Critical Behavior of a Microemulsion with an Ionic Liquid
Critical Behavior of a Microemulsion with an Ionic Liquid
复制标题
DOI：
10.1021/je700559c
复制
发表时间：
2008-02
影响因子：
--
通讯作者：
H. Lü;X. An;W. Shen
中科院分区：
文献类型：
--
作者：
H. Lü;X. An;W. Shen
测量了不同[bmim][BF4]组成的{水+1-丁基-3-甲基咪唑鎓四氟硼酸盐([bmim][BF4])+二(2-乙基-1-己基)磺基琥珀酸钠(AOT)+癸烷}微乳液体系的临界浓度和临界温度。通过测定临界区恒压折射率，确定了水与AOT摩尔比为40.8、[bmim][BF4]质量分数为1.1·10−4的四元微乳液的共存曲线。临界指数β是从共存曲线中推导出来的。 β 的值非常接近临界区域的 3D-Ising 指数。结果发现，[bmim][BF4]的添加显着降低了下临界温度，这与{水+KCl+AOT+癸烷}体系相反，而临界组成几乎保持不变。这可能归因于离子液体的独特作用，它能够改变物理化学性质...
The critical concentrations and the critical temperatures for the microemulsion systems of {water + 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]) + sodium di(2-ethyl-1-hexyl)sulfosuccinate (AOT) + decane} with various compositions of [bmim][BF4] have been measured. The coexistence curves for the quaternary microemulsion with the molar ratio of water to AOT being 40.8 and the mass fraction of [bmim][BF4] being 1.1·10−4 have been determined by measuring the refractive index at constant pressure in the critical region. The critical exponent β has been deduced from the coexistence curves. The value of β is very close to the 3D-Ising exponent in the critical region. It was found that the addition of [bmim][BF4] significantly reduced the lower critical temperature, which was contrary to the {water + KCl + AOT + decane} system, while the critical composition was almost kept unchanged. It may be attributed to the unique role of the ionic liquid which is capable of modifying the physicochemical prope...