| The room temperature ionic liquid (room temperature ionic liquids, RTILs) as a new kind of green solvent, have received extensive attention in many areas. Exploring the application of RTILs in more areas is becoming a hot research topic. The study of chemical nature of the interface and the formation of ordered aggregation of the new type ionic liquid will further help to improve the nature of tradional molecular organized assemblies and to expand the kinds of tradional molecular organized assemblies. At the same time, the study will also expand the applications of RTILs. This research includes the followings:1. The synthesis and physicochemical properties of ionic liquid surfactant CnmimBrThree kinds of midazole-based ionic liquids bromo-1-alkyl-3-methylimidazolium (CnmimBr) surfactants were synthesized by one-pot, whose structures were characterized by IR and 1HNMR. C8mimBr was liquid at room temperature, and the melting points of C12mimBr and C16mimBr were 48.5 oC and 68.2 oC separately. CnmimBr also has good surface activity, the critical micelle concentration (cmc) were 20.0, 8.0, 0.70 mmol/L separately; each of whose molecule occupied the average area (Amin) reduced as the length of hydrophobic chain, while the saturated adsorption capacity (Γmax) increased when they were adsorbed on the surface. Change in the enthalpy and entropy caused the formation of C8mimBr micelles, while the micelles of C8mimBr were very loose, which resulted in the fluorescence quenching of pyrene. The formation of compact micelles of C12mimBr and C16mimBr could solubilize pyrene molecules. To form a good interface elastic membrane, the concentration of C8mimBr solution was higher than the cmc value, while the concentrations of both C12mimBr and C16mimBr were lower than the cmc values. 2. The compounding properties of CnmimBr and SDS mixed systemsThe mixtures of CnmimBr and in SDS dilute solution were studied through electrical conductivity measurements, turbidity method, pyrene emission spectra, dynamic surface tension measurements. There were CnmimBr/SDS vesicles, the size of C12mimBr/SDS vesicle was the biggest. The surface tension of C8mimBr/SDS and C12mimBr/SDS mixed system was easy to reach equilibrium, while the C16mimBr/SDS mixed system needed to take a long time to reach equilibrium. The addition of CnmimBr to SDS/H2O system resulted much lower shear capacity, whose storage modulus and loss modulus were an order of magnitude lower.3. The interaction betweenα-tocopherol and the C16mimBr/SDS mixed systemThe interactions betweenα-tocopherol and different ordered aggregations by electrical conductivity measurements, surface tension measurements, fluorescence emission spectra, pyrene probe method, isothermal titration calorimetry measurement, and 1HNMR. The solubilization ofα-tocopherol in C16mimBr and SDS micelles made the cmc value of former increase and had no effect on the cmc value of the later. C16mimBr could result in the fluorescence quenching ofα-tocopherol, while the fluorescence intensity ofα-tocopherol solubilizied in SDS micelles increased. As for the C16mimBr/SDS mixed system,α-tocopherol involved in the formation of C16mimBr/SDS vesicle, which made the fluorescence intensity ofα-tocopherol decrease; as the concentration of SDS increased, the mixed system could well protect the fluorescence emission process ofα-tocopherol. |
