Ionic Liquid Phase Diagram Microemulsion System Construct, Solubilization Way And The Nature Of The Research

The thesis contains four parts. Chapter I. Introduction. Chapter II. The effect of water on[bmim][AOT]/[bmim][BF4]/benzene ionic liquid microemulsions. Chapter III. The effect ofwater on [bmim][AOT]/[bmim][BF4]/cyclohexane ionic liquid microemulsions Chapter IV.Compositions and physicochemical properties of Tween type surfactants based microemulsions.Chapter I. IntroductionThe basic knowledges of both ionic liquid and microemulsion were introduced. Thesolubilization of microemulsions, the research methods of microemulsions and the researchprogress of microemulsions containing ionic liquid were discussed.Chapter II. The Effect of Water on [bmim][AOT]/[bmim][BF4]/benzene Ionic Liquid Microemulsions.The ionic liquid (IL)1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]) canform nonaqueous microemulsions with benzene by the aid of ionic surfactant1-butyl-3-methylimidazolium bis2-ethylhexyl sulfosuccinate ([bmim][AOT]). The effect ofsmall amounts of water on the [bmim][AOT] based [bmim][BF4]-in-benzene reversemicroemulsions was investigated. In contrast to the nonionic Triton X-100formed ILmicroemulsions, these aggregates have demonstrated features in common with traditionalaqueous systems, such as a normal microemulsion droplet size and decreased stability due tothe addition of polar component. The added water molecules gave two different effects on themicroemulsion structure: one is to decrease the headgroup area of [bmim][AOT], i.e. α value,this will decrease microemulsion size; the other is to swell the microemulsion droplets, which isknown to increase the microemulsion diameter. The size change of the microemulsion withwater depends on the loaded [bmim][BF4]:(1) when the [bmim][BF4] content is low, themicroemulsion diameter first decreases and then increases;(2) while the size remains about thesame for microemulsions with a moderate [bmim][BF4] loading;(3) a successive increase in size was found for high-loaded [bmim][BF4] microemulsions. In all cases, the added watermolecules are solubilized into the inner cores of the microemulsions. Moreover, the differenteffects due to the water addition on the [bmim][AOT] and nonionic Triton X-100based[bmim][BF4]-in-benzene microemulsions were further discussed.Chapter III. The Effect of Water on [bmim][AOT]/[bmim][BF4]/cyclohexane Ionic Liquid Microemulsions.The ionic liquid (IL)1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]) canform nonaqueous microemulsions with cyclohexane by the aid of ionic surfactant1-butyl-3-methylimidazolium bis2-ethylhexyl sulfosuccinate ([bmim][AOT]). The effect ofwater on [bmim][AOT]/[bmim][BF4]/cyclohexane ionic liquids icroemulsion was studied. Thephysicochemical properties of microemulsion characterization by Dynamic Light Scattering(DLS), UV-visible spectroscopy(UV-vis) and Nuclear Magnetic Resorance(NMR). All resultsshow that the added water was solubilized into the inner core of microemulsion. The size of themicroemulsion droplet was increased with increasing the water content, and the maximumsolubilized amount of [bmim][BF4] was decreased.Chapter IV. Compositions and Physicochemical Properties of Tween Type Surfactants based Microemulsions.The compositions and physicochemical properties of the microemulsion systemsconsisting of Tween type surfactant (Tween20, Tween60, Tween80)/butan-1-ol/dodecane/brine have been studied using ε-β fishlike phase diagram. From the ε-β fishlike phase diagram,solubility of the alcohol, composition of the interfacial layer, and solubilization ability of themicroemulsion systems have been studied. The solubilization parameters of the microemulsionsystems, SP*were in the order of magnitude Tween60> Tween80> Tween20. The effects ofdifferent salinities, oils, temperature and alcohols on the physicochemical properties andcompositions have been investigated. The solubilization ability of the microemulsion systemsincreases with increasing salinities or decreasing temperatures. The effects of alcohols and alkanes display opposite patterns of change. By increasing the carbon chain length of thealkanol molecules, or decreasing the carbon chain length of the alkane molecules, thesolubilization ability increases.