Gemini surfactant behavior of conventional surfactant dodecyltrimethylammonium bromide with anionic azo dye Sunset Yellow in aqueous solutions
Gemini surfactant behavior of conventional surfactant dodecyltrimethylammonium bromide with anionic azo dye Sunset Yellow in aqueous solutions
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DOI：
10.1016/j.molliq.2022.119556
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发表时间：
2022-06
影响因子：
6
通讯作者：
E. Akpinar;Nazli Uygur;Gokhan Topcu;O. Lavrentovich;Antônio Martins Figueiredo Neto
中科院分区：
文献类型：
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作者：
E. Akpinar;Nazli Uygur;Gokhan Topcu;O. Lavrentovich;Antônio Martins Figueiredo Neto
在这项研究中，阴离子偶氮染料日落黄与传统的阳离子表面活性剂十二烷基三甲基溴化铵（DTMABr）的相互作用已被检查作为染料浓度的函数在25 ° C下通过电导率和UV-VIS光谱测量。Carpena的方法，结合Aguiar的方法，用于分析电导率数据，从电导率-表面活性剂浓度曲线中评估胶束化参数，如临界胶束浓度（cmc），反离子结合度（β）和胶束化吉布斯自由能（Δ micG）。进行UV-VIS吸收光谱测量以获得关于日落黄在水中的堆积性质的染料浓度依赖性的信息。结果表明，虽然DTMABr是一种具有单烷基链的常规表面活性剂，但由于表面活性剂-染料相互作用，其在相对高的染料浓度下显示出双子表面活性剂行为。据我们所知，这是第一个研究表明，双子表面活性剂的DTMABr的行为，在SSY和J-聚集的SSY在高SSY浓度的DTMABr的存在下，在SSY的存在下。此外，在DTMABr的存在下，SSY分子在低浓度下形成H-聚集体;它们在高浓度下显示J-聚集体。
In this study, the interaction of an anionic azo dye Sunset Yellow with conventional cationic surfactant dodecyltrimethylammonium bromide (DTMABr) has been examined as a function of the dye concentration at 25 °C by electrical conductivity and UV–VIS spectroscopy measurements. Carpena’s method, combined with Aguiar’s approach, was applied to the analysis of the conductivity data for evaluating the micellization parameters such as critical micelle concentrations (cmc), degree of counterion bindings (β), and micellization Gibbs free energies (ΔmicG) from the specific conductivity-surfactant concentration curves. The UV–VIS absorption spectroscopy measurements were performed to obtain information on the dye concentration dependence of the stacking properties of Sunset Yellow in water. The results indicated that although DTMABr is a conventional surfactant with a single alkyl chain, it shows gemini surfactant behavior at relatively high dye concentrations as a result of the surfactant-dye interactions. To the best of our knowledge, this is the first study that shows both the gemini surfactant behavior of DTMABr in the presence of SSY and J-aggregations of SSY at high SSY concentrations in the presence of DTMABr. Furthermore, in the presence of DTMABr, the SSY molecules at low concentrations form H-aggregates; they show J-aggregation at high concentrations.