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首页> 外文期刊>Colloids and Interfaces >Dynamic Properties of Mixed Cationic/Nonionic Adsorbed Layers at the N-Hexane/Water Interface: Capillary Pressure Experiments Under Low Gravity Conditions
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Dynamic Properties of Mixed Cationic/Nonionic Adsorbed Layers at the N-Hexane/Water Interface: Capillary Pressure Experiments Under Low Gravity Conditions

机译：正己烷/水界面上混合的阳离子/非离子吸附层的动态特性：低重力条件下的毛细管压力实验

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摘要

Capillary pressure experiments are performed in microgravity conditions on board the International Space Station to quantify the dynamic interfacial behavior of mixed adsorption layers of TTAB and C13DMPO at the water/hexane interface. While the non-ionic surfactant C13DMPO is soluble in both bulk phases, water and hexane, the cationic surfactant TTAB is only soluble in the aqueous phase. The interfacial layer is thus formed by TTAB molecules adsorbing from the aqueous phase while the C13DMPO molecules adsorb from the aqueous phase, and transfer partially into the hexane phase until both the equilibrium of adsorption and the distribution between the two adjacent liquid phases is established. The experimental constrains as well as all possible influencing parameters, such as interfacial and bulk phase compressibility, interfacial curvature, calibration of pressure and absolute geometry size, are discussed in detail. The experimental results in terms of the dilational interfacial viscoelasticity of the mixed adsorption layers in a wide range of oscillation frequencies show that the existing theoretical background had to be extended in order to consider the effect of transfer of the non-ionic surfactant across the interface, and the curvature of the water/hexane interface. A good qualitative agreement between theory and experiment was obtained, however, for a quantitative comparison, additional accurate information on the adsorption isotherms and diffusion coefficients of the two studied surfactants in water and hexane, alone and in a mixed system, are required.
机译：在国际空间站上的微重力条件下进行了毛细管压力实验，以量化TTAB和C13DMPO混合吸附层在水/己烷界面上的动态界面行为。尽管非离子表面活性剂C13DMPO可溶于本体相，水和己烷中，但阳离子表面活性剂TTAB仅可溶于水相。因此，界面层由TTAB分子从水相中吸收而C13DMPO分子从水相中吸收而形成，并部分转移到己烷相中，直到建立了吸附平衡和两个相邻液相之间的分布。详细讨论了实验约束以及所有可能的影响参数，例如界面和主体相的可压缩性，界面曲率，压力校准和绝对几何尺寸。在广泛的振荡频率范围内，混合吸附层的膨胀界面粘弹性的实验结果表明，必须扩展现有的理论背景，以考虑非离子表面活性剂跨界面转移的影响，以及水/己烷界面的曲率。在理论和实验之间获得了良好的定性一致性，但是，为了进行定量比较，还需要有关单独和在混合系统中两种研究的表面活性剂在水和己烷中的吸附等温线和扩散系数的准确信息。

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