论文标题
在多功能稳定系统中的胶束拥挤和分支
Micellar crowding and branching in a versatile catanionic system
论文作者
论文摘要
catanionic系统Didodecyldimethymonium溴化物（DDAB） - 牛陶酸钠氯乙酸钠（STDC）-D2O的特征是一个异常扩展的L1区域。溶剂的自扩散系数和嵌入胶束中的DDAB的比较提供了有关聚集体水合的信息。此外，将自扩散和14N NMR弛豫测量相关联，可以在具有0.2 DDABSTDC摩尔比的系统的拥挤溶液中的转化和旋转胶束运动中获得新的见解。 1H 2D NMR光谱给出了一些暗示DDAB和STDC在聚集体中的相互排列的提示。对于具有1.8和2.6 DDAB/STD摩尔比的样品，14N数据与存在某种分支，互连的胶束的存在一致。 23NA和81BR动态参数对周围环境特别敏感。人们发现，高度浓缩的分支胶束样品的特殊流变行为，即阶跃测试中的稳定振荡，是稳定性的一个例子，是由于固定壁上材料弹性和滑移的综合作用而引起的。
The catanionic system didodecyldimethylammonium bromide (DDAB)- sodium taurodeoxycholate (STDC)-D2O is characterized by an exceptionally extended L1 region. The comparison of self-diffusion coefficient of the solvent and the DDAB embedded in the micelles provided information about hydration of the aggregates. Moreover, correlating self-diffusion and 14N NMR relaxation measurements new insight could be obtained regarding the translational and rotational micellar motions in the crowded solutions of systems with 0.2 DDABSTDC molar ratio. 1H 2D NMR spectra gave some hints about the mutual arrangement of DDAB and STDC within the aggregates. For samples with 1.8 and 2.6 DDAB/STD molar ratios the 14N data were in agreement with the presence of somewhat branched, interconnected micelles. 23Na and 81Br dynamic parameters resulted particularly sensitive to the surrounding environment. The peculiar rheological behaviour of the, highly concentrated, branched micelles samples, namely the steady oscillations in the step tests, was found to be an example of instability originated by the combined effect of material elasticity and slippage at the fixed wall.
