| The traditional aqueous and nonaqueous microemulsions have been received widespread applicationsin many fields. The major disadvantages of the conventional microemulsions are the relatively narrowliquid temperature range and using toxic volatile organic solvents. This significantly restricts theapplications of such microemulsions. The ionic liquid-based microemulsions shared the advantages of ionicliquids and microemulsions, and have potential applications in nanomaterial synthesis, chemical reactionand separation. As a part of the project supported by the National Natural Science Foundation of China (No.21003038), in this work, a series of functional ionic liquids were synthesized; some properties of themicroemulsion systems formed by these ionic liquids were studied. The main research content included thefollowing components.1. The quaternary phosphonium-based ionic liquids ([P6,6,6,14][Tf2N]), cholinium-based ionic liquids[N1,1,nEtOH][Tf2N](n=4,6,8,10,12,14,16), pyridinium-based ionic liquids ([Cnpy][Tf2N]) andimidazolium-based ionic liquids were synthesized, purified and characterized. Then the equilibriumproperties of the novel microemulsion solely composed of three different ionic liquids were studied. Theeffects of cationic type, alkyl chain length and temperature on the phase equilibrium were discussed indetail. The aggregation of ionic liquids surfactant in solvent ionic liquids was studied by surface tensionmethods, and the formation mechanism of this novel microemulsion was proposed. In addition, the particlesize and distribution of the micro-aggregates were characterized by dynamic light scattering technology andTEM.2. The magnetic cholinium-based ionic liquids [N1,1,nEtOH]FeCl4(n=4,6,8,10,12,14) and magneticimidazolium-based ionic liquids [Cnmim]FeCl4(n=2,4,6,8,10,12) were synthesized, purified andcharacterized. The non-aqueous microemulsion systems formed by these ionic liquids were researched inwhich ionic liquid were used as non-polar phase. The phase diagrams of these systems were drawn. Theeffect of the type of cation, alkyl chain length of cholinium-based ionic liquids and temperature wereinvestigated respectively. Finally, the sub-region of microemulsions was also characterized by conductivitymethods. 3. The different magnetic ionic liquids were synthesized including quaternary phosphonium-based ionicliquids,imidazolium-based ionic liquids and quaternary ammonium-based ionic liquids. The low criticalsolution temperature of these ionic liquids+H2O system was studied in detail. The phase diagrams of thesesystems were drawn. The impact of the type of cation and alkyl chain length of ionic liquids on the phasebehavior was discussed. Finally, the particle size and distribution of the system were also characterized bydynamic light scattering technology. |
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