The Constructions Of Surfactant Forming Molecule Aggregation In Clean Media

The constructions of surfactant forming molecular aggregates (micelle, vesicle, microemulsion, liquid crystal etc.) in various media have been interesting in the field of Colloid and Interface Chemistry. With the formation and development of Green Chemistry, clean media (water, supercritical fluid, ionic liquid etc.) have been the important research part. Thereinto, the assembly of the surfactant forming molecular aggregates in those clean media is a challenging subject and it is significant theoretically and practically to obtain the detailed mechanism of many physico-chemical process and to exploit the novel space of creating the new matter and materials. Therefore, the main content in this paper is included in the following aspects:(1) Effect of compressed CO2 on ionic liquid solubilization in cyclohexane/TritonX-100/ethylammonium nitrate reverse micelle was investigated at different temperature and pressure by using phase behavior measurement and UV-Vis techniques. It was found that compressed CO2 could enhance considerably solubilization of the ethylammonium nitrate in the reverse micelles at suitable pressure, and formation of the reverse micelles could be tuned easily by pressure.(2) The effects of n-butanol as a cosurfactant on the phase behavior of cyclohexane/TX-100/[Bmim][BF4] system, especially on the [Bmim][BF4] solubilization capacity in [Bmim][BF4]/cyclohexane microemulsions, were investigated by direct visual observation, UV–vis spectrophotometry and dynamic light scatting (DLS) at 25.0 ?C. The results show that n-butanol magnifies notably the [Bmim][BF4]/cyclohexane microemulsion single-phase region and increases the [Bmim][BF4] solubilization capacity in [Bmim][BF4]/cyclohexane microemulsions. A possible mechanism was proposed to make out the effect of n-butanol as a cosurfactant on the microemulsions with ionic liquid domain.(3) The interfacial tension between dodecyldimethyl (3-sulfopropyl) -ammonium /sodium dodecyl sulfates mixed system in aqueous solution and n-hexadecane in the absence and in the presence of additives, i.e., polyacrylamide, sodium chloride and alkali have been measured with a spinning drop tensiometer. And the mixtures are found to exhibit ultralow interfacial tensions. The critical micelle concentrations were determined with drop volume technique. Utilizing the CMC data thermodynamics properties was determined. It was found that there existed ultralow interfacial tension between the mixed surfactant aquous and n-hexadecane; the micellization of the mixed system is a process drived by entropy.