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Drug induced micelle-to-vesicle transition in aqueous solutions of cationic surfactants

机译：阳离子表面活性剂水溶液中药物诱导的胶束-囊泡转变

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The effects of the anti-inflammatory drug diclofenac sodium (DS) on the morphology of aqueous micellar aggregates of two ionic liquid-based surfactants (ILBSs), 1-hexadecyl-3-vinylimidazolium bromide, C16VnImBr, 1-hexadecyl-3-methylimidazolium bromide C16MeImBr, and (conventional) cetyltrimethylammonium bromide, C16Me3ABr (Vn, Im, Me, A = vinyl, imidazolium, methyl and ammonium, respectively) were studied at 25 °C. To probe the morphology changes of the formed aggregates, we employed turbidity, viscosity, dynamic light scattering, and transmission electron microscopy. Depending on [DS], the transitions observed were from spherical micelles → worm-like micelles → vesicles. Viscosity data indicated that the first transition occurred at lower [DS] for C16VnImBr compared to C16MeImBr and C16Me3ABr; indicating stronger interaction between (C16VnIm)+ and DS?. Light scattering results revealed that the DS/C16VnImBr system contained larger vesicles, as compared to DS/C16MeImBr and DS/C16Me3ABr. The changes in morphology agree with the expected effects of DS on the packing parameter of the colloidal aggregates.
机译：抗炎药双氯芬酸钠（DS）对两种离子液体基表面活性剂（ILBSs）溴化1-十六烷基-3-乙烯基咪唑鎓，C 16 的胶束聚集体形态的影响sub> VnImBr，1-十六烷基-3-甲基咪唑鎓溴化物C 16 MeImBr和（常规）十六烷基三甲基溴化铵，C 16 <在25°C下研究了/ sub> Me 3 ABr（分别为Vn，Im，Me，A =乙烯基，咪唑鎓，甲基和铵）。为了探测形成的聚集体的形态变化，我们采用了浊度，粘度，动态光散射和透射电子显微镜。取决于[DS]，观察到的转变是从球形胶束→蠕虫状胶束→囊泡。粘度数据表明，与C 16 MeImBr相比，C 16 VnImBr的第一转变发生在较低的[DS]和C 16 Me 3 ABr;表明（C 16 VnIm） + 与DS ？ 。光散射结果表明，与DS / C 16 16 VnImBr系统包含较大的囊泡。 > MeImBr和DS / C 16 Me 3 ABr。形态的变化与DS对胶体聚集体的堆积参数的预期效果相符。

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