Ionic Liquid Surfactant C < Sub > N < / Sub > Mimbr/c < Sub > 12 < / Sub > Eo < Sub > N < / Sub > / H < Sub > 2 < / Sub > O System Phase Behavior Characteristics And Structure

Recently, exploring the application of ionic liquids surfactant in molecular organized assemblies is becoming a hot research topic, especially midazole-based ionic liquids sufactant in micelles、microemulsion and lyotropic liquid crystals. The study of formation ordered aggregation and chemical nature of the interface of ionic liquids surfactant will further help to improve the nature of tradional molecular organized assemblies and to expand the kinds of tradional molecular organized assemblies. The main results are as follows:1.Three kinds of midazole-based ionic liquids sufactant-bromo-1-dodecyl-3-methylimidazolium (C12mimBr)、bromo-1-tetradecyl-3-methylimidazolium (C14mimBr) and bromo-1-hexadecyl-3-methylimidazolium (C16mimBr) are synthesized. The phase behavior of CnmimBr/CnEO4/H2O system is shown by the phase diagrams. The micro-structures of the aggregates are studied by the methods of rheometer, polarized optical microscopy (POM) and Small-Angle X-ray Diffraction (SAXD). The viscoelastic properties of the systems has been studied with increasing alkyl chain length of ionic liquids surfactant.2.In the micelle region of C16mimBr/C12EO4/H2O system, fix C16mimBr/C12EO4(w/w)=65/35with changing H2O%(by weight) and H2O=80%(by weight) with different weight ratios of C16mimBr/C12EO4, the effect of viscoelastic properties are studied by the methods of rheometer and freeze-fractured transmission electron microscopy (FF-TEM). The interaction between C16mimBr and C12EO4is confirmed by1HNMR experiments. The influence of temperature and different salts to the syetems also has been studied.3.Change the length of EO, fix C16mimBr/C12EO3=75/25with changing H2O%(by weight) and H2O=80%(by weight) with different weight ratios of C16mimBr/C12EO3(w/w), the micelle region of C16mimBr/C12EO3/HzO system is studied by the methods of rheometer, the micelles shape can be confirmed by freeze-fracture transmission electron microscopy (FF-TEM) images. The influence of temperature and ethanol, pentanol, heptanol, decyl alcohol on the viscoelastic properties of C16mimBr/C12EO3/H2O system has been studied.