A reverse micellar system with Triton X-100: effect of surfactant polydispersity and preparation of monodisperse silica nanoparticles.,Soft Matter

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A reverse micellar system with Triton X-100: effect of surfactant polydispersity and preparation of monodisperse silica nanoparticles.
Soft Matter ( IF 2.9 ) Pub Date : 2020-01-02 , DOI: 10.1039/c9sm02182e
Yaping Zhang ₁ , Bin Zhen , Yue Hu , Guohong Liang , Yaqing Feng

Affiliation

Reverse micellar systems possess a characteristic nanoscale water-in-oil (w/o) structure and can offer mild conditions as a unique and versatile reaction medium. Reverse microemulsions containing water/TX-100 + hexanol/hexane are studied in this work through experimental techniques and simulation methods. Surfactant dosages and water amount affect the micellar structure profoundly, and the polydispersity of the surfactant molecules affects the micellar structure remarkably. TX-100 with 9-10 EO units can form micelles in a simply piling way, while TX-100 with 5-10 EO units endows the micelles with a hierarchical micellar interface and a more compact structure, leading to monodisperse micelles with a smaller diameter. Water in the polar cores has three states. In the reverse micellar system using TX-100 with 9-10 EO units, hydrolysis of tetraethoxysilane happens rapidly and the formed silica gels are apt to aggregate, resulting in polydisperse silica nanoparticles. For the micellar system using TX-100 with 5-10 EO units, the micellar hierarchical distributed interface facilitates the material exchange of tetraethoxysilane and limits the hydrolysis of tetraethoxysilane inside the micelles, providing monodisperse silica nanoparticles.

中文翻译：

具有Triton X-100的反胶束系统：表面活性剂多分散性的影响和单分散二氧化硅纳米颗粒的制备。

反胶束系统具有特征性的纳米级油包水（w / o）结构，可以提供温和的条件作为独特而通用的反应介质。通过实验技术和模拟方法，研究了含有水/ TX-100 +己醇/己烷的反相微乳液。表面活性剂的用量和水量深刻影响胶束结构，表面活性剂分子的多分散性显着影响胶束结构。具有9-10个EO单元的TX-100可以以简单的堆积方式形成胶束，而具有5-10个EO单元的TX-100使胶束具有分层的胶束界面和更紧凑的结构，从而导致直径较小的单分散胶束。极地核心中的水具有三种状态。在使用具有9-10个EO单元的TX-100的反胶束系统中，四乙氧基硅烷的水解迅速发生，形成的硅胶易于聚集，形成多分散的二氧化硅纳米粒子。对于使用具有5-10个EO单元的TX-100的胶束系统，胶束分层分布界面促进了四乙氧基硅烷的材料交换并限制了胶束内部四乙氧基硅烷的水解，从而提供了单分散的二氧化硅纳米粒子。

更新日期：2020-01-02

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