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首页> 外文会议>International Conference on Surface and Colloid Science; 200309; Brazil >Incorporation and differential reactivity of anions in zwitterionic sulfobetaine micelles
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Incorporation and differential reactivity of anions in zwitterionic sulfobetaine micelles

机译：两性离子磺基甜菜碱胶束中阴离子的掺入和差异反应性

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Zwitterionic surfactants, such as sulfobetaines and carboxyb-etaines, are formally neutral, but their micelles incorporate anions owing to the higher charge density of the cationic ammonium inner surface, compared with that of the anionic sulfonate, or carboxylate, surface and to anion-specific interactions. In this work, we used the following sulfobetaines: N-decyl-, N-tetradecyl- and N-hexadecyl-N, N-dimethylammonio-1-propanesulf-onate, N-tetradecyl-N,N-diethyl-, N-tetradecyl-N,N-dipropyl- and N-tetradecyl-N,N-dibutylammonio-1-propanesulfonate and N-tetrade-cyl-N,N-dimethyl-, N-tetradecyl-N,N-diethyl- and N-tetradecyl-N, N-dipropylammonio-1-butanesulfo-nate. We have determined the partitioning of bromide and perchlorate ions between water and micelles in terms of anions incorporated in the interfacial region of the micelles as a function of concentrations of added ions in the bulk solution. The concentrations of free and micellar-bound ions were determined by using ion-selective electrodes, in the presence and absence of sulfobetaines, at pH 9.0 (borate buffer). The incorporation of anions into zwitterionic micelles fits Langmuir adsorption isotherms, and the results are related to changes in the micellar surface potential. The incorporation of perchlorate is in the range 15-30% of the concentration of micellized surfactant for the different sulfobetaines, and is greater than that for bromide ion (about 10%). These results fit differences in anionic reactivities and in the NMR line widths of micellar incorporated anions.
机译：两性离子表面活性剂，例如磺基甜菜碱和羧基-牛磺酸，在形式上是中性的，但由于与阳离子磺酸盐或羧酸盐相比，阳离子铵内表面的电荷密度较高，且与阴离子特异性表面活性剂相比，它们的胶束中含有阴离子。互动。在这项工作中，我们使用了以下磺基甜菜碱：N-癸基-，N-十四烷基-和N-十六烷基-N，N-二甲基氨-1-丙烷磺酸盐，N-十四烷基-N，N-二乙基-，N-十四烷基-N，N-二丙基-和N-十四烷基-N，N-二丁基铵-1-丙烷磺酸盐和N-十四烷基-N，N-二甲基-，N-十四烷基-N，N-二乙基-和N-十四烷基- N，N-二丙基氨基-1-丁烷磺酸磺酸盐。我们已经确定了溴化物和高氯酸根离子在水和胶束之间的分配，取决于在胶束界面区域掺入的阴离子与本体溶液中添加离子浓度的关系。在存在和不存在磺基甜菜碱的条件下，在pH 9.0（硼酸盐缓冲液）下，使用离子选择电极测定游离离子和胶束结合离子的浓度。将阴离子引入两性离子胶束中符合Langmuir吸附等温线，其结果与胶束表面电势的变化有关。对于不同的磺基甜菜碱，高氯酸盐的掺入量为胶束化表面活性剂浓度的15-30％，并且大于溴离子的掺入量（约10％）。这些结果拟合了胶束结合的阴离子的阴离子反应性和NMR线宽的差异。

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