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Self-assembly of quaternary ammonium gemini surfactants in cyclohexane upon reinforcement by simple counterions

机译：简单抗衡离子加固后环己烷季铵铵铵的自我组装

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摘要

The quaternary ammonium gemini surfactants 12-s-12 (s= 2, 6, and 10) can produce homogeneous cyclohexane solutions with the assistance of salts, sodium benzoate (NaBez), sodium salicylate (NaSal), or sodium 2-bromoethanesulphonate (NaBres). In these samples, 12-s-12/salt formed aggregates and their structures were assigned by SAXS measurements together with POM observations. Among the three salts, both NaBez and NaBres had similar effects on assisting aggregate formation, but NaSal favoured the generation of aggregates of 12-s-12 with lower interface curvature. For example, both 12-2-12/NaBez and 12-2-12/NaBres formed an I-2 liquid crystalline (LC) phase with an Fm3m structure, but 12-2-12/NaSal generated a H-2 LC phase. Both 12-6-12/NaBez and 12-6-12/NaBres generated a H-2 LC phase, while 12-6-12/NaSal yielded both H-2 and V-2 phases with Pn3m symmetry, both of which co-existed in solution. The special effect of NaSal was attributed to its ortho-hydroxyl in the benzene ring. This favoured the formation of intermolecular hydrogen bonds among the NaSal molecules attracted to the quaternary ammonium head of 12-s-12. The water molecules joined between the NaSal molecules to build hydrogen-bonding bridges, which further increased the size of the 12-s-12 head. This benefited the formation of aggregates with lower surface curvature. In the systems of both NaBez and NaBres, the spacer length of the gemini surfactants dominated the morphology of the formed aggregates, wherein the effect of the salt was significantly weaker. Finally, the visco-elasticity of samples with similar aggregates was measured and the rheological behaviour discussed.
机译：季铵铵Gemini表面活性剂12-S-12（S = 2,6和10）可以在盐，苯甲酸钠（Nabez），水杨酸钠（鼻）或2-溴乙烯酸钠（Nabres）的辅助方案中产生均匀的环己烷溶液（Nabres ）。在这些样品中，12-S-12 /盐形成的聚集体及其结构通过萨克斯测量与POM观察分配。在三种盐中，Nabez和Nabres都对辅助聚集体形成具有类似的效果，但鼻腔有助于产生12-S-12的聚集体，具有较低的界面曲率。例如，12-2-12 / Nabez和12-2-12 / Nabres均形成具有FM3M结构的I-2液晶（LC）相，但是12-2-12 /鼻为H-2 LC相。 12-6-12 / Nabez和12-6-12 / Nabres产生H-2 LC相，而12-6-12 /鼻腔均产生H-2和V-2阶段，PN3M对称性，两者 - 在解决方案中。鼻腔的特殊效果归因于其苯环中的邻羟基。这有助于形成吸引到12-S-12的季铵头的鼻分子中的分子间氢键。在鼻部分子之间连接的水分子以构建氢键桥，其进一步增加了12-S-12头的尺寸。这使得具有较低表面曲率的聚集体的形成。在Nabez和Nabres的系统中，Gemini表面活性剂的间隔长度主要占据所形成的聚集体的形态，其中盐的作用显着弱。最后，测量具有相似聚集体的样品的粘弹性并讨论流变行为。

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  • 来源
    《RSC Advances》 |2018年第34期|共9页
  • 作者

    Deng Sheng-lu; Zhao Jian-xi; Wen Zhi-xiu;

  • 作者单位

    Fuzhou Univ Inst Colloid &

    Interface Chem Coll Chem &

    Chem Engn Fuzhou 350108 Fujian Peoples R China;

    Fuzhou Univ Inst Colloid &

    Interface Chem Coll Chem &

    Chem Engn Fuzhou 350108 Fujian Peoples R China;

    Fuzhou Univ Inst Colloid &

    Interface Chem Coll Chem &

    Chem Engn Fuzhou 350108 Fujian Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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