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Aggregate-based sub-CMC solubilization of hexadecane by surfactants

机译：表面活性剂的基于聚集的亚CMC溶解

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Solubilizaiton of hexadecane by two surfactants, SDBS and Triton X-100, at concentrations near the critical micelle concentration (CMC) and the related aggregation behavior was investigated in this study. Solubilization was observed at surfactant concentrations lower than CMC, and the apparent solubility of hexadecane increased linearly with surfactant concentration for both surfactants. The capacity of SDBS to solubilize hexadecane is stronger at concentrations below CMC than above CMC. In contrast, Triton X-100 shows no difference. The results of dynamic light scattering (DLS) and cryogenic TEM analysis show aggregate formation at surfactant concentrations lower than CMC. DLS-based size of the aggregates (d) decreases with increasing surfactant concentration. The zeta potential of the SDBS aggregates decreases with increasing SDBS concentration, whereas it increases for Triton X-100. The surface excess (Gamma) of SDBS calculated based on hexadecane solubility and aggregate size data increases rapidly with increasing bulk concentration, and then asymptotically approaches the maximum surface excess (Gamma(max)). Conversely, there is only a minor increase in G for Triton X-100. Comparison of G and d indicates that an excess of surfactant molecules at the aggregate surface has a great impact on surface curvature. The results of this study demonstrate the formation of aggregates at surfactant concentrations below CMC for hexadecane solubilization, and indicate the potential of employing a low-concentration strategy for surfactant applications such as remediation of HOC contaminated sites.
机译：在本研究中研究了在临界胶束浓度（CMC）附近的两个表面活性剂，SDBS和TRITON X-100的二十六烷酮，SDBS和TRITON X-100和相关聚集行为的溶剂。在低于CMC的表面活性剂浓度下观察到溶解，并且十六烷的表观溶解度随着两个表面活性剂的表面活性剂浓度而导致线性增加。 SDBs溶解十六烷的能力在CMC低于CMC以下的浓度较强。相比之下，Triton X-100没有显示出差异。动态光散射（DLS）和低温TEM分析的结果表明，表面活性剂浓度低于CMC的聚集体形成。基于DLS的聚集体（d）的尺寸随着表面活性剂浓度的增加而降低。 SDBS聚集体的ζ电位随着SDBS浓度的增加而降低，而TRITON X-100增加。基于十六甲烷溶解度和聚集尺寸数据计算的SDB的表面过量（γ）随着体积浓度的增加而迅速增加，然后渐近地接近最大表面过量（伽马（最大））。相反，对于TRITON X-100，G只有轻微增加。 G和D的比较表明聚集表面上过量的表面活性剂分子对表面曲率产生了很大的影响。该研究的结果证明了表面活性剂浓度在CMC下进行的聚集体，用于十六烷溶解，并表明使用低浓度策略的表面活性剂应用，例如Hoc污染的位点的修复。

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  • 来源
    《RSC Advances》 |2015年第95期|共8页
  • 作者

    Zhong Hua; Yang Lei; Zeng Guangming; Brusseau Mark L.; Wang Yake; Li Yang; Liu Zhifeng; Yuan Xingzhong; Tan Fei;

  • 作者单位

    Hunan Univ Coll Environm Sci &

    Engn Changsha 410082 Hunan Peoples R China;

    Hunan Univ Coll Environm Sci &

    Engn Changsha 410082 Hunan Peoples R China;

    Hunan Univ Coll Environm Sci &

    Engn Changsha 410082 Hunan Peoples R China;

    Univ Arizona Dept Soil Water &

    Environm Sci Tucson AZ 85721 USA;

    Univ Arizona Dept Soil Water &

    Environm Sci Tucson AZ 85721 USA;

    Univ Sci &

    Technol China Dept Chem Hefei 230026 Peoples R China;

    Hunan Univ Coll Environm Sci &

    Engn Changsha 410082 Hunan Peoples R China;

    Hunan Univ Coll Environm Sci &

    Engn Changsha 410082 Hunan Peoples R China;

    Hunan Univ Coll Environm Sci &

    Engn Changsha 410082 Hunan Peoples R China;

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  • 中图分类 化学;
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