Singh Mohit, Tan Grace, Agarwal Vivek, Fritz Gerhard, Maskos Karol, Bose Arijit, John Vijay, McPherson Gary
Department of Chemical and Biomolecular Engineering, Tulane University, New Orleans, Louisiana 70118, USA.
Langmuir. 2004 Aug 31;20(18):7392-8. doi: 10.1021/la0493870.
Dry reverse micelles of AOT in isooctane spontaneously undergo a microstructural transition to an organogel upon the addition of a phenolic dopant, p-chlorophenol. This microstructural evolution has been studied through a combination of light scattering, small-angle neutron scattering (SANS), NMR, and rheology. Several equilibrium stages between the system of dry reverse micelles of AOT and a 1:1 AOT/p-chlorophenol (molar ratio) gel in isooctane have been examined. To achieve this, p-chlorophenol is added progressively to the dilute solutions of AOT in isooctane, and this concentration series is then analyzed. The dry micelles of AOT in isooctane do not undergo any detectable structural change up to a certain p-chlorophenol concentration. Upon a very small increment in the concentration of p-chlorophenol beyond this "threshold" concentration, large strandlike aggregates are observed which then evolve to the three-dimensional gel network.
在异辛烷中的AOT干反胶束在加入酚类掺杂剂对氯苯酚后会自发地发生微观结构转变，形成有机凝胶。这种微观结构演变已通过光散射、小角中子散射（SANS）、核磁共振（NMR）和流变学相结合的方法进行了研究。研究了异辛烷中AOT干反胶束体系与1:1的AOT/对氯苯酚（摩尔比）凝胶之间的几个平衡阶段。为实现这一点，将对氯苯酚逐步添加到异辛烷中的AOT稀溶液中，然后对该浓度系列进行分析。在异辛烷中的AOT干胶束在达到一定对氯苯酚浓度之前不会发生任何可检测到的结构变化。当对氯苯酚浓度超过这个“阈值”浓度有非常小的增量时，会观察到大量链状聚集体，然后它们会演变成三维凝胶网络。
