A cyclic voltammetric technique for the detection of micro-regions of bmimPF6/Tween 20/H2O microemulsions and their performance characterization by UV-Vis spectroscopy
A cyclic voltammetric technique for the detection of micro-regions of bmimPF6/Tween 20/H2O microemulsions and their performance characterization by UV-Vis spectroscopy
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DOI：
10.1039/b510902g
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发表时间：
2006-01-01
期刊：
影响因子：
9.8
通讯作者：
Li, GZ
中科院分区：
文献类型：
--
作者：
Gao, Y;Li, N;Li, GZ
离子液体作为绿色溶剂，可以替代传统的有机溶剂，与水形成有用的微乳液。研究了IL，1-丁基-3-甲基咪唑六氟磷酸盐(bmiPF(6))、非离子表面活性剂吐温20和水组成的微乳液，考察了三元体系的相行为。以亚铁氰化钾K4Fe(CN)(6)为电活性探针，用循环伏安法确定了微乳液的三个区域：水在bmiPF(6)(W/IL)、双连续和bmiPF(6)在水中(IL[W)。以甲基橙为探针，用紫外-可见光谱研究了微乳液环境的极性。使用离子化合物K3Fe(CN)(6)进行紫外-可见光谱测量表明，bmiPF(6)/Tween20/H2O微乳液能够将盐物种增溶到微乳液液滴中。此外，紫外-可见光谱还显示了核黄素在微乳中的增溶作用。这些结果表明，这些基于IL的微乳液在金属纳米材料的生产、生物提取或作为酶反应的溶剂方面具有潜力。
As green solvents, ionic liquids (ILs) can be substitutes for traditional organic solvents, and form useful microemulsions with water. Microemulsions consisting of the IL, 1-butyl-3-methylimidazoliurn hexafluorophosphate (bmimPF(6)), the non-ionic surfactant Tween 20 and water were formed at 30.0 degrees C, and the phase behavior of the ternary system was investigated. Three regions of the microemulsions: water-in-bmimPF(6) (W/IL), bicontinuous, and bmimPF(6)-inwater (IL[W) were identified by cyclic voltammetry using potassium ferrocyanide K4Fe(CN)(6) as an electroactive probe. The polarity of the microemulsion environment was investigated by UV-Visible spectroscopy using methyl orange as a probe. Use of the ionic compound K3Fe(CN)(6) in UV-Visible measurements revealed that the bmimPF(6)/Tween 20/H2O microemulsions could solubilize salt species into the microemulsion droplets. Moreover, the solubilization of riboflavin in the microemulsions was also shown by UV-Visible spectra. These results show that these IL-based microemulsions have potential in the production of metal nanomaterials, in biological extractions or as solvents for enzymatic reactions.