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arXiv 1603.02168cond-mat.softcond-mat.mes-hallphysics.chem-ph
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阴离子和非离子表面活性剂在SiO $_{2}$(二氧化硅)/水界面上行为的计算研究

Computational studies on the behaviour of anionic and nonionic surfactants at the SiO$_{2}$ (silicon dioxide)/water interface

E. Núñez-Rojas, H. Dominguez

摘要:

进行了分子动力学模拟,以研究接近SiO $_{2}$(二氧化硅)表面的阴离子(十二烷基硫酸钠,SDS)和非离子(脱水山梨醇单油酸酯,SPAN 80)表面活性剂的行为。模拟结果表明,水层首先吸附在表面上,然后表面活性剂附着在该层。此外,据观察,靠近表面的水的行为影响表面活性剂的吸附,因为在SiO $_{2}$表面上与SDS分子形成半球形胶束,而与SPAN 80分子形成圆柱形胶束。胶束的吸附进行的结构特性(密度分布和角分布)和动力学行为(扩散系数)的系统。最后,它也表明,一些水分子内部移动的固体表面,并位于特定的网站的固体表面。

英文摘要:

Molecular dynamics simulations to study the behaviour of anionic (Sodium Dodecylsulfate, SDS) and nonionic (Monooleate of Sorbitan, SPAN80) surfactants close to a SiO$_{2}$ (silicon dioxide) surface were carried out. Simulations showed that a water layer was first adsorbed on the surface and then the surfactants were attached on that layer. Moreover, it was observed that water behaviour close to the surface influenced the surfactant adsorption since a semi-spherical micelle was formed on the SiO$_{2}$ surface with SDS molecules whereas a cylindrical micelle was formed with SPAN80 molecules. Adsorption of the micelles was conducted in terms of structural properties (density profiles and angular distributions) and dynamical behaviour (diffusion coefficients) of the systems. Finally, it was also shown that some water molecules moved inside the solid surface and located at specific sites of the solid surface.

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