Self-assembly of anionic pyrene derivatives with cationic surfactants bearing a tetradecyl chain
Self-assembly of anionic pyrene derivatives with cationic surfactants bearing a tetradecyl chain
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DOI：
10.1016/j.colsurfa.2018.05.018
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发表时间：
2018-09-05
影响因子：
5.2
通讯作者：
Biczok, Laszlo
中科院分区：
文献类型：
--
作者：
Miskolczy, Zsombor;Takahashi, Yuki;Biczok, Laszlo
研究了1，3，6，8-芘四磺酸盐（S4 P）和8-羟基芘-1，3，6-三磺酸盐（S3 POH）与十四烷基阳离子表面活性剂在298 K水溶液中的缔合作用。两种类型的纳米颗粒的生产取决于组分的混合比。在低表面活性剂过量下，带负电荷的较大纳米颗粒的自组装总是放热的，而在大量表面活性剂存在下，正纳米颗粒的形成和尺寸减小实际上是热中性的。荧光光谱的改变后，自组织的成分表示p-p之间的相互作用的芘部分内的纳米粒子。在十四烷基三甲基溴化铵溶液中，S4 P不仅诱导形成纳米粒子，而且诱导形成由超分子和常规两亲物组成的混合胶束。当1-甲基-3-十四烷基-咪唑阳离子比S3 POH摩尔过量超过19倍时，实现了纳米颗粒向这种混合胶束的pH响应性熵控制转化。
The association of 1,3,6,8-pyrenetetrasulfonate (S4P) or 8-hydroxypyrene-1,3,6-trisulfonate (S3POH) with cationic surfactants possessing tetradecyl substituent was studied in aqueous solution at 298 K. Two types of nanoparticles were produced depending on the mixing ratio of the components. The self-assembly to negatively charged larger nanoparticles at low surfactant excess was always exothermic, whereas the formation and size diminution of the positive nanoparticles in the presence of larger amount of surfactants were practically thermoneutral. The alteration of the fluorescence spectrum upon self-organization of the constituents indicated p-p interaction between the pyrene moieties within the nanoparticles. In tetradecyltrimethylammonium bromide solution, S4P induced the formation of not only nanoparticles but also mixed micelles composed of supramolecular and conventional amphiphiles. A pH-responsive entropy-controlled transformation of nanoparticles to such mixed micelles was achieved when 1-methyl-3-tetradecyl-imidazolium cation had more than 19-fold molar excess over S3POH.