Amphiphilic Molecules In The Ionic Liquid And Orderly Combination Of Structure And Application Of Research

1. The Aggregation Bahavior of Triblock Copolymers Micelle in Ionic LiquidIn this chapter, rheological methods were used to study the aggregation behavior of solutions formed by two kinds of triblock copolymers, P123 and F127 in the ionic liquid [Bmim] PF6. The results showed that they both belonged to pseudoplastic fluid, The two systems would have a shear-thinning phenomenon above a certain triblock copolymer concentration because of polymer chains'tangle.At the same concentration, F127/ [Bmim] PF6 solution have shear-thinning phenomenon relative earlier to P123/[Bmim] PF6 solution. We also found that with temperature increasing, the shear-thinning phenomenon of F127 / [Bmim] PF6 solution became obvious, but the P123/[Bmim] PF6 solution has almost the opposite trend. When the temperature was higher than about 30 oC, the viscosity shear-thinning point advanced with increasing temperature, especially when the temperature was higher than 45 oC, not only shear-thinning phenomenon more clearly, even a sharp increase in viscosity, Dynamic rheological behavior of studies showed that, with increasing concentration of block copolymer, the elasticity modulus G' and viscosity modulus G" of F127 and P123 / [Bmim] PF6 solution both increased with increasing frequency, and with temperature increasing, G' and G" of F127/[Bmim] PF6 solution both declined, but because of the desolventizer effect, P123/[Bmim] PF6 solution's G' and G" performed first decline then upword trend with temperature increasing.2. The Structure and the Character of [Bmim]PF6/Tween 85/p-xylene MicroemulsionIn this chapter, we chose a noionic surfactant Tween 85, ionic liquid [Bmim]PF6, p-xylene to constitute a new microemulsion system. We determined the O/IL, bicontinuous and IL/O microemulsion phase diagram by electrical conductivity measurement. FITR, 1H NMR, UV, and dynamic light scattering methods were used to study the formation of microemulsion and the interaction within the three components. The results showed that, after adding [Bmim]PF6 into the reverse micelle solution formed by Tween 85 and p-xylene, the positively charged imidazole ring would combine to the negatively charged O atoms on Tween 85's OE chains, Thus would weak the original hydrogen bonds in and between the Tween 85 molecules, the interaction would grow when the molar ratio of ionic liquid to surfactant R increase. Dynamic light scattering results showed that the hydrodynamic radius Rh of the microemulsion also increases with R value.3. Microstructure of Lamellar Liquid Crystal in Tween 85/[Bmim]PF6/ H2O System and Applications in Ag Nanoparticle Synthesis and Lu- brication.Lamellar liquid crystal (Lα) was formed by room temperature ionic liquid [Bmim]PF6, non-ionic surfactant Tween 85 and H2O. Ag nanoparticles were prepared in the lamellar phase of Tween 85/[Bmim]PF6/H2O system and rheological techniques were employed to study the viscosity and elasticity of Lαphase and Lα/Ag nanoparticle mixed system, the lubrication properties were also investigated by high-speed ring-block wear tester. The results showed that the structure strength, anti-wear capacity and lubrication properties of the Lαphase were enhanced with increasing amount of Tween 85, but were impaired with increasing amount of H2O. Increasing amount of [Bmim] PF6 could also make the structural strength weaker, but the lubrication properties of the system were improved because of the inherent lubrication properties of ionic liquid. The particle size of Ag synthesized in the Lαphase was about 3-10 nm with relatively uniform dispersion, and the presence of the Ag nanoparticles in lamellar phase could also enhance the structure strength, anti-wear capacity and lubrication properties.4. Interaction Between Ionic liquid and Bovine Serum Albumin (BSA)In this chapter, we used UV - visible spectroscopy, fluorescence, synchronous fluorescence spectroscopy, circular dichroism spectroscopy, negative staining - transmission electron microscopy, ITC methods to study the interaction between bovine serum albumin and ionic liquid. The results showed that, the addition of [Bmim]Cl would make the UV absorption intensity of BSA increased and also lead to fluorescence quenching; Synchronous fluorescence results suggested that [Bmim]Cl molecules mainly interact with the region which close to the tryptophan residues of BSA, so that made the hydrophobic structure changed; negative staining - transmission electron microscopy directly showed the change of protein structure after adding ionic liquid; From circular dichroism results we found that ionic liquid also produced a much stronger impact toα-helix,β-fold of BSA, which led to changes in protein secondary structure. Finally, ITC and surface tension methods were used to analyse the interaction between them.