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1-Hexanol triggered structural characterization of the worm-like micelle to vesicle transitions in cetyltrimethylammonium tosylate solutions

机译:1-六番醇触发蠕虫状胶束的结构表征在甲磺酸甲基铵溶液中的囊泡过渡

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The cationic surfactant cetyltrimethylammonium tosylate (CTAT) forms highly viscous/viscoelastic solutions and worm-like micelles at relatively low concentrations. The effect of 1-alkanols with short to long alkyl chains viz. ethanol, 1-butanol, 1-hexanol and 1-octanol on CTAT micelles was examined. In particular, a detailed study on the effect of 1-hexanol was carried out by viscosity, cryogenic transmission electron microscopy (cryo-TEM), nuclear magnetic resonance (NMR) and small-angle neutron scattering (SANS) to observe microstructural changes in CTAT micelles. 1-Hexanol displays a distinct interaction with CTAT micelles strongly dependent on CTAT concentration. Up to a certain critical CTAT concentration, 1-hexanol molecules penetrate into the micelles and show growth. Characterization by direct cryo-TEM imaging implies that upon progressive addition of 1-hexanol, worm-like CTAT micelles first grow and finally transform into vesicles. The course of vesicle formation was followed by SANS measurements. The site of 1-hexanol in the micelles close to the palisade layer was evaluated using 2D NMR. This study devotes a fundamental knowledge for controlling the shape and size of worm-like micelles that find many industrial applications particularly in personal- and home-care products.
机译:阳离子表面活性剂甲磺酸甲磺酸甲磺酸甲酯(CTAT)在相对低浓度下形成高粘性/粘弹性溶液和蠕虫状胶束。 1-链烷醇短到长烷基链的影响。检查CTAT胶束上的乙醇,1-丁醇,1-己醇和1-辛醇。特别地,对1-六番醇的影响的详细研究通过粘度,低温透射电子显微镜(Cryo-TEM),核磁共振(NMR)和小角度中子散射(SAN)来观察CTAT中的微观结构变化胶束。 1-六番醇显示与CTAT胶束强烈依赖于CTAT浓度的不同相互作用。直到一定的关键CTAT浓度,1-六醇分子渗透到胶束中并显示出生长。直接冷冻TEM成像的特征意味着在逐步加入1-六醇时,蠕虫状CTAT胶束首先生长并最终转化为囊泡。囊泡形成的过程随后是SANS测量。使用2D NMR评估靠近拨平板层的胶束中的1-六醇的位点。本研究专注于控制蠕虫状胶束的形状和大小的基本知识,这些胶束的形状和尺寸,特别是在个人和家庭护理产品中找到许多工业应用。

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