Ionic Liquids And N-butyric Acid On The Microemulsion Phase Behavior And The Influence Of The Solubilization Capacity

This thesis contains four parts. Chapter I. Introduction. Chapter II. The phasebehavior of CnmimBr and butyric acid based microemulsions. Chapter III. The phasebehavior and synergetic solubilization of microemulsion systems containingC₁₂mimBr-SDS mixture. Chapter IV. The phase behavior and solubilization ofCn（Bim）₂-2Br/butyric acid based microemulsion systems.Chapterâ… . IntroductionIonic liquid microemulsion systems containing an ionic liquid with short carbonchain as the polar or non-polar phase, or containing an ionic liquid with long carbonchain as the surfactant were introduced. The research progress of the ionic liquidmicroemulsions was reviewed. The role of cosurfactants in microemulsion systemsand the related research progress were also discussed.Chapter â…¡. The phase behavior of CnmimBr and butyric acid basedmicroemulsionThe phase behavior of microemulsion systems of CnmimBr（n=12,14,16）/butyricacid/hexane/brine was studied with ε-β fishlike phase diagram method.The solubility （εB） of butyric acid in the microemulsion systems is higher thanthat of butan-1-ol. The mass fraction of butan-1-ol in the interfacial layer （AS） issmaller than that of butyric acid. The solubilization ability of the microemulsionsystems containing butyric acid was larger than that of the systems containingbutan-1-ol.HCl concentration and NaCl concentration have the similar effects on thephysical-chemical parameters of the microemulsions. That is, εBand ASdecrease asHCl or NaCl concentration increases. However, NaOH concentration has the oppositeeffect on above parameters, compared with HCl or NaCl.With the increase in the carbon chain length of oleic molecules, εBand ASincrease，the solubilization ability decreases. With increasing temperature, the solubilization of the microemulsion systemsincreases.Chapter â…¢. The phase behavior and synergetic solubilization ofmicroemulsion systems with C₁₂mimBr-SDS mixed surfactant andbutyric acidThe phase behavior and synergetic effect of microemulsion systemsC₁₂mimBr-SDS/butyric acid/hexane/brine have been studied. The effects of salts, oilsand temperature on the ε-β phase diagram of C₁₂mimBr-SDS （=1:9）/butyric acid/oil/brine microemulsion systems were also investigated.With inceasing the carbon chain length of alkanes, the solubility and the massfraction of butyric acid increase, the solubilization of the systems decreases.The effects of different inorganic salts on the solubilization ability of the systemsare in the order NaCl>KCl> CsCl. Cations have larger influence on the solubilizationability than anions.With increasing salinities the solubility and the mass fraction of butyric aciddecreases, while the solubilization of the systems increases.Chapter â…£. The phase behavior and solubilization of Gemini/butyricacid based microemulsionThe phase behavior and solubilization of CnmimBr or Cn（Bim）₂-2Br/butyricacid/hexane/brine microemulsion systems were studied and compared. The solubilityand the mass fraction of butyric acid decrease and the solubilization of themicroemulsion systems increases with the increase in the carbon chain length of thesurfactant.The solubilization ability of Gemini surfactant systems is larger than that of themonomer surfactant systems. The solubility and the mass fraction of butyric acid aresmaller than the monomer systems.With increasing salinities, the solubility and the mass fraction of butyric aciddecrease, while the solubilization of the systems increases. With the increase in the carbon chain length of the oil molecules, the solubility and the mass fraction ofbutyric acid increase, the solubilization ability decreases. The solubilization ability ofC₁₄（Bim）₂-2Br/butyric acid/hexane/brine（5%NaCl） microemulsion systems increaseswith the increase in temperatures.