Self-assemly System And Applied Research For Cationic Gemini Surfactant

Higher demand on surfactant is drew on account of the development of economy as well as the serious enviormental pollution. Conventional surfanctant could meet neither the needs of economy nor life, therefore, it is urgently to fabricate the new type of surfactant to promoted the application for the field of surfactant. Gemini surfactant, which has received considerable attention, encompasses two hydrophobic chains and two hydrophilic head groups connetected with a spacer, and the extraordinary properties make them useful in wide fileds. The self-assembly system of cationic gemini surfactant and anion has been widely used in chemincal, pharmaceutical, textile, photography and oil-field development. In this work, the self-assembly properties, aggregation behaviors of cationic gemini surfactant and anion were investigated. The main content of this paper was listed as following:In chapter 1, the properties of gemini surfactant were introduced, the self-assembly system of cationic gemini surfactant and development in research were summaried in recent years. Then, different analytical methods for the structure of the self-assembly system were disscused. The research ideas were proposed and the framework of this paper was constructed.In chapter 2, the effect of anions on the visicosities and critical micelle concentrations of N,N-bis(hexadecyl dimethyl)-1,3-dichloride-propyldiyl ammonium salt (referred to as 16-3-16) were explored. Sodium salicylicum (referred to as NaSal) and sodium p-toluenesulfonate (reffered to as TsONa) were chosen to be conterions by the visicosities and critical micelle concentrations. Furthermore, the effect of pH and the composition ratios were discussed, and the micelle morphologies of the system were characterized by scanning electron microscopy(SEM).In chapter 3, the system of cationic gemini surfactant and NaSal was studied by fluorescence spectrometry and resonance light scattering spectrometry. The values of binding constants(KB) and gibbs free energy(△G) of gemini surfactant—Nasal were measured by fluorescence spectrometry. In addition, the curve of resonance light scattering intensities with the concentrations of gemini surfactants could be used to predicting aggregation behaviors of the system.In chapter 4, the second-order scattering spectrum, resonance light scattering spectrum and absorption spectrum between 16-3-16 and sunset yellow were investigated. The influencing factors, such as pH, the stability as well as the amount of sunset yellow were examined. Moreover, the values of binding constants(KB) and gibbs free energy(AG) of 16-3-16—sunset yellow were measured by ultraviolet-visible spectrometry. The second-order scattering intensities and resonance light scattering intensities were proportional to the concentrations of 16-3-16 in a certain range. Based on these, the new simple and rapid methods have been proposed to determine 16-3-16.