Ionic Liquids:the Self-assembly Medium For Surfactants

Ionic liquids have been widely used in colloid and interface science because of their unigue properties.Ionic liquids is not only used as solvent but also used as surfactants based on their tunable structure.The self-assembly behavior of ionic liquids surfactant in ionic liquids is of great interesting because of the nonvolatile and stable in high temperature.These systems can be used to design colloidal systems working at high temperature for chemical reaction and material synthesis.As part of the National Natural Science Fundation of China?No.21473050?,some functional ionic liquids were synthesized to designs the self-assembly systems composed of these ionic liquids.Their structure and properties of these systems were studied in this work.The main research contents include:1.The ionic liquids of ethanolamine nitrate?EOAN?,propanolamine nitrate?POAN?,ethanolamine formate?EOAF?and[C_npyrd]Br?n=10,12,14,16?were synthesized.The aggregation behavior of[C_npyrd]Br in EOAN,POAN and EOAF was studied by surface tension method.By calculating the aggregation parameters and thermodynamic parameters,the effects of alkyl chain length of[C_npyrd]Br,temperature and structure of solvent on the self-assembly behavior were analyzed.2.A microemulsion system consisting of three types ionic liquids,EOAN+[C_npyrd]Br?n=10,12,14,16?+[C_nmim]Tf₂N?n=2,10,12,14?/[C_nmim]BF₄?n=8,10?,was studied by phase equilibrium and dynamic light scattering.The effects of the alkyl chain length of the surfactant,solvent structure and temperature on the phase equilibrium properties and the size distribution of the microemulsion were studied.3.A new ionic liquid microemulsion was constructed,in which N-ethyl perfluorooctylsulfonamide?N-EtFOSA?was used as the surfactant,and 1-ethyl-3-methyl imidazole ethyl sulfate salt?[C₂mim]Et SO₄?was used as polar phase,and the quaternary phosphonium salt(P₄₄₄₁₄Tf₂N)was used as the non-polar phase.The aggregation behavior,phase equilibrium properties and the size distribution of the system were discussed by using surface tension method,phase equilibrium and dynamic light scattering.