21476133);山东省高校科技计划(J12LA02)

Dilational Viscoelasticity of Imidazole-Based Surface Active Ionic Liquids at the Air/Water Interface

Yan LI,Jin-Ling CHAI*()   

  • Received:2015-12-07 Published:2016-05-07
  • Contact: Jin-Ling CHAI E-mail:jlchai@sdnu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21306092);the National Natural Science Foundation of China(21476133);Science and Technology Plan Project of Shandong Provincial University, China(J12LA02)

摘要:

合成了两种咪唑基表面活性离子液体,通过界面膨胀流变法研究了其在气/液界面的聚集行为,考察了咪唑基表面活性离子液体浓度、无机盐和温度对聚集行为的影响。研究发现,咪唑基表面活性离子液体在吸附过程中吸附控制占主导作用,而弛豫过程不是单一指数函数;加入无机盐或升高温度可以提高咪唑基表面活性离子液体的表面活性、增强其在界面的吸附能力、降低表面张力。扩张流变结果显示扩张模量、弹性模量和粘性模量随震荡频率增加而增加;随表面活性离子液体浓度增大,扩张模量先增大后减小。扩张模量随温度升高或无机盐(NaBr或CaBr2)的加入而降低。表面活性离子液在气/液界面形成的吸附膜以弹性模量为主,而且C14mimBr的界面膜弹性模量大于C12mimBr的界面膜弹性模量。

关键词: 吸附动力学, 扩张模量, 气/液界面, 咪唑基表面活性离子液体

Abstract:

Two imidazole-based surface active ionic liquids (CnmimBr) were synthesized, and their aggregation behavior at the air/water interface was studied via an oscillating bubble method. The effects of the CnmimBr concentration, inorganic salts (NaBr and CaBr2), and temperature on the aggregation behavior were investigated. The results of the adsorption dynamics showed that the adsorption-controlled process dominated, but the relaxation process was not purely mono-exponential. The addition of inorganic salt or increase in temperature improved the surface activity of the CnmimBr and lowered the dynamic surface tension. The dilational rheological results revealed that the dilational modulus, elastic modules, and viscous modules increased with increasing oscillating frequencies, and the modulus reached a maximum value with increasing CnmimBr concentration. Increasing the temperature or adding inorganic salts (NaBr or CaBr2) decreased the dilational modulus. The elastic modulus was dominant for the CnmimBr layer, and the elastic modulus of C14mimBr was larger than that of C12mimBr.

Key words: Adsorption dynamics, Dilational modulus, Air/water interface, Imidazole-based surface active ionic liquid

MSC2000: 

  • O647