Department of Chemistry, University of North Bengal, Darjeeling 734 013, India.
J Phys Chem B. 2009 Nov 26;113(47):15563-71. doi: 10.1021/jp907677x.
The effect of naphthols and methoxynaphthalenes on the microstructure transition of cetyltrimethylammonium bromide (CTAB) micelles is studied. Although the surface activities of these two types of organic dopants are strong, methoxynaphthalenes failed to promote spherical to worm-like micellar transition and to impart viscoelasticity to the aqueous CTAB solution, presumably due to their inability to form unique H-bonds with interfacial water. The micropolarity of OH sites of micelle-embedded naphthols is measured by observing the pK(a) shift at the micellar surface relative to bulk water. On the basis of spectroscopic and other data, the microstructures formed by both classes of dopants at the micellar surface are predicted. On the basis of hydroxyaromatic dopants, a simple and effective route to design pH-responsive viscoelastic worm-like micelles and the vesicles of single tail cationic surfactant (CTAB) is reported. Results are confirmed by observing cryogenic transmission electron microscopy (cryo-TEM) images.
研究了萘酚和甲氧基萘对十六烷基三甲基溴化铵（CTAB）胶束微结构转变的影响。尽管这两种类型的有机掺杂剂的表面活性都很强，但甲氧基萘未能促进球形到蠕虫状胶束转变，并赋予 CTAB 水溶液粘弹性，这可能是由于它们不能与界面水形成独特的氢键。通过观察胶束表面相对于本体水的 pK(a) 位移来测量嵌入胶束的萘酚中 OH 位的微极性。基于光谱和其他数据，预测了两类掺杂剂在胶束表面形成的微观结构。基于羟基芳烃掺杂剂，报道了一种设计 pH 响应性粘弹性蠕虫状胶束和单尾阳离子表面活性剂（CTAB）囊泡的简单有效的方法。通过观察低温透射电子显微镜（cryo-TEM）图像来证实结果。
