Thermodynamic Properties, Structure And Influencing Factors Of IL / O Microemulsion System

This thesis contains four parts: Chapter I. Introduction. Chapter II. The interfacialcomposition and the structure parameters of the IL/O (W/O) microemulsions formedby Gemini surfactant or imidazolium ionic liquid type surfactant. Chapter III. Thecomparision of the effects of the alcohol, oil, the mass ratios of water to surfactantof IL/O microemulsion and W/O microemulsion. Chapter IV. The comparision ofthe effect of temperature on the IL/O microemulsion and W/O microemulsion.Chapter I.IntroductionThe research progess of ionic liquids and microemulsions in recent years wasintroduced.The research progress of microemulsions containing ionic liquid wasemphatically discussed.Chapter Ⅱ. The interfacial composition and the structureparameters of the IL/O (or W/O) microemulsions formed byGemini surfactant or imidazolium ionic liquid type surfactant.The composition and structural parameters of IL/O microemulsions containing(Bim)2-2Br (CnmimBr)/alcohol/alkane/[Bmim][BF4], and W/O microemulsionscontaining (Bim)2-2Br (CnmimBr)/alcohol/alkane/H2O, were studied and compared.1) Compared with the W/O microemulsions containing CnmimBr (n=12,13,14), asmall amount of molecules are incorporated into the interfacial layer for the IL/Omicroemulsions. This results in the standard free energy change (G oo i) values forIL/O microemulsions. The radius of the water pool (Rw) for the W/O microemulsionsystems are greater than that of the IL/O systems.2) Compared with the W/O microemulsions containing Cn(Bim)2-2Br (n=12,13,14), the most amount of the alcohol were incorporated into the oil phase of[Bmim][BF4]-based microemulsions. This results in the standard free energy change() values for [Bmim][BF4] based microemulsion systems. The radius of thewater pool (Rw) for the W/O microemulion systems were greater than the IL/O microemulsion systems. With the increase in the surfactant chain length, theX iaandX oavalues decrease.3) Compared with the CnmimBr based microemulsions, Cn(Bim)2-2Br-basedmicroemulsions need more cosurfactant to balance the interfacial layer.Chapter Ⅲ. The effects of the alcohol, oil and the mass ratio ofwater to surfactant of IL/O microemulsionsThe effects of the alcohol, oil and the mass ratio of water to surfactant on thecomposition and structural parameters of IL/O microemulsions were studied.1) As the mass ratios of water to surfactant (ω) increases, the most amount of thealcohol was needed for the balance of the interfacial layer, values would decrease.2) With the increase in the alkane carbon chain, the ability of the alkane topenetrate the interfacial layer deceases. It seems that the most amount of the alcoholwas needed for the interfacial layer.Chapter Ⅳ. The effect of temperature on the thermodynamicand structural parameters of IL/O (or W/O) microemulsionsystems.The effect of temperature on the thermodynamic and structural parameters of IL/Omicroemulsion systems and W/O microemulsion systems.1) With the increase in temperatures, the values of and Rwincrease, but thevalue of and Goo idecreases.2) With the increase in temperatures, the values of increase. The values ofdecrease. Whereas, would increases for both microemulsion systems.3) With the increase in temperatures, the IL/O microemulsions was more stable,while the W/O microemulsion was less stable. The radii of the IL/O and W/Omicroemulsion droplets decrease as well.