季膦盐离子液体对AOT/环己烷反相微乳液增溶水性质的影响

Effect of Quaternary Phosphine Ionic Liquid on Water Soluble Properties of AOT/cyclohexane Reverse Microemulsion

季膦盐离子液体由于其独特的物理化学性质而被广泛应用,由于其结构的多样化,目前还没有对其基本性质进行系统地研究。采用傅里叶变换红外光谱法(FT-IR)研究了AOT/环己烷中分别加入两种季膦盐离子液体P[4444]FeCl4和P[44414]FeCl4水溶液后所形成W/O型微乳液的性质,并与加入普通咪唑型离子液体[Bmim]Cl作对比。采用Peakfit分峰技术,将增溶水分为结合水、本体水和束缚水,并且用电位粒度仪测试了微乳液粒度的大小。经过对加入不同浓度的离子液体,微乳液水状态的变化进行比较,发现3种离子液体在微乳液中增溶的位置不同,按照[Bmim]Cl、P[4444]FeCl4、P[44414]FeCl4的顺序由微乳液的油水界面向栅栏层移动。由微乳液的粒径随浓度的变化关系,印证了离子液体在微乳液中增溶位置的正确性。通过研究两种季膦盐离子液体对于微乳液性质的影响,总结其作用规律,为新型离子液体的应用奠定基础。

Quaternary phosphine ionic liquids are widely used due to the unique physical and chemical properties.Based on the diversity of the structures,the basic properties have not been systematically studied.When adding two kinds of quaternary phosphine ionic liquids P[4444]FeCl4 and P[44414]FeCl4 aqueous solutions to the microemulsion,the properties of W/O microemulsions formed by AOT/cyclohexane have been investigated by Fourier transform infrared spectroscopy(FT-IR).The results were compared with the addition of common imidazolium ionic liquid[Bmim]Cl solution.There existed three states of water in the microemulsions,which were bound water,bulk-like water and trapped water,were obtained by a peakfit technology.The particle size of microemulsion was measured by potentiometric particle size analyzer.By comparing the changes of water state of microemulsion with different concentrations of ionic liquids,it was found that the solublesites of three ionic liquids in microemulsion were different.In the order of[Bmim]Cl,P[4444]FeCl4,P[44414]FeCl4,the solublesites of them moved from the oil-water boundary to the palisade layer of the microemulsion.Based on the relationship between the particle size of the microemulsion and the concentration,it was confirmed that the solublesites of the ionic liquid molecule in the microemulsion was correct.Based on the effects of two kinds of quaternary phosphine ionic liquids on the properties of microemulsions and summarizing the function rules,there are beneficial for the application of new ionic liquids.