摘要
在27℃下,利用圆环拉脱法测定了系列1-烷基-3-甲基咪唑四氟硼酸盐离子液体[Cnmim]BF4(n=6,8,10,12)、六氟磷酸盐离子液体[Cnmim]PF6(n=8,10,12)、碘盐离子液体[Cnmim]I(n=7,8,10)、氯盐离子液体[Cnmim]Cl(n=10,12,14)、烷基吡啶四氟硼酸盐离子液体[CnPy]BF4(n=9,11,13)的表面张力,测试结果表明,一定温度下离子液体的表面张力γ随着阳离子链长的增长而减小,随着阴离子尺寸的增大而增大。提出预测离子液体表面张力的经验方程,分析了温度对离子液体表面张力的影响,并进行了拟合分析。
Surface tensions were measured by using the pull-off method at 27℃. We got the data of the following ionic liquids： [Cn mim] BF4 （ 1- alkyl-3-methylimidazolium tetrafluoroborate）,[Cn mim] PF6 （ 1-alkyl-3-methylimidazolium hexfluorophosphate）, [Cn mim] I （ iodized salt ionic liquids）, [Cn mim] Cl（chloride）, [CnPy] BF4 （ alkylpyridinium tetrafluoroborate）. The results show that under certain temperature the surface tension of ionic liquids decreased with the growth of cation chain, and the surface tension of the ionic liquids increased of the size of the anion. Finally, the prediction empirical equation on ionic liquids surface tension was proposed, and then, the effect of temperature on the ionic liquids surface tension and the fitting analysis on ionic liquids with temperature was discussed.
基金
国家高技术研究发展计划(863计划)(2012AA040603)
重庆市教委项目(KJ110601)
关键词
离子液体
表面张力
拉脱法
经验方程
ionic liquid, surface tension, pull-off method, empirical equation
