Ionic Liquid As Surfactant, The Formation Of The Microemulsion Phase Behavior Study

This thesis was composed of four chapters. Chapter I,Introduction. Chapter II, Studies on the phase behavior and solubilization of the microemulsion systems formed by anionic surfactants with theε^βfishlike phase diagrams. Chapter III, Phase behavior of the microemulsions prepared from surfactant-like ionic liquids by Winsor type phase diagram method. Chapter IV, Phase behavior of the microemulsion systems containing alkyl polyglucoside and cetyltrimethyl ammonium bromide.Chapter I. IntroductionThe basic knowledge of ionic liquids (ILs) and microemulsions were introduced. The research progress of imidazolium ILs in formation of molecular organized assemblies was reviewed.Chapter II. Studies on the phase behavior of the microemulsion formed by surfactant-like ionic liquids [C_nmim] BrThe phase behavior and the solubilization of the quaternary microemulsion system surfactant-like ionic liquid/alcohol/alkane/brine were studied withε-β-fish-like phase diagram.1. With the increase in the aliphatic chain length of the surfactant-like ionic liquids, the minimum content of alcohol to form the middle phase microemulsion and the solubilization ability increase.2. With the increase in the branched chains of the alcohol molecules, the solubilization ability decreases. 3. The increase in the concentration of the inorganic salt could enhance obviously the solubilization power of the microemulsion.4. With the increase in the carbon chain length of the oil molecules, the solubilization ability decrease.5. The phase diagrams and the solubilization ability of the microemulsions formed by the three different surfactants C₁₆mimBr, CTAB and CPB] were compared, and a little difference in solubilization ability was found.Chapter III. Phase behavior of microemulsions prepared from surfactant-like ionic liquids by Winsor type phase diagram methodThe phase behavior and the influencing factors of middle phase microemulsions prepared from surfactant-like ionic liquid 1-alkyl-3-methylimidazolium bromide (C₁₂mimBr, C14mimBr and C₁₆mimBr) were studied systematically with Winsor-type phase diagrams.1. With the increase in the carbon chain length of CnmimBr molecules, the minimum content of alcohol to form the middle phase microemulsion and the alcohol width decrease, the solubilization ability increases.2. With the increase of CnmimBr content,the minimum content of alcohol to form the middle phase microemulsion and the alcohol width increases at first and then decreases ,the solubilization ability increase;3. With the increase in the carbon chain length of the alcohol, the carbon chain length of the oil decreases and an increase in NaCl content, the minimum alcohol content and the alcohol width would decrease, but but the solubilization ability increases. Chapter IV. Phase behavior of the microemulsion systems Containing alkyl polyglucoside and cetyltrimethyl ammonium bromideThe phase behavior and the solubilization ability of the microemulsion systems containing mixed surfactants of alkylpolyglucoside (APG) and cetyltrimethyl ammonium bromide (CTAB) were studied using theε^βfishlike phase diagram method.1. Two surfactants are mainly incorporated into the interfacial layer, and the solubilities of the two surfactants in the aqueous or oleic phase can be ignored. Alcohol dissolves in the aqueous or oleic phase, besides their entering into the interfacial layer.2. The synergism was existed in the solubilization of the microemulsion systems between the two surfactants.3. The solubilization ability (SP*) of the microemulsion systems increaseses as the carbon chain length of the alkane molecules decreases. The increase in the NaCl content notably deacreases the solubility of the alcohol, but the solubilization ability of the microemulsion system changes little.