碳量子点掺杂的蠕虫状胶束

doi:10.13218/j.cnki.csdc.2018.09.001

摘要/Abstract

摘要： 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(C₁₄DMAO)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C₁₄DMAO质子化为C₁₄DMAOH⁺,而C₁₄DMAOH⁺与C₁₄DMAO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C₁₄DMAO形成蠕虫状胶束。

关键词: 两性表面活性剂, 碳量子点, pH响应, 蠕虫状胶束

Abstract: 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 tetradecyldimethylamine 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.

Key words: zwitterionic surfactant, carbon quantum dot, pH-responsive, worm-like micelle

中图分类号:

TQ423.3

孙晓峰,李洪光. 碳量子点掺杂的蠕虫状胶束[J]. 日用化学工业, 2018, 48(9): 483-488.

SUN Xiao-feng,LI Hong-guang. Carbon quantum dot-doped worm-like micelles[J]. China Surfactant Detergent & Cosmetics, 2018, 48(9): 483-488.

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