碳量子点掺杂的蠕虫状胶束

以富勒烯生产过程中的副产物炭灰为原料,利用酸回流法制备了表面含有羧基的碳量子点(CQDs)。将所制备的CQDs代替传统有机酸,发现其与十四烷基二甲基氧化胺(C_(14)DMAO)在水溶液中能形成蠕虫状胶束。考察了CQDs质量浓度、pH等对蠕虫状胶束流变性质的影响。结果表明,CQDs质量浓度的增加和溶液pH值的降低均有利于蠕虫状胶束的形成。利用低温透射电镜可以原位地观察到蠕虫状胶束和CQDs的存在。CQDs外围-COOH解离出的H~+可以使C_(14)DMAO质子化为C_(14)DMAOH~+,而C_(14)DMAOH~+与C_(14)DMAO之间形成的氢键是蠕虫状胶束形成的主要驱动力。以上结果表明,CQDs可以有效地诱导C_(14)DMAO形成蠕虫状胶束。

Carbon quantum dot-doped worm-like micelles

Carbon quantum dots (CQDs) with carboxyl groups were prepared by acid reflux method and using fullerene carbon soot as raw material. CQDs can form worm-like micelles with tetradecyl dimethylamine oxide (C14DMAO) in aqueous solution when the CQDs replaced the traditional organic acid. The effects of CQDs mass concentration and pH on the rheological properties of worm-like micelles were investigated. It is found that both a higher mass concentration of CQDs and a lower pH will facilitate the formation of worm-like micelles. The worm-like micelles and CQDs can be observed in situ by cryo-TEM. The dissociation of H+ from CQDs could protonate C14DMAO into C14DMAOH+. The hydrogen bond formed between C14DMAOH+ and C14DMAO is the main driving force for the formation of worm-like micelles. The results above show that CQDs can effectively induce C14DMAO to form worm-like micelles.