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Molecular interactions and the viscoelasticity of micellar aggregates

机译：胶束聚集体的分子相互作用和粘弹性

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摘要

Intermolecular interactions are responsible for the macroscopic properties of materials. Self-assembled micelles of ionic surfactants in the presence of salt are a result of the balance between hydrophobic-hydrophilic and ionic forces. For example, sodium salicylate (NaSal) undoubtedly offers a powerful means of increasing the viscoelasticity of hexadecyl trimethylammonium bromide (CTAB) solutions by orders of magnitude, which results from the formation of wormlike micelles (WLMs). The efficiency of this additive relies on its ability to integrate and alter the repulsive interactions governing CTAB micelles. Consequently, small modifications in the molecular structure of NaSal influences the nature of these interactions. Nevertheless, the full potential of formulation for tailoring the system's viscoelasticity has yet to be unleashed. Herein, we investigate a series of structurally similar molecules varying in terms of geometry and size. The depth and molecular orientation of their insertion into the micellar core were monitored by proton nuclear magnetic resonance (H-1-NMR) and correlated with the corresponding viscoelastic response. After detailed observation of the impact of molecular interactions on zero-shear viscosity eta(0), we discuss it in terms of the effective packing parameter (PPeff). All the investigated additives increased PPeff, triggering anisotropic micellar growth toward WLMs. The simplicity of our approach is attractive for predicting and controlling the viscoelastic properties of WLM solutions from an intermolecular level. Published under license by AIP Publishing.
机译：分子间相互作用负责材料的宏观性质。在盐的存在下离子表面活性剂的自组装胶束疏水 - 亲水和离子力之间的平衡造成的。例如，水杨酸钠（鼻）无疑提供几个数量级，从蠕虫状胶束（WLMS）的形成，其结果增加的十六烷基三甲基溴化铵（CTAB）溶液的粘弹性的有力手段。这种添加剂的效率依赖于它的集成和改变管理CTAB胶束的排斥作用的能力。因此，在鼻的分子结构小的修改影响这些相互作用的性质。然而，配方用于定制系统的粘弹性的全部潜力仍有待释放。在此，我们研究了一系列结构相似的分子几何形状和尺寸方面变化的。的深度和它们的插入的分子取向成胶束芯通过质子核磁共振（H-1-NMR）监测并与相应的粘弹性响应相关。的分子间的相互作用对零剪切粘度〔η（0）的影响的详细观察后，我们在有效堆积参数（PPeff）方面进行讨论。所有研究的添加剂增加PPeff，触发朝向WLMS各向异性胶束增长。我们的方法的简单性是从分子水平预测和控制解决方案WLM的粘弹特性的吸引力。通过AIP发布在许可证下发布。

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  • 来源
    《Physics of fluids》 |2019年第8期|共10页
  • 作者

    Walker Franziska; Isabettini Stephane; Kuster Simon; Fischer Peter; Lutz-Bueno Viviane;

  • 作者单位

    Swiss Fed Inst Technol Inst Food Nutr &

    Hlth CH-8092 Zurich Switzerland;

    Swiss Fed Inst Technol Inst Food Nutr &

    Hlth CH-8092 Zurich Switzerland;

    Swiss Fed Inst Technol Inst Food Nutr &

    Hlth CH-8092 Zurich Switzerland;

    Swiss Fed Inst Technol Inst Food Nutr &

    Hlth CH-8092 Zurich Switzerland;

    Swiss Fed Inst Technol Inst Food Nutr &

    Hlth CH-8092 Zurich Switzerland;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 流体力学;
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